Re: [PATCH v3] media/*: Convert from tasklet to BH workqueue

From: Hans Verkuil
Date: Thu May 30 2024 - 07:45:06 EST

Hi Allen,

Some review comments:

Regarding the Subject: instead of 'media/*:' just write 'media:'.

On 25/04/2024 20:31, Allen Pais wrote:
> The only generic interface to execute asynchronously in the BH context is
> tasklet; however, it's marked deprecated and has some design flaws. To
> replace tasklets, BH workqueue support was recently added. A BH workqueue
> behaves similarly to regular workqueues except that the queued work items
> are executed in the BH context.
>
> This patch converts drivers/media/* from tasklet to BH workqueue.
>
> Based on the work done by Tejun Heo <tj@xxxxxxxxxx>
> Branch: https://git.kernel.org/pub/scm/linux/kernel/git/tj/wq.git for-6.10
>
> Signed-off-by: Allen Pais <allen.lkml@xxxxxxxxx>
> ---
> drivers/media/pci/bt8xx/bt878.c | 8 ++--
> drivers/media/pci/bt8xx/bt878.h | 3 +-
> drivers/media/pci/bt8xx/dvb-bt8xx.c | 9 ++--
> drivers/media/pci/ddbridge/ddbridge.h | 2 +-
> drivers/media/pci/mantis/hopper_cards.c | 2 +-
> drivers/media/pci/mantis/mantis_cards.c | 2 +-
> drivers/media/pci/mantis/mantis_common.h | 2 +-
> drivers/media/pci/mantis/mantis_dma.c | 5 ++-
> drivers/media/pci/mantis/mantis_dma.h | 2 +-
> drivers/media/pci/mantis/mantis_dvb.c | 12 +++---
> drivers/media/pci/ngene/ngene-core.c | 23 ++++++-----
> drivers/media/pci/ngene/ngene.h | 5 ++-
> drivers/media/pci/smipcie/smipcie-main.c | 18 ++++----
> drivers/media/pci/smipcie/smipcie.h | 3 +-
> drivers/media/pci/ttpci/budget-av.c | 3 +-
> drivers/media/pci/ttpci/budget-ci.c | 27 ++++++------
> drivers/media/pci/ttpci/budget-core.c | 10 ++---
> drivers/media/pci/ttpci/budget.h | 5 ++-
> drivers/media/pci/tw5864/tw5864-core.c | 2 +-
> drivers/media/pci/tw5864/tw5864-video.c | 13 +++---
> drivers/media/pci/tw5864/tw5864.h | 7 ++--
> drivers/media/platform/intel/pxa_camera.c | 15 +++----
> drivers/media/platform/marvell/mcam-core.c | 11 ++---
> drivers/media/platform/marvell/mcam-core.h | 3 +-
> .../st/sti/c8sectpfe/c8sectpfe-core.c | 15 +++----
> .../st/sti/c8sectpfe/c8sectpfe-core.h | 2 +-
> drivers/media/radio/wl128x/fmdrv.h | 7 ++--
> drivers/media/radio/wl128x/fmdrv_common.c | 41 ++++++++++---------
> drivers/media/rc/mceusb.c | 2 +-
> drivers/media/usb/ttusb-dec/ttusb_dec.c | 21 +++++-----
> 30 files changed, 149 insertions(+), 131 deletions(-)
>
> diff --git a/drivers/media/pci/bt8xx/bt878.c b/drivers/media/pci/bt8xx/bt878.c
> index 90972d6952f1..ec780e037bee 100644
> --- a/drivers/media/pci/bt8xx/bt878.c
> +++ b/drivers/media/pci/bt8xx/bt878.c
> @@ -300,8 +300,8 @@ static irqreturn_t bt878_irq(int irq, void *dev_id)
> }
> if (astat & BT878_ARISCI) {
> bt->finished_block = (stat & BT878_ARISCS) >> 28;
> - if (bt->tasklet.callback)
> - tasklet_schedule(&bt->tasklet);
> + if (bt->work.func)
> + queue_work(system_bh_wq, &bt->work);

I would prefer that 'work' is renamed to 'bh_work'. That way it is easy
to identify it as part of system_bh_wq. This is true for the other
drivers in this patch as well, so I won't repeat this.

> break;
> }
> count++;
> @@ -478,8 +478,8 @@ static int bt878_probe(struct pci_dev *dev, const struct pci_device_id *pci_id)
> btwrite(0, BT878_AINT_MASK);
> bt878_num++;
>
> - if (!bt->tasklet.func)
> - tasklet_disable(&bt->tasklet);
> + if (!bt->work.func)
> + disable_work_sync(&bt->work);
>
> return 0;
>
> diff --git a/drivers/media/pci/bt8xx/bt878.h b/drivers/media/pci/bt8xx/bt878.h
> index fde8db293c54..b9ce78e5116b 100644
> --- a/drivers/media/pci/bt8xx/bt878.h
> +++ b/drivers/media/pci/bt8xx/bt878.h
> @@ -14,6 +14,7 @@
> #include <linux/sched.h>
> #include <linux/spinlock.h>
> #include <linux/mutex.h>
> +#include <linux/workqueue.h>
>
> #include "bt848.h"
> #include "bttv.h"
> @@ -120,7 +121,7 @@ struct bt878 {
> dma_addr_t risc_dma;
> u32 risc_pos;
>
> - struct tasklet_struct tasklet;
> + struct work_struct work;
> int shutdown;
> };
>
> diff --git a/drivers/media/pci/bt8xx/dvb-bt8xx.c b/drivers/media/pci/bt8xx/dvb-bt8xx.c
> index 390cbba6c065..8c0e1fa764a4 100644
> --- a/drivers/media/pci/bt8xx/dvb-bt8xx.c
> +++ b/drivers/media/pci/bt8xx/dvb-bt8xx.c
> @@ -15,6 +15,7 @@
> #include <linux/delay.h>
> #include <linux/slab.h>
> #include <linux/i2c.h>
> +#include <linux/workqueue.h>
>
> #include <media/dmxdev.h>
> #include <media/dvbdev.h>
> @@ -39,9 +40,9 @@ DVB_DEFINE_MOD_OPT_ADAPTER_NR(adapter_nr);
>
> #define IF_FREQUENCYx6 217 /* 6 * 36.16666666667MHz */
>
> -static void dvb_bt8xx_task(struct tasklet_struct *t)
> +static void dvb_bt8xx_task(struct work_struct *t)

I'd rename _task to _work.

> {
> - struct bt878 *bt = from_tasklet(bt, t, tasklet);
> + struct bt878 *bt = from_work(bt, t, work);
> struct dvb_bt8xx_card *card = dev_get_drvdata(&bt->adapter->dev);
>
> dprintk("%d\n", card->bt->finished_block);
> @@ -782,7 +783,7 @@ static int dvb_bt8xx_load_card(struct dvb_bt8xx_card *card, u32 type)
> goto err_disconnect_frontend;
> }
>
> - tasklet_setup(&card->bt->tasklet, dvb_bt8xx_task);
> + INIT_WORK(&card->bt->work, dvb_bt8xx_task);
>
> frontend_init(card, type);
>
> @@ -922,7 +923,7 @@ static void dvb_bt8xx_remove(struct bttv_sub_device *sub)
> dprintk("dvb_bt8xx: unloading card%d\n", card->bttv_nr);
>
> bt878_stop(card->bt);
> - tasklet_kill(&card->bt->tasklet);
> + cancel_work_sync(&card->bt->work);
> dvb_net_release(&card->dvbnet);
> card->demux.dmx.remove_frontend(&card->demux.dmx, &card->fe_mem);
> card->demux.dmx.remove_frontend(&card->demux.dmx, &card->fe_hw);
> diff --git a/drivers/media/pci/ddbridge/ddbridge.h b/drivers/media/pci/ddbridge/ddbridge.h
> index f3699dbd193f..6044f3085fad 100644
> --- a/drivers/media/pci/ddbridge/ddbridge.h
> +++ b/drivers/media/pci/ddbridge/ddbridge.h
> @@ -298,7 +298,7 @@ struct ddb_link {
> spinlock_t lock; /* lock link access */
> struct mutex flash_mutex; /* lock flash access */
> struct ddb_lnb lnb;
> - struct tasklet_struct tasklet;
> + struct work_struct work;

Please keep the alignment so 'work' aligns with the other fields.

