Re: [PATCH] scsi: sas: Convert timers to use timer_setup()

From: Jinpu Wang
Date: Wed Nov 01 2017 - 03:58:54 EST

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On Wed, Oct 25, 2017 at 12:08 PM, Kees Cook <keescook@xxxxxxxxxxxx> wrote:
> In preparation for unconditionally passing the struct timer_list pointer to
> all timer callbacks, switch to using the new timer_setup() and from_timer()
> to pass the timer pointer explicitly. This requires adding a pointer to
> hold the timer's target task, as there isn't a link back from slow_task.
>
> Cc: John Garry <john.garry@xxxxxxxxxx>
> Cc: "James E.J. Bottomley" <jejb@xxxxxxxxxxxxxxxxxx>
> Cc: "Martin K. Petersen" <martin.petersen@xxxxxxxxxx>
> Cc: Jack Wang <jinpu.wang@xxxxxxxxxxxxxxxx>
> Cc: lindar_liu@xxxxxxxxx
> Cc: Jens Axboe <axboe@xxxxxx>
> Cc: Hannes Reinecke <hare@xxxxxxxx>
> Cc: Johannes Thumshirn <jthumshirn@xxxxxxx>
> Cc: Benjamin Block <bblock@xxxxxxxxxxxxxxxxxx>
> Cc: Baoyou Xie <baoyou.xie@xxxxxxxxxx>
> Cc: Wei Yongjun <weiyongjun1@xxxxxxxxxx>
> Cc: linux-scsi@xxxxxxxxxxxxxxx
> Signed-off-by: Kees Cook <keescook@xxxxxxxxxxxx>
> ---
> drivers/scsi/hisi_sas/hisi_sas.h | 1 -
> drivers/scsi/hisi_sas/hisi_sas_main.c | 14 ++++++--------
> drivers/scsi/hisi_sas/hisi_sas_v1_hw.c | 6 +++---
> drivers/scsi/hisi_sas/hisi_sas_v2_hw.c | 24 +++++++++++-------------
> drivers/scsi/hisi_sas/hisi_sas_v3_hw.c | 2 +-
> drivers/scsi/libsas/sas_expander.c | 8 ++++----
> drivers/scsi/libsas/sas_init.c | 3 ++-
> drivers/scsi/libsas/sas_scsi_host.c | 2 +-
> drivers/scsi/mvsas/mv_init.c | 3 +--
> drivers/scsi/mvsas/mv_sas.c | 15 +++++++--------
> drivers/scsi/mvsas/mv_sas.h | 1 -
> drivers/scsi/pm8001/pm8001_sas.c | 11 +++++------
> include/scsi/libsas.h | 1 +
> 13 files changed, 42 insertions(+), 49 deletions(-)
>
> diff --git a/drivers/scsi/hisi_sas/hisi_sas.h b/drivers/scsi/hisi_sas/hisi_sas.h
> index 07f4a4cfbec1..15692ea05ced 100644
> --- a/drivers/scsi/hisi_sas/hisi_sas.h
> +++ b/drivers/scsi/hisi_sas/hisi_sas.h
> @@ -103,7 +103,6 @@ struct hisi_sas_phy {
> struct hisi_sas_port *port;
> struct asd_sas_phy sas_phy;
> struct sas_identify identify;
> - struct timer_list timer;
> struct work_struct phyup_ws;
> u64 port_id; /* from hw */
> u64 dev_sas_addr;
> diff --git a/drivers/scsi/hisi_sas/hisi_sas_main.c b/drivers/scsi/hisi_sas/hisi_sas_main.c
> index 9e2990268f00..0d772a83fbe4 100644
> --- a/drivers/scsi/hisi_sas/hisi_sas_main.c
> +++ b/drivers/scsi/hisi_sas/hisi_sas_main.c
> @@ -627,7 +627,6 @@ static void hisi_sas_phy_init(struct hisi_hba *hisi_hba, int phy_no)
>
> phy->hisi_hba = hisi_hba;
> phy->port = NULL;
> - init_timer(&phy->timer);
> sas_phy->enabled = (phy_no < hisi_hba->n_phy) ? 1 : 0;
> sas_phy->class = SAS;
> sas_phy->iproto = SAS_PROTOCOL_ALL;
> @@ -792,9 +791,10 @@ static void hisi_sas_task_done(struct sas_task *task)
> complete(&task->slow_task->completion);
> }
>
> -static void hisi_sas_tmf_timedout(unsigned long data)
> +static void hisi_sas_tmf_timedout(struct timer_list *t)
> {
> - struct sas_task *task = (struct sas_task *)data;
> + struct sas_task_slow *slow = from_timer(slow, t, timer);
> + struct sas_task *task = slow->task;
> unsigned long flags;
>
> spin_lock_irqsave(&task->task_state_lock, flags);
> @@ -833,8 +833,7 @@ static int hisi_sas_exec_internal_tmf_task(struct domain_device *device,