> struct ddb_ids ids;
>
> spinlock_t temp_lock; /* lock temp chip access */
> diff --git a/drivers/media/pci/mantis/hopper_cards.c b/drivers/media/pci/mantis/hopper_cards.c
> index c0bd5d7e148b..869ea88c4893 100644
> --- a/drivers/media/pci/mantis/hopper_cards.c
> +++ b/drivers/media/pci/mantis/hopper_cards.c
> @@ -116,7 +116,7 @@ static irqreturn_t hopper_irq_handler(int irq, void *dev_id)
> if (stat & MANTIS_INT_RISCI) {
> dprintk(MANTIS_DEBUG, 0, "<%s>", label[8]);
> mantis->busy_block = (stat & MANTIS_INT_RISCSTAT) >> 28;
> - tasklet_schedule(&mantis->tasklet);
> + queue_work(system_bh_wq, &mantis->work);
> }
> if (stat & MANTIS_INT_I2CDONE) {
> dprintk(MANTIS_DEBUG, 0, "<%s>", label[9]);
> diff --git a/drivers/media/pci/mantis/mantis_cards.c b/drivers/media/pci/mantis/mantis_cards.c
> index 906e4500d87d..cb124b19e36e 100644
> --- a/drivers/media/pci/mantis/mantis_cards.c
> +++ b/drivers/media/pci/mantis/mantis_cards.c
> @@ -125,7 +125,7 @@ static irqreturn_t mantis_irq_handler(int irq, void *dev_id)
> if (stat & MANTIS_INT_RISCI) {
> dprintk(MANTIS_DEBUG, 0, "<%s>", label[8]);
> mantis->busy_block = (stat & MANTIS_INT_RISCSTAT) >> 28;
> - tasklet_schedule(&mantis->tasklet);
> + queue_work(system_bh_wq, &mantis->work);
> }
> if (stat & MANTIS_INT_I2CDONE) {
> dprintk(MANTIS_DEBUG, 0, "<%s>", label[9]);
> diff --git a/drivers/media/pci/mantis/mantis_common.h b/drivers/media/pci/mantis/mantis_common.h
> index d88ac280226c..cf4b604b55f5 100644
> --- a/drivers/media/pci/mantis/mantis_common.h
> +++ b/drivers/media/pci/mantis/mantis_common.h
> @@ -125,7 +125,7 @@ struct mantis_pci {
> __le32 *risc_cpu;
> dma_addr_t risc_dma;
>
> - struct tasklet_struct tasklet;
> + struct work_struct work;
> spinlock_t intmask_lock;
>
> struct i2c_adapter adapter;
> diff --git a/drivers/media/pci/mantis/mantis_dma.c b/drivers/media/pci/mantis/mantis_dma.c
> index 80c843936493..c85f9b84a2c6 100644
> --- a/drivers/media/pci/mantis/mantis_dma.c
> +++ b/drivers/media/pci/mantis/mantis_dma.c
> @@ -15,6 +15,7 @@
> #include <linux/signal.h>
> #include <linux/sched.h>
> #include <linux/interrupt.h>
> +#include <linux/workqueue.h>
>
> #include <media/dmxdev.h>
> #include <media/dvbdev.h>
> @@ -200,9 +201,9 @@ void mantis_dma_stop(struct mantis_pci *mantis)
> }
>
>
> -void mantis_dma_xfer(struct tasklet_struct *t)
> +void mantis_dma_xfer(struct work_struct *t)
> {
> - struct mantis_pci *mantis = from_tasklet(mantis, t, tasklet);
> + struct mantis_pci *mantis = from_work(mantis, t, work);
> struct mantis_hwconfig *config = mantis->hwconfig;
>
> while (mantis->last_block != mantis->busy_block) {
> diff --git a/drivers/media/pci/mantis/mantis_dma.h b/drivers/media/pci/mantis/mantis_dma.h
> index 37da982c9c29..5db0d3728f15 100644
> --- a/drivers/media/pci/mantis/mantis_dma.h
> +++ b/drivers/media/pci/mantis/mantis_dma.h
> @@ -13,6 +13,6 @@ extern int mantis_dma_init(struct mantis_pci *mantis);
> extern int mantis_dma_exit(struct mantis_pci *mantis);
> extern void mantis_dma_start(struct mantis_pci *mantis);
> extern void mantis_dma_stop(struct mantis_pci *mantis);
> -extern void mantis_dma_xfer(struct tasklet_struct *t);
> +extern void mantis_dma_xfer(struct work_struct *t);
>
> #endif /* __MANTIS_DMA_H */
> diff --git a/drivers/media/pci/mantis/mantis_dvb.c b/drivers/media/pci/mantis/mantis_dvb.c
> index c7ba4a76e608..f640635de170 100644
> --- a/drivers/media/pci/mantis/mantis_dvb.c
> +++ b/drivers/media/pci/mantis/mantis_dvb.c
> @@ -105,7 +105,7 @@ static int mantis_dvb_start_feed(struct dvb_demux_feed *dvbdmxfeed)
> if (mantis->feeds == 1) {
> dprintk(MANTIS_DEBUG, 1, "mantis start feed & dma");
> mantis_dma_start(mantis);
> - tasklet_enable(&mantis->tasklet);
> + enable_and_queue_work(system_bh_wq, &mantis->work);
> }
>
> return mantis->feeds;
> @@ -125,7 +125,7 @@ static int mantis_dvb_stop_feed(struct dvb_demux_feed *dvbdmxfeed)
> mantis->feeds--;
> if (mantis->feeds == 0) {
> dprintk(MANTIS_DEBUG, 1, "mantis stop feed and dma");
> - tasklet_disable(&mantis->tasklet);
> + disable_work_sync(&mantis->work);
> mantis_dma_stop(mantis);
> }
>
> @@ -205,8 +205,8 @@ int mantis_dvb_init(struct mantis_pci *mantis)
> }
>
> dvb_net_init(&mantis->dvb_adapter, &mantis->dvbnet, &mantis->demux.dmx);
> - tasklet_setup(&mantis->tasklet, mantis_dma_xfer);
> - tasklet_disable(&mantis->tasklet);
> + INIT_WORK(&mantis->bh, mantis_dma_xfer);

This fails to compile: mantis->bh -> mantis->work

> + disable_work_sync(&mantis->work);
> if (mantis->hwconfig) {
> result = config->frontend_init(mantis, mantis->fe);
> if (result < 0) {
> @@ -235,7 +235,7 @@ int mantis_dvb_init(struct mantis_pci *mantis)
>
> /* Error conditions .. */
> err5:
> - tasklet_kill(&mantis->tasklet);
> + cancel_work_sync(&mantis->work);
> dvb_net_release(&mantis->dvbnet);
> if (mantis->fe) {
> dvb_unregister_frontend(mantis->fe);
> @@ -273,7 +273,7 @@ int mantis_dvb_exit(struct mantis_pci *mantis)
> dvb_frontend_detach(mantis->fe);
> }
>
> - tasklet_kill(&mantis->tasklet);
> + cancel_work_sync(&mantis->work);
> dvb_net_release(&mantis->dvbnet);
>
> mantis->demux.dmx.remove_frontend(&mantis->demux.dmx, &mantis->fe_mem);
> diff --git a/drivers/media/pci/ngene/ngene-core.c b/drivers/media/pci/ngene/ngene-core.c
> index 7481f553f959..5211d6796748 100644
> --- a/drivers/media/pci/ngene/ngene-core.c
> +++ b/drivers/media/pci/ngene/ngene-core.c
> @@ -21,6 +21,7 @@
> #include <linux/byteorder/generic.h>
> #include <linux/firmware.h>
> #include <linux/vmalloc.h>
> +#include <linux/workqueue.h>
>
> #include "ngene.h"
>
> @@ -50,9 +51,9 @@ DVB_DEFINE_MOD_OPT_ADAPTER_NR(adapter_nr);
> /* nGene interrupt handler **************************************************/
> /****************************************************************************/
>
> -static void event_tasklet(struct tasklet_struct *t)
> +static void event_work(struct work_struct *t)
> {
> - struct ngene *dev = from_tasklet(dev, t, event_tasklet);
> + struct ngene *dev = from_work(dev, t, event_work);

So this becomes event_bh_work...

>
> while (dev->EventQueueReadIndex != dev->EventQueueWriteIndex) {
> struct EVENT_BUFFER Event =
> @@ -68,9 +69,9 @@ static void event_tasklet(struct tasklet_struct *t)
> }
> }
>
> -static void demux_tasklet(struct tasklet_struct *t)
> +static void demux_work(struct work_struct *t)
> {
> - struct ngene_channel *chan = from_tasklet(chan, t, demux_tasklet);
> + struct ngene_channel *chan = from_work(chan, t, demux_work);

..amd this demux_bh_work, etc.

> struct device *pdev = &chan->dev->pci_dev->dev;
> struct SBufferHeader *Cur = chan->nextBuffer;
>
> @@ -204,7 +205,7 @@ static irqreturn_t irq_handler(int irq, void *dev_id)
> dev->EventQueueOverflowFlag = 1;
> }
> dev->EventBuffer->EventStatus &= ~0x80;
> - tasklet_schedule(&dev->event_tasklet);
> + queue_work(system_bh_wq, &dev->event_work);
> rc = IRQ_HANDLED;
> }
>
> @@ -217,8 +218,8 @@ static irqreturn_t irq_handler(int irq, void *dev_id)
> ngeneBuffer.SR.Flags & 0xC0) == 0x80) {
> dev->channel[i].nextBuffer->
> ngeneBuffer.SR.Flags |= 0x40;
> - tasklet_schedule(
> - &dev->channel[i].demux_tasklet);
> + queue_work(system_bh_wq,
> + &dev->channel[i].demux_work);
> rc = IRQ_HANDLED;
> }
> }
> @@ -1181,7 +1182,7 @@ static void ngene_init(struct ngene *dev)
> struct device *pdev = &dev->pci_dev->dev;
> int i;
>
> - tasklet_setup(&dev->event_tasklet, event_tasklet);
> + INIT_WORK(&dev->event_work, event_work);
>
> memset_io(dev->iomem + 0xc000, 0x00, 0x220);
> memset_io(dev->iomem + 0xc400, 0x00, 0x100);
> @@ -1395,7 +1396,7 @@ static void release_channel(struct ngene_channel *chan)
> if (chan->running)
> set_transfer(chan, 0);
>
> - tasklet_kill(&chan->demux_tasklet);
> + cancel_work_sync(&chan->demux_work);
>
> if (chan->ci_dev) {
> dvb_unregister_device(chan->ci_dev);
> @@ -1445,7 +1446,7 @@ static int init_channel(struct ngene_channel *chan)
> struct ngene_info *ni = dev->card_info;
> int io = ni->io_type[nr];
>
> - tasklet_setup(&chan->demux_tasklet, demux_tasklet);
> + INIT_WORK(&chan->demux_work, demux_work);
> chan->users = 0;
> chan->type = io;
> chan->mode = chan->type; /* for now only one mode */
> @@ -1647,7 +1648,7 @@ void ngene_remove(struct pci_dev *pdev)
> struct ngene *dev = pci_get_drvdata(pdev);
> int i;
>
> - tasklet_kill(&dev->event_tasklet);
> + cancel_work_sync(&dev->event_work);
> for (i = MAX_STREAM - 1; i >= 0; i--)
> release_channel(&dev->channel[i]);
> if (dev->ci.en)
> diff --git a/drivers/media/pci/ngene/ngene.h b/drivers/media/pci/ngene/ngene.h
> index d1d7da84cd9d..c2a23f6dbe09 100644
> --- a/drivers/media/pci/ngene/ngene.h
> +++ b/drivers/media/pci/ngene/ngene.h
> @@ -16,6 +16,7 @@
> #include <linux/scatterlist.h>
>
> #include <linux/dvb/frontend.h>
> +#include <linux/workqueue.h>
>
> #include <media/dmxdev.h>
> #include <media/dvbdev.h>
> @@ -621,7 +622,7 @@ struct ngene_channel {
> int users;
> struct video_device *v4l_dev;
> struct dvb_device *ci_dev;
> - struct tasklet_struct demux_tasklet;
> + struct work_struct demux_work;

Alignment

>
> struct SBufferHeader *nextBuffer;
> enum KSSTATE State;
> @@ -717,7 +718,7 @@ struct ngene {
> struct EVENT_BUFFER EventQueue[EVENT_QUEUE_SIZE];
> int EventQueueOverflowCount;
> int EventQueueOverflowFlag;
> - struct tasklet_struct event_tasklet;
> + struct work_struct event_work;

Alignment. Please check this patch for other cases.