> }
> task->task_done = hisi_sas_task_done;
>
> - task->slow_task->timer.data = (unsigned long) task;
> - task->slow_task->timer.function = hisi_sas_tmf_timedout;
> + task->slow_task->timer.function = (TIMER_FUNC_TYPE)hisi_sas_tmf_timedout;
> task->slow_task->timer.expires = jiffies + TASK_TIMEOUT*HZ;
> add_timer(&task->slow_task->timer);
>
> @@ -1445,8 +1444,7 @@ hisi_sas_internal_task_abort(struct hisi_hba *hisi_hba,
> task->dev = device;
> task->task_proto = device->tproto;
> task->task_done = hisi_sas_task_done;
> - task->slow_task->timer.data = (unsigned long)task;
> - task->slow_task->timer.function = hisi_sas_tmf_timedout;
> + task->slow_task->timer.function = (TIMER_FUNC_TYPE)hisi_sas_tmf_timedout;
> task->slow_task->timer.expires = jiffies + msecs_to_jiffies(110);
> add_timer(&task->slow_task->timer);
>
> @@ -1875,7 +1873,7 @@ static struct Scsi_Host *hisi_sas_shost_alloc(struct platform_device *pdev,
> hisi_hba->shost = shost;
> SHOST_TO_SAS_HA(shost) = &hisi_hba->sha;
>
> - init_timer(&hisi_hba->timer);
> + timer_setup(&hisi_hba->timer, NULL, 0);
>
> if (hisi_sas_get_fw_info(hisi_hba) < 0)
> goto err_out;
> diff --git a/drivers/scsi/hisi_sas/hisi_sas_v1_hw.c b/drivers/scsi/hisi_sas/hisi_sas_v1_hw.c
> index 08eca20b0b81..9385554e43a6 100644
> --- a/drivers/scsi/hisi_sas/hisi_sas_v1_hw.c
> +++ b/drivers/scsi/hisi_sas/hisi_sas_v1_hw.c
> @@ -807,9 +807,9 @@ static void phy_hard_reset_v1_hw(struct hisi_hba *hisi_hba, int phy_no)
> start_phy_v1_hw(hisi_hba, phy_no);
> }
>
> -static void start_phys_v1_hw(unsigned long data)
> +static void start_phys_v1_hw(struct timer_list *t)
> {
> - struct hisi_hba *hisi_hba = (struct hisi_hba *)data;
> + struct hisi_hba *hisi_hba = from_timer(hisi_hba, t, timer);
> int i;
>
> for (i = 0; i < hisi_hba->n_phy; i++) {
> @@ -828,7 +828,7 @@ static void phys_init_v1_hw(struct hisi_hba *hisi_hba)
> hisi_sas_phy_read32(hisi_hba, i, CHL_INT2_MSK);
> }
>
> - setup_timer(timer, start_phys_v1_hw, (unsigned long)hisi_hba);
> + timer_setup(timer, start_phys_v1_hw, 0);
> mod_timer(timer, jiffies + HZ);
> }
>
> diff --git a/drivers/scsi/hisi_sas/hisi_sas_v2_hw.c b/drivers/scsi/hisi_sas/hisi_sas_v2_hw.c
> index 779af979b6db..b1f097dabd01 100644
> --- a/drivers/scsi/hisi_sas/hisi_sas_v2_hw.c
> +++ b/drivers/scsi/hisi_sas/hisi_sas_v2_hw.c
> @@ -728,7 +728,7 @@ enum {
> #define ERR_ON_RX_PHASE(err_phase) (err_phase == 0x10 || \
> err_phase == 0x20 || err_phase == 0x40)
>
> -static void link_timeout_disable_link(unsigned long data);
> +static void link_timeout_disable_link(struct timer_list *t);
>
> static u32 hisi_sas_read32(struct hisi_hba *hisi_hba, u32 off)
> {
> @@ -1270,9 +1270,9 @@ static void init_reg_v2_hw(struct hisi_hba *hisi_hba)
> upper_32_bits(hisi_hba->initial_fis_dma));
> }
>
> -static void link_timeout_enable_link(unsigned long data)
> +static void link_timeout_enable_link(struct timer_list *t)
> {
> - struct hisi_hba *hisi_hba = (struct hisi_hba *)data;
> + struct hisi_hba *hisi_hba = from_timer(hisi_hba, t, timer);
> int i, reg_val;
>
> for (i = 0; i < hisi_hba->n_phy; i++) {
> @@ -1287,13 +1287,13 @@ static void link_timeout_enable_link(unsigned long data)
> }
> }
>
> - hisi_hba->timer.function = link_timeout_disable_link;
> + hisi_hba->timer.function = (TIMER_FUNC_TYPE)link_timeout_disable_link;