> struct EVENT_BUFFER *EventBuffer;
> int EventQueueWriteIndex;
> int EventQueueReadIndex;
> diff --git a/drivers/media/pci/smipcie/smipcie-main.c b/drivers/media/pci/smipcie/smipcie-main.c
> index 0c300d019d9c..7da6bb55660b 100644
> --- a/drivers/media/pci/smipcie/smipcie-main.c
> +++ b/drivers/media/pci/smipcie/smipcie-main.c
> @@ -279,10 +279,10 @@ static void smi_port_clearInterrupt(struct smi_port *port)
> (port->_dmaInterruptCH0 | port->_dmaInterruptCH1));
> }
>
> -/* tasklet handler: DMA data to dmx.*/
> -static void smi_dma_xfer(struct tasklet_struct *t)
> +/* work handler: DMA data to dmx.*/
> +static void smi_dma_xfer(struct work_struct *t)
> {
> - struct smi_port *port = from_tasklet(port, t, tasklet);
> + struct smi_port *port = from_work(port, t, work);
> struct smi_dev *dev = port->dev;
> u32 intr_status, finishedData, dmaManagement;
> u8 dmaChan0State, dmaChan1State;
> @@ -426,8 +426,8 @@ static int smi_port_init(struct smi_port *port, int dmaChanUsed)
> }
>
> smi_port_disableInterrupt(port);
> - tasklet_setup(&port->tasklet, smi_dma_xfer);
> - tasklet_disable(&port->tasklet);
> + INIT_WORK(&port->work, smi_dma_xfer);
> + disable_work_sync(&port->work);
> port->enable = 1;
> return 0;
> err:
> @@ -438,7 +438,7 @@ static int smi_port_init(struct smi_port *port, int dmaChanUsed)
> static void smi_port_exit(struct smi_port *port)
> {
> smi_port_disableInterrupt(port);
> - tasklet_kill(&port->tasklet);
> + cancel_work_sync(&port->work);
> smi_port_dma_free(port);
> port->enable = 0;
> }
> @@ -452,7 +452,7 @@ static int smi_port_irq(struct smi_port *port, u32 int_status)
> smi_port_disableInterrupt(port);
> port->_int_status = int_status;
> smi_port_clearInterrupt(port);
> - tasklet_schedule(&port->tasklet);
> + queue_work(system_bh_wq, &port->work);
> handled = 1;
> }
> return handled;
> @@ -823,7 +823,7 @@ static int smi_start_feed(struct dvb_demux_feed *dvbdmxfeed)
> smi_port_clearInterrupt(port);
> smi_port_enableInterrupt(port);
> smi_write(port->DMA_MANAGEMENT, dmaManagement);
> - tasklet_enable(&port->tasklet);
> + enable_and_queue_work(system_bh_wq, &port->work);
> }
> return port->users;
> }
> @@ -837,7 +837,7 @@ static int smi_stop_feed(struct dvb_demux_feed *dvbdmxfeed)
> if (--port->users)
> return port->users;
>
> - tasklet_disable(&port->tasklet);
> + disable_work_sync(&port->work);
> smi_port_disableInterrupt(port);
> smi_clear(port->DMA_MANAGEMENT, 0x30003);
> return 0;
> diff --git a/drivers/media/pci/smipcie/smipcie.h b/drivers/media/pci/smipcie/smipcie.h
> index 2b5e0154814c..f124d2cdead6 100644
> --- a/drivers/media/pci/smipcie/smipcie.h
> +++ b/drivers/media/pci/smipcie/smipcie.h
> @@ -17,6 +17,7 @@
> #include <linux/pci.h>
> #include <linux/dma-mapping.h>
> #include <linux/slab.h>
> +#include <linux/workqueue.h>
> #include <media/rc-core.h>
>
> #include <media/demux.h>
> @@ -257,7 +258,7 @@ struct smi_port {
> u32 _dmaInterruptCH0;
> u32 _dmaInterruptCH1;
> u32 _int_status;
> - struct tasklet_struct tasklet;
> + struct work_struct work;
> /* dvb */
> struct dmx_frontend hw_frontend;
> struct dmx_frontend mem_frontend;
> diff --git a/drivers/media/pci/ttpci/budget-av.c b/drivers/media/pci/ttpci/budget-av.c
> index a47c5850ef87..6e43b1a01191 100644
> --- a/drivers/media/pci/ttpci/budget-av.c
> +++ b/drivers/media/pci/ttpci/budget-av.c
> @@ -37,6 +37,7 @@
> #include <linux/interrupt.h>
> #include <linux/input.h>
> #include <linux/spinlock.h>
> +#include <linux/workqueue.h>
>
> #include <media/dvb_ca_en50221.h>
>
> @@ -55,7 +56,7 @@ struct budget_av {
> struct video_device vd;
> int cur_input;
> int has_saa7113;
> - struct tasklet_struct ciintf_irq_tasklet;
> + struct work_struct ciintf_irq_work;
> int slot_status;
> struct dvb_ca_en50221 ca;
> u8 reinitialise_demod:1;
> diff --git a/drivers/media/pci/ttpci/budget-ci.c b/drivers/media/pci/ttpci/budget-ci.c
> index 66e1a004ee43..11e0ed62707e 100644
> --- a/drivers/media/pci/ttpci/budget-ci.c
> +++ b/drivers/media/pci/ttpci/budget-ci.c
> @@ -17,6 +17,7 @@
> #include <linux/slab.h>
> #include <linux/interrupt.h>
> #include <linux/spinlock.h>
> +#include <linux/workqueue.h>
> #include <media/rc-core.h>
>
> #include "budget.h"
> @@ -80,7 +81,7 @@ DVB_DEFINE_MOD_OPT_ADAPTER_NR(adapter_nr);
>
> struct budget_ci_ir {
> struct rc_dev *dev;
> - struct tasklet_struct msp430_irq_tasklet;
> + struct work_struct msp430_irq_work;
> char name[72]; /* 40 + 32 for (struct saa7146_dev).name */
> char phys[32];
> int rc5_device;
> @@ -91,7 +92,7 @@ struct budget_ci_ir {
>
> struct budget_ci {
> struct budget budget;
> - struct tasklet_struct ciintf_irq_tasklet;
> + struct work_struct ciintf_irq_work;
> int slot_status;
> int ci_irq;
> struct dvb_ca_en50221 ca;
> @@ -99,9 +100,9 @@ struct budget_ci {
> u8 tuner_pll_address; /* used for philips_tdm1316l configs */
> };
>
> -static void msp430_ir_interrupt(struct tasklet_struct *t)
> +static void msp430_ir_interrupt(struct work_struct *t)
> {
> - struct budget_ci_ir *ir = from_tasklet(ir, t, msp430_irq_tasklet);
> + struct budget_ci_ir *ir = from_work(ir, t, msp430_irq_work);
> struct budget_ci *budget_ci = container_of(ir, typeof(*budget_ci), ir);
> struct rc_dev *dev = budget_ci->ir.dev;
> u32 command = ttpci_budget_debiread(&budget_ci->budget, DEBINOSWAP, DEBIADDR_IR, 2, 1, 0) >> 8;
> @@ -230,7 +231,7 @@ static int msp430_ir_init(struct budget_ci *budget_ci)
>
> budget_ci->ir.dev = dev;
>
> - tasklet_setup(&budget_ci->ir.msp430_irq_tasklet, msp430_ir_interrupt);
> + INIT_WORK(&budget_ci->ir.msp430_irq_work, msp430_ir_interrupt);
>
> SAA7146_IER_ENABLE(saa, MASK_06);
> saa7146_setgpio(saa, 3, SAA7146_GPIO_IRQHI);
> @@ -244,7 +245,7 @@ static void msp430_ir_deinit(struct budget_ci *budget_ci)
>
> SAA7146_IER_DISABLE(saa, MASK_06);
> saa7146_setgpio(saa, 3, SAA7146_GPIO_INPUT);
> - tasklet_kill(&budget_ci->ir.msp430_irq_tasklet);
> + cancel_work_sync(&budget_ci->ir.msp430_irq_work);
>
> rc_unregister_device(budget_ci->ir.dev);
> }
> @@ -348,10 +349,10 @@ static int ciintf_slot_ts_enable(struct dvb_ca_en50221 *ca, int slot)
> return 0;
> }
>
> -static void ciintf_interrupt(struct tasklet_struct *t)
> +static void ciintf_interrupt(struct work_struct *t)
> {
> - struct budget_ci *budget_ci = from_tasklet(budget_ci, t,
> - ciintf_irq_tasklet);
> + struct budget_ci *budget_ci = from_work(budget_ci, t,
> + ciintf_irq_work);
> struct saa7146_dev *saa = budget_ci->budget.dev;
> unsigned int flags;
>
> @@ -492,7 +493,7 @@ static int ciintf_init(struct budget_ci *budget_ci)
>
> // Setup CI slot IRQ
> if (budget_ci->ci_irq) {
> - tasklet_setup(&budget_ci->ciintf_irq_tasklet, ciintf_interrupt);
> + INIT_WORK(&budget_ci->ciintf_irq_work, ciintf_interrupt);
> if (budget_ci->slot_status != SLOTSTATUS_NONE) {
> saa7146_setgpio(saa, 0, SAA7146_GPIO_IRQLO);
> } else {
> @@ -532,7 +533,7 @@ static void ciintf_deinit(struct budget_ci *budget_ci)
> if (budget_ci->ci_irq) {
> SAA7146_IER_DISABLE(saa, MASK_03);
> saa7146_setgpio(saa, 0, SAA7146_GPIO_INPUT);
> - tasklet_kill(&budget_ci->ciintf_irq_tasklet);
> + cancel_work_sync(&budget_ci->ciintf_irq_work);
> }
>
> // reset interface
> @@ -558,13 +559,13 @@ static void budget_ci_irq(struct saa7146_dev *dev, u32 * isr)
> dprintk(8, "dev: %p, budget_ci: %p\n", dev, budget_ci);
>
> if (*isr & MASK_06)
> - tasklet_schedule(&budget_ci->ir.msp430_irq_tasklet);
> + queue_work(system_bh_wq, &budget_ci->ir.msp430_irq_work);
>
> if (*isr & MASK_10)
> ttpci_budget_irq10_handler(dev, isr);
>
> if ((*isr & MASK_03) && (budget_ci->budget.ci_present) && (budget_ci->ci_irq))
> - tasklet_schedule(&budget_ci->ciintf_irq_tasklet);
> + queue_work(system_bh_wq, &budget_ci->ciintf_irq_work);
> }
>
> static u8 philips_su1278_tt_inittab[] = {
> diff --git a/drivers/media/pci/ttpci/budget-core.c b/drivers/media/pci/ttpci/budget-core.c
> index 25f44c3eebf3..3443c12dc9f2 100644
> --- a/drivers/media/pci/ttpci/budget-core.c
> +++ b/drivers/media/pci/ttpci/budget-core.c
> @@ -171,9 +171,9 @@ static int budget_read_fe_status(struct dvb_frontend *fe,
> return ret;
> }
>
> -static void vpeirq(struct tasklet_struct *t)
> +static void vpeirq(struct work_struct *t)
> {
> - struct budget *budget = from_tasklet(budget, t, vpe_tasklet);
> + struct budget *budget = from_work(budget, t, vpe_work);
> u8 *mem = (u8 *) (budget->grabbing);
> u32 olddma = budget->ttbp;
> u32 newdma = saa7146_read(budget->dev, PCI_VDP3);
> @@ -520,7 +520,7 @@ int ttpci_budget_init(struct budget *budget, struct saa7146_dev *dev,
> /* upload all */
> saa7146_write(dev, GPIO_CTRL, 0x000000);
>
> - tasklet_setup(&budget->vpe_tasklet, vpeirq);
> + INIT_WORK(&budget->vpe_work, vpeirq);
>
> /* frontend power on */
> if (bi->type != BUDGET_FS_ACTIVY)
> @@ -557,7 +557,7 @@ int ttpci_budget_deinit(struct budget *budget)
>
> budget_unregister(budget);
>
> - tasklet_kill(&budget->vpe_tasklet);
> + cancel_work_sync(&budget->vpe_work);
>
> saa7146_vfree_destroy_pgtable(dev->pci, budget->grabbing, &budget->pt);
>
> @@ -575,7 +575,7 @@ void ttpci_budget_irq10_handler(struct saa7146_dev *dev, u32 * isr)
> dprintk(8, "dev: %p, budget: %p\n", dev, budget);
>
> if (*isr & MASK_10)
> - tasklet_schedule(&budget->vpe_tasklet);
> + queue_work(system_bh_wq, &budget->vpe_work);
> }
>
> void ttpci_budget_set_video_port(struct saa7146_dev *dev, int video_port)
> diff --git a/drivers/media/pci/ttpci/budget.h b/drivers/media/pci/ttpci/budget.h
> index bd87432e6cde..a3ee75e326b4 100644
> --- a/drivers/media/pci/ttpci/budget.h
> +++ b/drivers/media/pci/ttpci/budget.h
> @@ -12,6 +12,7 @@
>
> #include <linux/module.h>
> #include <linux/mutex.h>
> +#include <linux/workqueue.h>
>
> #include <media/drv-intf/saa7146.h>
>
> @@ -49,8 +50,8 @@ struct budget {
> unsigned char *grabbing;
> struct saa7146_pgtable pt;
>
> - struct tasklet_struct fidb_tasklet;
> - struct tasklet_struct vpe_tasklet;
> + struct work_struct fidb_work;
> + struct work_struct vpe_work;
>
> struct dmxdev dmxdev;
> struct dvb_demux demux;
> diff --git a/drivers/media/pci/tw5864/tw5864-core.c b/drivers/media/pci/tw5864/tw5864-core.c
> index 560ff1ddcc83..a58c268e94a8 100644
> --- a/drivers/media/pci/tw5864/tw5864-core.c
> +++ b/drivers/media/pci/tw5864/tw5864-core.c
> @@ -144,7 +144,7 @@ static void tw5864_h264_isr(struct tw5864_dev *dev)
> cur_frame->gop_seqno = input->frame_gop_seqno;
>
> dev->h264_buf_w_index = next_frame_index;
> - tasklet_schedule(&dev->tasklet);
> + queue_work(system_bh_wq, &dev->work);
>
> cur_frame = next_frame;
>
> diff --git a/drivers/media/pci/tw5864/tw5864-video.c b/drivers/media/pci/tw5864/tw5864-video.c
> index 8b1aae4b6319..ac2249626506 100644
> --- a/drivers/media/pci/tw5864/tw5864-video.c
> +++ b/drivers/media/pci/tw5864/tw5864-video.c
> @@ -6,6 +6,7 @@
> */
>
> #include <linux/module.h>
> +#include <linux/workqueue.h>
> #include <media/v4l2-common.h>
> #include <media/v4l2-event.h>
> #include <media/videobuf2-dma-contig.h>
> @@ -175,7 +176,7 @@ static const unsigned int intra4x4_lambda3[] = {
> static v4l2_std_id tw5864_get_v4l2_std(enum tw5864_vid_std std);
> static enum tw5864_vid_std tw5864_from_v4l2_std(v4l2_std_id v4l2_std);
>
> -static void tw5864_handle_frame_task(struct tasklet_struct *t);
> +static void tw5864_handle_frame_task(struct work_struct *t);