> mod_timer(&hisi_hba->timer, jiffies + msecs_to_jiffies(900));
> }
>
> -static void link_timeout_disable_link(unsigned long data)
> +static void link_timeout_disable_link(struct timer_list *t)
> {
> - struct hisi_hba *hisi_hba = (struct hisi_hba *)data;
> + struct hisi_hba *hisi_hba = from_timer(hisi_hba, t, timer);
> int i, reg_val;
>
> reg_val = hisi_sas_read32(hisi_hba, PHY_STATE);
> @@ -1308,14 +1308,13 @@ static void link_timeout_disable_link(unsigned long data)
> }
> }
>
> - hisi_hba->timer.function = link_timeout_enable_link;
> + hisi_hba->timer.function = (TIMER_FUNC_TYPE)link_timeout_enable_link;
> mod_timer(&hisi_hba->timer, jiffies + msecs_to_jiffies(100));
> }
>
> static void set_link_timer_quirk(struct hisi_hba *hisi_hba)
> {
> - hisi_hba->timer.data = (unsigned long)hisi_hba;
> - hisi_hba->timer.function = link_timeout_disable_link;
> + hisi_hba->timer.function = (TIMER_FUNC_TYPE)link_timeout_disable_link;
> hisi_hba->timer.expires = jiffies + msecs_to_jiffies(1000);
> add_timer(&hisi_hba->timer);
> }
> @@ -2574,9 +2573,9 @@ static int prep_ata_v2_hw(struct hisi_hba *hisi_hba,
> return 0;
> }
>
> -static void hisi_sas_internal_abort_quirk_timeout(unsigned long data)
> +static void hisi_sas_internal_abort_quirk_timeout(struct timer_list *t)
> {
> - struct hisi_sas_slot *slot = (struct hisi_sas_slot *)data;
> + struct hisi_sas_slot *slot = from_timer(slot, t, internal_abort_timer);
> struct hisi_sas_port *port = slot->port;
> struct asd_sas_port *asd_sas_port;
> struct asd_sas_phy *sas_phy;
> @@ -2619,8 +2618,7 @@ static int prep_abort_v2_hw(struct hisi_hba *hisi_hba,
> struct timer_list *timer = &slot->internal_abort_timer;
>
> /* setup the quirk timer */
> - setup_timer(timer, hisi_sas_internal_abort_quirk_timeout,
> - (unsigned long)slot);
> + timer_setup(timer, hisi_sas_internal_abort_quirk_timeout, 0);
> /* Set the timeout to 10ms less than internal abort timeout */
> mod_timer(timer, jiffies + msecs_to_jiffies(100));
>
> diff --git a/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c b/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c
> index 2e5fa9717be8..3f2f0baf2a5e 100644
> --- a/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c
> +++ b/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c
> @@ -1823,7 +1823,7 @@ hisi_sas_shost_alloc_pci(struct pci_dev *pdev)
> hisi_hba->shost = shost;
> SHOST_TO_SAS_HA(shost) = &hisi_hba->sha;
>
> - init_timer(&hisi_hba->timer);
> + timer_setup(&hisi_hba->timer, NULL, 0);
>
> if (hisi_sas_get_fw_info(hisi_hba) < 0)
> goto err_out;
> diff --git a/drivers/scsi/libsas/sas_expander.c b/drivers/scsi/libsas/sas_expander.c
> index 6b4fd2375178..174e5eff6155 100644
> --- a/drivers/scsi/libsas/sas_expander.c
> +++ b/drivers/scsi/libsas/sas_expander.c
> @@ -41,9 +41,10 @@ static int sas_disable_routing(struct domain_device *dev, u8 *sas_addr);
>
> /* ---------- SMP task management ---------- */
>
> -static void smp_task_timedout(unsigned long _task)
> +static void smp_task_timedout(struct timer_list *t)
> {
> - struct sas_task *task = (void *) _task;
> + struct sas_task_slow *slow = from_timer(slow, t, timer);
> + struct sas_task *task = slow->task;
> unsigned long flags;
>
> spin_lock_irqsave(&task->task_state_lock, flags);