I think _task should be renamed to _work.

> static void tw5864_handle_frame(struct tw5864_h264_frame *frame);
> static void tw5864_frame_interval_set(struct tw5864_input *input);
>
> @@ -1062,7 +1063,7 @@ int tw5864_video_init(struct tw5864_dev *dev, int *video_nr)
> dev->irqmask |= TW5864_INTR_VLC_DONE | TW5864_INTR_TIMER;
> tw5864_irqmask_apply(dev);
>
> - tasklet_setup(&dev->tasklet, tw5864_handle_frame_task);
> + INIT_WORK(&dev->work, tw5864_handle_frame_task);
>
> for (i = 0; i < TW5864_INPUTS; i++) {
> dev->inputs[i].root = dev;
> @@ -1079,7 +1080,7 @@ int tw5864_video_init(struct tw5864_dev *dev, int *video_nr)
> for (i = last_input_nr_registered; i >= 0; i--)
> tw5864_video_input_fini(&dev->inputs[i]);
>
> - tasklet_kill(&dev->tasklet);
> + cancel_work_sync(&dev->work);
>
> free_dma:
> for (i = last_dma_allocated; i >= 0; i--) {
> @@ -1198,7 +1199,7 @@ void tw5864_video_fini(struct tw5864_dev *dev)
> {
> int i;
>
> - tasklet_kill(&dev->tasklet);
> + cancel_work_sync(&dev->work);
>
> for (i = 0; i < TW5864_INPUTS; i++)
> tw5864_video_input_fini(&dev->inputs[i]);
> @@ -1315,9 +1316,9 @@ static int tw5864_is_motion_triggered(struct tw5864_h264_frame *frame)
> return detected;
> }
>
> -static void tw5864_handle_frame_task(struct tasklet_struct *t)
> +static void tw5864_handle_frame_task(struct work_struct *t)
> {
> - struct tw5864_dev *dev = from_tasklet(dev, t, tasklet);
> + struct tw5864_dev *dev = from_work(dev, t, work);
> unsigned long flags;
> int batch_size = H264_BUF_CNT;
>
> diff --git a/drivers/media/pci/tw5864/tw5864.h b/drivers/media/pci/tw5864/tw5864.h
> index a8b6fbd5b710..278373859098 100644
> --- a/drivers/media/pci/tw5864/tw5864.h
> +++ b/drivers/media/pci/tw5864/tw5864.h
> @@ -12,6 +12,7 @@
> #include <linux/mutex.h>
> #include <linux/io.h>
> #include <linux/interrupt.h>
> +#include <linux/workqueue.h>
>
> #include <media/v4l2-common.h>
> #include <media/v4l2-ioctl.h>
> @@ -85,7 +86,7 @@ struct tw5864_input {
> int nr; /* input number */
> struct tw5864_dev *root;
> struct mutex lock; /* used for vidq and vdev */
> - spinlock_t slock; /* used for sync between ISR, tasklet & V4L2 API */
> + spinlock_t slock; /* used for sync between ISR, work & V4L2 API */
> struct video_device vdev;
> struct v4l2_ctrl_handler hdl;
> struct vb2_queue vidq;
> @@ -142,7 +143,7 @@ struct tw5864_h264_frame {
>
> /* global device status */
> struct tw5864_dev {
> - spinlock_t slock; /* used for sync between ISR, tasklet & V4L2 API */
> + spinlock_t slock; /* used for sync between ISR, work & V4L2 API */
> struct v4l2_device v4l2_dev;
> struct tw5864_input inputs[TW5864_INPUTS];
> #define H264_BUF_CNT 4
> @@ -150,7 +151,7 @@ struct tw5864_dev {
> int h264_buf_r_index;
> int h264_buf_w_index;
>
> - struct tasklet_struct tasklet;
> + struct work_struct work;
>
> int encoder_busy;
> /* Input number to check next for ready raw picture (in RR fashion) */
> diff --git a/drivers/media/platform/intel/pxa_camera.c b/drivers/media/platform/intel/pxa_camera.c
> index d904952bf00e..fdbf363237d6 100644
> --- a/drivers/media/platform/intel/pxa_camera.c
> +++ b/drivers/media/platform/intel/pxa_camera.c
> @@ -43,6 +43,7 @@
> #include <linux/videodev2.h>
>
> #include <linux/platform_data/media/camera-pxa.h>
> +#include <linux/workqueue.h>
>
> #define PXA_CAM_VERSION "0.0.6"
> #define PXA_CAM_DRV_NAME "pxa27x-camera"
> @@ -683,7 +684,7 @@ struct pxa_camera_dev {
> unsigned int buf_sequence;
>
> struct pxa_buffer *active;
> - struct tasklet_struct task_eof;
> + struct work_struct task_eof;

This should be renamed to eof_bh_work for consistency.

>
> u32 save_cicr[5];
> };
> @@ -1146,9 +1147,9 @@ static void pxa_camera_deactivate(struct pxa_camera_dev *pcdev)
> clk_disable_unprepare(pcdev->clk);
> }
>
> -static void pxa_camera_eof(struct tasklet_struct *t)
> +static void pxa_camera_eof(struct work_struct *t)
> {
> - struct pxa_camera_dev *pcdev = from_tasklet(pcdev, t, task_eof);
> + struct pxa_camera_dev *pcdev = from_work(pcdev, t, task_eof);
> unsigned long cifr;
> struct pxa_buffer *buf;
>
> @@ -1185,7 +1186,7 @@ static irqreturn_t pxa_camera_irq(int irq, void *data)
> if (status & CISR_EOF) {
> cicr0 = __raw_readl(pcdev->base + CICR0) | CICR0_EOFM;
> __raw_writel(cicr0, pcdev->base + CICR0);
> - tasklet_schedule(&pcdev->task_eof);
> + queue_work(system_bh_wq, &pcdev->task_eof);
> }
>
> return IRQ_HANDLED;
> @@ -2383,7 +2384,7 @@ static int pxa_camera_probe(struct platform_device *pdev)
> }
> }
>
> - tasklet_setup(&pcdev->task_eof, pxa_camera_eof);
> + INIT_WORK(&pcdev->task_eof, pxa_camera_eof);
>
> pxa_camera_activate(pcdev);
>
> @@ -2409,7 +2410,7 @@ static int pxa_camera_probe(struct platform_device *pdev)
> return 0;
> exit_deactivate:
> pxa_camera_deactivate(pcdev);
> - tasklet_kill(&pcdev->task_eof);
> + cancel_work_sync(&pcdev->task_eof);
> exit_free_dma:
> dma_release_channel(pcdev->dma_chans[2]);
> exit_free_dma_u:
> @@ -2428,7 +2429,7 @@ static void pxa_camera_remove(struct platform_device *pdev)
> struct pxa_camera_dev *pcdev = platform_get_drvdata(pdev);
>
> pxa_camera_deactivate(pcdev);
> - tasklet_kill(&pcdev->task_eof);
> + cancel_work_sync(&pcdev->task_eof);
> dma_release_channel(pcdev->dma_chans[0]);
> dma_release_channel(pcdev->dma_chans[1]);
> dma_release_channel(pcdev->dma_chans[2]);
> diff --git a/drivers/media/platform/marvell/mcam-core.c b/drivers/media/platform/marvell/mcam-core.c
> index 66688b4aece5..d6b96a7039be 100644
> --- a/drivers/media/platform/marvell/mcam-core.c
> +++ b/drivers/media/platform/marvell/mcam-core.c
> @@ -25,6 +25,7 @@
> #include <linux/clk-provider.h>
> #include <linux/videodev2.h>
> #include <linux/pm_runtime.h>
> +#include <linux/workqueue.h>
> #include <media/v4l2-device.h>
> #include <media/v4l2-ioctl.h>
> #include <media/v4l2-ctrls.h>
> @@ -439,9 +440,9 @@ static void mcam_ctlr_dma_vmalloc(struct mcam_camera *cam)
> /*
> * Copy data out to user space in the vmalloc case
> */
> -static void mcam_frame_tasklet(struct tasklet_struct *t)
> +static void mcam_frame_work(struct work_struct *t)
> {
> - struct mcam_camera *cam = from_tasklet(cam, t, s_tasklet);
> + struct mcam_camera *cam = from_work(cam, t, s_work);
> int i;
> unsigned long flags;
> struct mcam_vb_buffer *buf;
> @@ -480,7 +481,7 @@ static void mcam_frame_tasklet(struct tasklet_struct *t)
>
>
> /*
> - * Make sure our allocated buffers are up to the task.
> + * Make sure our allocated buffers are up to the work.

Drop this change: "up to the task" is an English expression, it doesn't refer
to a tasklet :-)