> @@ -91,8 +92,7 @@ static int smp_execute_task_sg(struct domain_device *dev,
>
> task->task_done = smp_task_done;
>
> - task->slow_task->timer.data = (unsigned long) task;
> - task->slow_task->timer.function = smp_task_timedout;
> + task->slow_task->timer.function = (TIMER_FUNC_TYPE)smp_task_timedout;
> task->slow_task->timer.expires = jiffies + SMP_TIMEOUT*HZ;
> add_timer(&task->slow_task->timer);
>
> diff --git a/drivers/scsi/libsas/sas_init.c b/drivers/scsi/libsas/sas_init.c
> index d3f5b57b3ebf..64fa6f53cb8b 100644
> --- a/drivers/scsi/libsas/sas_init.c
> +++ b/drivers/scsi/libsas/sas_init.c
> @@ -66,7 +66,8 @@ struct sas_task *sas_alloc_slow_task(gfp_t flags)
> }
>
> task->slow_task = slow;
> - init_timer(&slow->timer);
> + slow->task = task;
> + timer_setup(&slow->timer, NULL, 0);
> init_completion(&slow->completion);
>
> return task;
> diff --git a/drivers/scsi/libsas/sas_scsi_host.c b/drivers/scsi/libsas/sas_scsi_host.c
> index ea8ad06ff582..91795eb56206 100644
> --- a/drivers/scsi/libsas/sas_scsi_host.c
> +++ b/drivers/scsi/libsas/sas_scsi_host.c
> @@ -919,7 +919,7 @@ void sas_task_abort(struct sas_task *task)
> return;
> if (!del_timer(&slow->timer))
> return;
> - slow->timer.function(slow->timer.data);
> + slow->timer.function((TIMER_DATA_TYPE)&slow->timer);
> return;
> }
>
> diff --git a/drivers/scsi/mvsas/mv_init.c b/drivers/scsi/mvsas/mv_init.c
> index 718c88de328b..8c91637cd598 100644
> --- a/drivers/scsi/mvsas/mv_init.c
> +++ b/drivers/scsi/mvsas/mv_init.c
> @@ -95,7 +95,7 @@ static void mvs_phy_init(struct mvs_info *mvi, int phy_id)
>
> phy->mvi = mvi;
> phy->port = NULL;
> - init_timer(&phy->timer);
> + timer_setup(&phy->timer, NULL, 0);
> sas_phy->enabled = (phy_id < mvi->chip->n_phy) ? 1 : 0;
> sas_phy->class = SAS;
> sas_phy->iproto = SAS_PROTOCOL_ALL;
> @@ -248,7 +248,6 @@ static int mvs_alloc(struct mvs_info *mvi, struct Scsi_Host *shost)
> mvi->devices[i].dev_type = SAS_PHY_UNUSED;
> mvi->devices[i].device_id = i;
> mvi->devices[i].dev_status = MVS_DEV_NORMAL;
> - init_timer(&mvi->devices[i].timer);
> }
>
> /*
> diff --git a/drivers/scsi/mvsas/mv_sas.c b/drivers/scsi/mvsas/mv_sas.c
> index ee81d10252e0..cff1c37b8d2e 100644
> --- a/drivers/scsi/mvsas/mv_sas.c
> +++ b/drivers/scsi/mvsas/mv_sas.c
> @@ -1283,9 +1283,10 @@ static void mvs_task_done(struct sas_task *task)
> complete(&task->slow_task->completion);
> }
>
> -static void mvs_tmf_timedout(unsigned long data)
> +static void mvs_tmf_timedout(struct timer_list *t)
> {
> - struct sas_task *task = (struct sas_task *)data;
> + struct sas_task_slow *slow = from_timer(slow, t, timer);
> + struct sas_task *task = slow->task;
>
> task->task_state_flags |= SAS_TASK_STATE_ABORTED;
> complete(&task->slow_task->completion);
> @@ -1309,8 +1310,7 @@ static int mvs_exec_internal_tmf_task(struct domain_device *dev,
> memcpy(&task->ssp_task, parameter, para_len);
> task->task_done = mvs_task_done;
>
> - task->slow_task->timer.data = (unsigned long) task;
> - task->slow_task->timer.function = mvs_tmf_timedout;
> + task->slow_task->timer.function = (TIMER_FUNC_TYPE)mvs_tmf_timedout;
> task->slow_task->timer.expires = jiffies + MVS_TASK_TIMEOUT*HZ;
> add_timer(&task->slow_task->timer);
>
> @@ -1954,9 +1954,9 @@ static int mvs_handle_event(struct mvs_info *mvi, void *data, int handler)
> return ret;