> */
> static int mcam_check_dma_buffers(struct mcam_camera *cam)
> {
> @@ -493,7 +494,7 @@ static int mcam_check_dma_buffers(struct mcam_camera *cam)
>
> static void mcam_vmalloc_done(struct mcam_camera *cam, int frame)
> {
> - tasklet_schedule(&cam->s_tasklet);
> + queue_work(system_bh_wq, &cam->s_work);
> }
>
> #else /* MCAM_MODE_VMALLOC */
> @@ -1305,7 +1306,7 @@ static int mcam_setup_vb2(struct mcam_camera *cam)
> break;
> case B_vmalloc:
> #ifdef MCAM_MODE_VMALLOC
> - tasklet_setup(&cam->s_tasklet, mcam_frame_tasklet);
> + INIT_WORK(&cam->s_work, mcam_frame_work);
> vq->ops = &mcam_vb2_ops;
> vq->mem_ops = &vb2_vmalloc_memops;
> cam->dma_setup = mcam_ctlr_dma_vmalloc;
> diff --git a/drivers/media/platform/marvell/mcam-core.h b/drivers/media/platform/marvell/mcam-core.h
> index 51e66db45af6..0d4b953dbb23 100644
> --- a/drivers/media/platform/marvell/mcam-core.h
> +++ b/drivers/media/platform/marvell/mcam-core.h
> @@ -9,6 +9,7 @@
>
> #include <linux/list.h>
> #include <linux/clk-provider.h>
> +#include <linux/workqueue.h>
> #include <media/v4l2-common.h>
> #include <media/v4l2-ctrls.h>
> #include <media/v4l2-dev.h>
> @@ -167,7 +168,7 @@ struct mcam_camera {
> unsigned int dma_buf_size; /* allocated size */
> void *dma_bufs[MAX_DMA_BUFS]; /* Internal buffer addresses */
> dma_addr_t dma_handles[MAX_DMA_BUFS]; /* Buffer bus addresses */
> - struct tasklet_struct s_tasklet;
> + struct work_struct s_work;
> #endif
> unsigned int sequence; /* Frame sequence number */
> unsigned int buf_seq[MAX_DMA_BUFS]; /* Sequence for individual bufs */
> diff --git a/drivers/media/platform/st/sti/c8sectpfe/c8sectpfe-core.c b/drivers/media/platform/st/sti/c8sectpfe/c8sectpfe-core.c
> index e4cf27b5a072..dc817cff4121 100644
> --- a/drivers/media/platform/st/sti/c8sectpfe/c8sectpfe-core.c
> +++ b/drivers/media/platform/st/sti/c8sectpfe/c8sectpfe-core.c
> @@ -33,6 +33,7 @@
> #include <linux/time.h>
> #include <linux/usb.h>
> #include <linux/wait.h>
> +#include <linux/workqueue.h>
>
> #include "c8sectpfe-common.h"
> #include "c8sectpfe-core.h"
> @@ -73,16 +74,16 @@ static void c8sectpfe_timer_interrupt(struct timer_list *t)
>
> /* is this descriptor initialised and TP enabled */
> if (channel->irec && readl(channel->irec + DMA_PRDS_TPENABLE))
> - tasklet_schedule(&channel->tsklet);
> + queue_work(system_bh_wq, &channel->work);
> }
>
> fei->timer.expires = jiffies + msecs_to_jiffies(POLL_MSECS);
> add_timer(&fei->timer);
> }
>
> -static void channel_swdemux_tsklet(struct tasklet_struct *t)
> +static void channel_swdemux_work(struct work_struct *t)
> {
> - struct channel_info *channel = from_tasklet(channel, t, tsklet);
> + struct channel_info *channel = from_work(channel, t, work);
> struct c8sectpfei *fei;
> unsigned long wp, rp;
> int pos, num_packets, n, size;
> @@ -211,7 +212,7 @@ static int c8sectpfe_start_feed(struct dvb_demux_feed *dvbdmxfeed)
>
> dev_dbg(fei->dev, "Starting channel=%p\n", channel);
>
> - tasklet_setup(&channel->tsklet, channel_swdemux_tsklet);
> + INIT_WORK(&channel->work, channel_swdemux_work);
>
> /* Reset the internal inputblock sram pointers */
> writel(channel->fifo,
> @@ -304,7 +305,7 @@ static int c8sectpfe_stop_feed(struct dvb_demux_feed *dvbdmxfeed)
> /* disable this channels descriptor */
> writel(0, channel->irec + DMA_PRDS_TPENABLE);
>
> - tasklet_disable(&channel->tsklet);
> + disable_work_sync(&channel->work);
>
> /* now request memdma channel goes idle */
> idlereq = (1 << channel->tsin_id) | IDLEREQ;
> @@ -631,8 +632,8 @@ static int configure_memdma_and_inputblock(struct c8sectpfei *fei,
> writel(tsin->back_buffer_busaddr, tsin->irec + DMA_PRDS_BUSWP_TP(0));
> writel(tsin->back_buffer_busaddr, tsin->irec + DMA_PRDS_BUSRP_TP(0));
>
> - /* initialize tasklet */
> - tasklet_setup(&tsin->tsklet, channel_swdemux_tsklet);
> + /* initialize work */
> + INIT_WORK(&tsin->work, channel_swdemux_work);
>
> return 0;
>
> diff --git a/drivers/media/platform/st/sti/c8sectpfe/c8sectpfe-core.h b/drivers/media/platform/st/sti/c8sectpfe/c8sectpfe-core.h
> index bf377cc82225..284d62a90987 100644
> --- a/drivers/media/platform/st/sti/c8sectpfe/c8sectpfe-core.h
> +++ b/drivers/media/platform/st/sti/c8sectpfe/c8sectpfe-core.h
> @@ -51,7 +51,7 @@ struct channel_info {
> unsigned long fifo;
>
> struct completion idle_completion;
> - struct tasklet_struct tsklet;
> + struct work_struct work;
>
> struct c8sectpfei *fei;
> void __iomem *irec;
> diff --git a/drivers/media/radio/wl128x/fmdrv.h b/drivers/media/radio/wl128x/fmdrv.h
> index da8920169df8..85282f638c4a 100644
> --- a/drivers/media/radio/wl128x/fmdrv.h
> +++ b/drivers/media/radio/wl128x/fmdrv.h
> @@ -15,6 +15,7 @@
> #include <sound/core.h>
> #include <sound/initval.h>
> #include <linux/timer.h>
> +#include <linux/workqueue.h>
> #include <media/v4l2-ioctl.h>
> #include <media/v4l2-common.h>
> #include <media/v4l2-device.h>
> @@ -200,15 +201,15 @@ struct fmdev {
> int streg_cbdata; /* status of ST registration */
>
> struct sk_buff_head rx_q; /* RX queue */
> - struct tasklet_struct rx_task; /* RX Tasklet */
> + struct work_struct rx_task; /* RX Work */

Rename to rx_bh_work

>
> struct sk_buff_head tx_q; /* TX queue */
> - struct tasklet_struct tx_task; /* TX Tasklet */
> + struct work_struct tx_task; /* TX Work */

Ditto.

> unsigned long last_tx_jiffies; /* Timestamp of last pkt sent */
> atomic_t tx_cnt; /* Number of packets can send at a time */
>
> struct sk_buff *resp_skb; /* Response from the chip */
> - /* Main task completion handler */
> + /* Main work completion handler */
> struct completion maintask_comp;
> /* Opcode of last command sent to the chip */
> u8 pre_op;
> diff --git a/drivers/media/radio/wl128x/fmdrv_common.c b/drivers/media/radio/wl128x/fmdrv_common.c
> index 3da8e5102bec..2528ce6c1cda 100644
> --- a/drivers/media/radio/wl128x/fmdrv_common.c
> +++ b/drivers/media/radio/wl128x/fmdrv_common.c
> @@ -9,7 +9,7 @@
> * one Channel-8 command to be sent to the chip).
> * 2) Sending each Channel-8 command to the chip and reading
> * response back over Shared Transport.
> - * 3) Managing TX and RX Queues and Tasklets.
> + * 3) Managing TX and RX Queues and Work.
> * 4) Handling FM Interrupt packet and taking appropriate action.
> * 5) Loading FM firmware to the chip (common, FM TX, and FM RX
> * firmware files based on mode selection)
> @@ -29,6 +29,7 @@
> #include "fmdrv_v4l2.h"
> #include "fmdrv_common.h"
> #include <linux/ti_wilink_st.h>
> +#include <linux/workqueue.h>
> #include "fmdrv_rx.h"
> #include "fmdrv_tx.h"
>
> @@ -244,10 +245,10 @@ void fmc_update_region_info(struct fmdev *fmdev, u8 region_to_set)
> }
>
> /*
> - * FM common sub-module will schedule this tasklet whenever it receives
> + * FM common sub-module will queue this work whenever it receives
> * FM packet from ST driver.
> */
> -static void recv_tasklet(struct tasklet_struct *t)
> +static void recv_work(struct work_struct *t)
> {
> struct fmdev *fmdev;
> struct fm_irq *irq_info;
> @@ -256,7 +257,7 @@ static void recv_tasklet(struct tasklet_struct *t)
> u8 num_fm_hci_cmds;
> unsigned long flags;
>
> - fmdev = from_tasklet(fmdev, t, tx_task);
> + fmdev = from_work(fmdev, t, tx_task);
> irq_info = &fmdev->irq_info;
> /* Process all packets in the RX queue */
> while ((skb = skb_dequeue(&fmdev->rx_q))) {
> @@ -322,22 +323,22 @@ static void recv_tasklet(struct tasklet_struct *t)
>
> /*
> * Check flow control field. If Num_FM_HCI_Commands field is
> - * not zero, schedule FM TX tasklet.
> + * not zero, queue FM TX work.
> */
> if (num_fm_hci_cmds && atomic_read(&fmdev->tx_cnt))
> if (!skb_queue_empty(&fmdev->tx_q))
> - tasklet_schedule(&fmdev->tx_task);
> + queue_work(system_bh_wq, &fmdev->tx_task);
> }
> }
>
> -/* FM send tasklet: is scheduled when FM packet has to be sent to chip */
> -static void send_tasklet(struct tasklet_struct *t)
> +/* FM send work: is scheduled when FM packet has to be sent to chip */
> +static void send_work(struct work_struct *t)
> {
> struct fmdev *fmdev;
> struct sk_buff *skb;
> int len;
>
> - fmdev = from_tasklet(fmdev, t, tx_task);
> + fmdev = from_work(fmdev, t, tx_task);
>
> if (!atomic_read(&fmdev->tx_cnt))
> return;
> @@ -366,7 +367,7 @@ static void send_tasklet(struct tasklet_struct *t)
> if (len < 0) {
> kfree_skb(skb);
> fmdev->resp_comp = NULL;
> - fmerr("TX tasklet failed to send skb(%p)\n", skb);
> + fmerr("TX work failed to send skb(%p)\n", skb);
> atomic_set(&fmdev->tx_cnt, 1);
> } else {
> fmdev->last_tx_jiffies = jiffies;
> @@ -374,7 +375,7 @@ static void send_tasklet(struct tasklet_struct *t)
> }
>
> /*
> - * Queues FM Channel-8 packet to FM TX queue and schedules FM TX tasklet for
> + * Queues FM Channel-8 packet to FM TX queue and schedules FM TX work for
> * transmission
> */
> static int fm_send_cmd(struct fmdev *fmdev, u8 fm_op, u16 type, void *payload,
> @@ -440,7 +441,7 @@ static int fm_send_cmd(struct fmdev *fmdev, u8 fm_op, u16 type, void *payload,
>
> fm_cb(skb)->completion = wait_completion;
> skb_queue_tail(&fmdev->tx_q, skb);
> - tasklet_schedule(&fmdev->tx_task);
> + queue_work(system_bh_wq, &fmdev->tx_task);
>
> return 0;
> }
> @@ -462,7 +463,7 @@ int fmc_send_cmd(struct fmdev *fmdev, u8 fm_op, u16 type, void *payload,
>
> if (!wait_for_completion_timeout(&fmdev->maintask_comp,
> FM_DRV_TX_TIMEOUT)) {
> - fmerr("Timeout(%d sec),didn't get regcompletion signal from RX tasklet\n",
> + fmerr("Timeout(%d sec),didn't get regcompletion signal from RX work\n",
> jiffies_to_msecs(FM_DRV_TX_TIMEOUT) / 1000);
> return -ETIMEDOUT;
> }
> @@ -1455,7 +1456,7 @@ static long fm_st_receive(void *arg, struct sk_buff *skb)
>
> memcpy(skb_push(skb, 1), &skb->cb[0], 1);
> skb_queue_tail(&fmdev->rx_q, skb);
> - tasklet_schedule(&fmdev->rx_task);
> + queue_work(system_bh_wq, &fmdev->rx_task);
>
> return 0;
> }
> @@ -1537,13 +1538,13 @@ int fmc_prepare(struct fmdev *fmdev)
> spin_lock_init(&fmdev->rds_buff_lock);
> spin_lock_init(&fmdev->resp_skb_lock);
>
> - /* Initialize TX queue and TX tasklet */
> + /* Initialize TX queue and TX work */
> skb_queue_head_init(&fmdev->tx_q);
> - tasklet_setup(&fmdev->tx_task, send_tasklet);
> + INIT_WORK(&fmdev->tx_task, send_work);
>
> - /* Initialize RX Queue and RX tasklet */
> + /* Initialize RX Queue and RX work */
> skb_queue_head_init(&fmdev->rx_q);
> - tasklet_setup(&fmdev->rx_task, recv_tasklet);
> + INIT_WORK(&fmdev->rx_task, recv_work);
>
> fmdev->irq_info.stage = 0;
> atomic_set(&fmdev->tx_cnt, 1);
> @@ -1589,8 +1590,8 @@ int fmc_release(struct fmdev *fmdev)
> /* Service pending read */
> wake_up_interruptible(&fmdev->rx.rds.read_queue);
>
> - tasklet_kill(&fmdev->tx_task);
> - tasklet_kill(&fmdev->rx_task);
> + cancel_work_sync(&fmdev->tx_task);
> + cancel_work_sync(&fmdev->rx_task);
>
> skb_queue_purge(&fmdev->tx_q);
> skb_queue_purge(&fmdev->rx_q);
> diff --git a/drivers/media/rc/mceusb.c b/drivers/media/rc/mceusb.c
> index c76ba24c1f55..a2e2e58b7506 100644
> --- a/drivers/media/rc/mceusb.c
> +++ b/drivers/media/rc/mceusb.c
> @@ -774,7 +774,7 @@ static void mceusb_dev_printdata(struct mceusb_dev *ir, u8 *buf, int buf_len,
>
> /*
> * Schedule work that can't be done in interrupt handlers
> - * (mceusb_dev_recv() and mce_write_callback()) nor tasklets.
> + * (mceusb_dev_recv() and mce_write_callback()) nor works.
> * Invokes mceusb_deferred_kevent() for recovering from
> * error events specified by the kevent bit field.
> */
> diff --git a/drivers/media/usb/ttusb-dec/ttusb_dec.c b/drivers/media/usb/ttusb-dec/ttusb_dec.c
> index 79faa2560613..c8bc84f4aefb 100644
> --- a/drivers/media/usb/ttusb-dec/ttusb_dec.c
> +++ b/drivers/media/usb/ttusb-dec/ttusb_dec.c
> @@ -19,6 +19,7 @@
> #include <linux/input.h>
>
> #include <linux/mutex.h>
> +#include <linux/workqueue.h>
>
> #include <media/dmxdev.h>
> #include <media/dvb_demux.h>
> @@ -139,7 +140,7 @@ struct ttusb_dec {
> int v_pes_postbytes;
>
> struct list_head urb_frame_list;
> - struct tasklet_struct urb_tasklet;
> + struct work_struct urb_work;
> spinlock_t urb_frame_list_lock;
>
> struct dvb_demux_filter *audio_filter;
> @@ -766,9 +767,9 @@ static void ttusb_dec_process_urb_frame(struct ttusb_dec *dec, u8 *b,
> }
> }
>
> -static void ttusb_dec_process_urb_frame_list(struct tasklet_struct *t)
> +static void ttusb_dec_process_urb_frame_list(struct work_struct *t)
> {
> - struct ttusb_dec *dec = from_tasklet(dec, t, urb_tasklet);
> + struct ttusb_dec *dec = from_work(dec, t, urb_work);
> struct list_head *item;
> struct urb_frame *frame;
> unsigned long flags;
> @@ -822,7 +823,7 @@ static void ttusb_dec_process_urb(struct urb *urb)
> spin_unlock_irqrestore(&dec->urb_frame_list_lock,
> flags);
>
> - tasklet_schedule(&dec->urb_tasklet);
> + queue_work(system_bh_wq, &dec->urb_work);
> }
> }
> } else {
> @@ -1198,11 +1199,11 @@ static int ttusb_dec_alloc_iso_urbs(struct ttusb_dec *dec)
> return 0;
> }
>
> -static void ttusb_dec_init_tasklet(struct ttusb_dec *dec)
> +static void ttusb_dec_init_work(struct ttusb_dec *dec)
> {
> spin_lock_init(&dec->urb_frame_list_lock);
> INIT_LIST_HEAD(&dec->urb_frame_list);
> - tasklet_setup(&dec->urb_tasklet, ttusb_dec_process_urb_frame_list);
> + INIT_WORK(&dec->urb_work, ttusb_dec_process_urb_frame_list);
> }
>
> static int ttusb_init_rc( struct ttusb_dec *dec)
> @@ -1588,12 +1589,12 @@ static void ttusb_dec_exit_usb(struct ttusb_dec *dec)
> ttusb_dec_free_iso_urbs(dec);
> }
>
> -static void ttusb_dec_exit_tasklet(struct ttusb_dec *dec)
> +static void ttusb_dec_exit_work(struct ttusb_dec *dec)
> {
> struct list_head *item;
> struct urb_frame *frame;
>
> - tasklet_kill(&dec->urb_tasklet);
> + cancel_work_sync(&dec->urb_work);
>
> while ((item = dec->urb_frame_list.next) != &dec->urb_frame_list) {
> frame = list_entry(item, struct urb_frame, urb_frame_list);
> @@ -1703,7 +1704,7 @@ static int ttusb_dec_probe(struct usb_interface *intf,
>
> ttusb_dec_init_v_pes(dec);
> ttusb_dec_init_filters(dec);
> - ttusb_dec_init_tasklet(dec);
> + ttusb_dec_init_work(dec);
>
> dec->active = 1;
>
> @@ -1729,7 +1730,7 @@ static void ttusb_dec_disconnect(struct usb_interface *intf)
> dprintk("%s\n", __func__);
>
> if (dec->active) {
> - ttusb_dec_exit_tasklet(dec);
> + ttusb_dec_exit_work(dec);
> ttusb_dec_exit_filters(dec);
> if(enable_rc)
> ttusb_dec_exit_rc(dec);

Regards,

Hans