> }
>
> -static void mvs_sig_time_out(unsigned long tphy)
> +static void mvs_sig_time_out(struct timer_list *t)
> {
> - struct mvs_phy *phy = (struct mvs_phy *)tphy;
> + struct mvs_phy *phy = from_timer(phy, t, timer);
> struct mvs_info *mvi = phy->mvi;
> u8 phy_no;
>
> @@ -2020,8 +2020,7 @@ void mvs_int_port(struct mvs_info *mvi, int phy_no, u32 events)
> MVS_CHIP_DISP->write_port_irq_mask(mvi, phy_no,
> tmp | PHYEV_SIG_FIS);
> if (phy->timer.function == NULL) {
> - phy->timer.data = (unsigned long)phy;
> - phy->timer.function = mvs_sig_time_out;
> + phy->timer.function = (TIMER_FUNC_TYPE)mvs_sig_time_out;
> phy->timer.expires = jiffies + 5*HZ;
> add_timer(&phy->timer);
> }
> diff --git a/drivers/scsi/mvsas/mv_sas.h b/drivers/scsi/mvsas/mv_sas.h
> index f9afd4cdd4c4..080676c1c9e5 100644
> --- a/drivers/scsi/mvsas/mv_sas.h
> +++ b/drivers/scsi/mvsas/mv_sas.h
> @@ -247,7 +247,6 @@ struct mvs_device {
> enum sas_device_type dev_type;
> struct mvs_info *mvi_info;
> struct domain_device *sas_device;
> - struct timer_list timer;
> u32 attached_phy;
> u32 device_id;
> u32 running_req;
> diff --git a/drivers/scsi/pm8001/pm8001_sas.c b/drivers/scsi/pm8001/pm8001_sas.c
> index ce584c31d36e..7b2f92ae9866 100644
> --- a/drivers/scsi/pm8001/pm8001_sas.c
> +++ b/drivers/scsi/pm8001/pm8001_sas.c
> @@ -656,9 +656,10 @@ void pm8001_task_done(struct sas_task *task)
> complete(&task->slow_task->completion);
> }
>
> -static void pm8001_tmf_timedout(unsigned long data)
> +static void pm8001_tmf_timedout(struct timer_list *t)
> {
> - struct sas_task *task = (struct sas_task *)data;
> + struct sas_task_slow *slow = from_timer(slow, t, timer);
> + struct sas_task *task = slow->task;
>
> task->task_state_flags |= SAS_TASK_STATE_ABORTED;
> complete(&task->slow_task->completion);
> @@ -694,8 +695,7 @@ static int pm8001_exec_internal_tmf_task(struct domain_device *dev,
> task->task_proto = dev->tproto;
> memcpy(&task->ssp_task, parameter, para_len);
> task->task_done = pm8001_task_done;
> - task->slow_task->timer.data = (unsigned long)task;
> - task->slow_task->timer.function = pm8001_tmf_timedout;
> + task->slow_task->timer.function = (TIMER_FUNC_TYPE)pm8001_tmf_timedout;
> task->slow_task->timer.expires = jiffies + PM8001_TASK_TIMEOUT*HZ;
> add_timer(&task->slow_task->timer);
>
> @@ -781,8 +781,7 @@ pm8001_exec_internal_task_abort(struct pm8001_hba_info *pm8001_ha,
> task->dev = dev;
> task->task_proto = dev->tproto;
> task->task_done = pm8001_task_done;
> - task->slow_task->timer.data = (unsigned long)task;
> - task->slow_task->timer.function = pm8001_tmf_timedout;
> + task->slow_task->timer.function = (TIMER_FUNC_TYPE)pm8001_tmf_timedout;
> task->slow_task->timer.expires = jiffies + PM8001_TASK_TIMEOUT * HZ;
> add_timer(&task->slow_task->timer);
>
> diff --git a/include/scsi/libsas.h b/include/scsi/libsas.h
> index ab6e18f1c01f..0f9cbf96c093 100644
> --- a/include/scsi/libsas.h
> +++ b/include/scsi/libsas.h
> @@ -605,6 +605,7 @@ struct sas_task_slow {
> */
> struct timer_list timer;
> struct completion completion;
> + struct sas_task *task;
> };
>
> #define SAS_TASK_STATE_PENDING 1
> --
> 2.7.4
>
>
> --
> Kees Cook
> Pixel Security

Thanks Kees,
Reviewed-by: Jack Wang <jinpu.wang@xxxxxxxxxxxxxxxx>

--

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