[RFC 2/3] ata: make qc_prep return an int

From: Jiri Slaby
Date: Fri Jun 14 2019 - 03:16:29 EST

In case a driver wants to return an error. sata_mv is one of those --
see the next patch.

Signed-off-by: Jiri Slaby <jslaby@xxxxxxx>
Cc: Jens Axboe <axboe@xxxxxxxxx>
Cc: linux-ide@xxxxxxxxxxxxxxx
---
Documentation/driver-api/libata.rst | 2 +-
drivers/ata/acard-ahci.c | 6 ++++--
drivers/ata/libahci.c | 6 ++++--
drivers/ata/libata-core.c | 9 +++++++--
drivers/ata/libata-sff.c | 12 ++++++++----
drivers/ata/pata_macio.c | 6 ++++--
drivers/ata/pata_pxa.c | 8 +++++---
drivers/ata/pdc_adma.c | 7 ++++---
drivers/ata/sata_fsl.c | 4 +++-
drivers/ata/sata_inic162x.c | 4 +++-
drivers/ata/sata_mv.c | 26 +++++++++++++++-----------
drivers/ata/sata_nv.c | 18 +++++++++++-------
drivers/ata/sata_promise.c | 6 ++++--
drivers/ata/sata_qstor.c | 8 +++++---
drivers/ata/sata_rcar.c | 6 ++++--
drivers/ata/sata_sil.c | 8 +++++---
drivers/ata/sata_sil24.c | 6 ++++--
drivers/ata/sata_sx4.c | 6 ++++--
include/linux/libata.h | 12 ++++++------
19 files changed, 101 insertions(+), 59 deletions(-)

diff --git a/Documentation/driver-api/libata.rst b/Documentation/driver-api/libata.rst
index c2ee38098e85..ec17fea6ca57 100644
--- a/Documentation/driver-api/libata.rst
+++ b/Documentation/driver-api/libata.rst
@@ -250,7 +250,7 @@ High-level taskfile hooks

::

- void (*qc_prep) (struct ata_queued_cmd *qc);
+ int (*qc_prep) (struct ata_queued_cmd *qc);
int (*qc_issue) (struct ata_queued_cmd *qc);


diff --git a/drivers/ata/acard-ahci.c b/drivers/ata/acard-ahci.c
index b1b49dbd0b14..af768298969a 100644
--- a/drivers/ata/acard-ahci.c
+++ b/drivers/ata/acard-ahci.c
@@ -56,7 +56,7 @@ struct acard_sg {
__le32 size; /* bit 31 (EOT) max==0x10000 (64k) */
};

-static void acard_ahci_qc_prep(struct ata_queued_cmd *qc);
+static int acard_ahci_qc_prep(struct ata_queued_cmd *qc);
static bool acard_ahci_qc_fill_rtf(struct ata_queued_cmd *qc);
static int acard_ahci_port_start(struct ata_port *ap);
static int acard_ahci_init_one(struct pci_dev *pdev, const struct pci_device_id *ent);
@@ -241,7 +241,7 @@ static unsigned int acard_ahci_fill_sg(struct ata_queued_cmd *qc, void *cmd_tbl)
return si;
}

-static void acard_ahci_qc_prep(struct ata_queued_cmd *qc)
+static int acard_ahci_qc_prep(struct ata_queued_cmd *qc)
{
struct ata_port *ap = qc->ap;
struct ahci_port_priv *pp = ap->private_data;
@@ -279,6 +279,8 @@ static void acard_ahci_qc_prep(struct ata_queued_cmd *qc)
opts |= AHCI_CMD_ATAPI | AHCI_CMD_PREFETCH;

ahci_fill_cmd_slot(pp, qc->hw_tag, opts);
+
+ return 0;
}

static bool acard_ahci_qc_fill_rtf(struct ata_queued_cmd *qc)
diff --git a/drivers/ata/libahci.c b/drivers/ata/libahci.c
index 0984c4b76d7e..9b6c4c9a2af7 100644
--- a/drivers/ata/libahci.c
+++ b/drivers/ata/libahci.c
@@ -57,7 +57,7 @@ static int ahci_scr_write(struct ata_link *link, unsigned int sc_reg, u32 val);
static bool ahci_qc_fill_rtf(struct ata_queued_cmd *qc);
static int ahci_port_start(struct ata_port *ap);
static void ahci_port_stop(struct ata_port *ap);
-static void ahci_qc_prep(struct ata_queued_cmd *qc);
+static int ahci_qc_prep(struct ata_queued_cmd *qc);
static int ahci_pmp_qc_defer(struct ata_queued_cmd *qc);
static void ahci_freeze(struct ata_port *ap);
static void ahci_thaw(struct ata_port *ap);
@@ -1625,7 +1625,7 @@ static int ahci_pmp_qc_defer(struct ata_queued_cmd *qc)
return sata_pmp_qc_defer_cmd_switch(qc);
}

-static void ahci_qc_prep(struct ata_queued_cmd *qc)
+static int ahci_qc_prep(struct ata_queued_cmd *qc)
{
struct ata_port *ap = qc->ap;
struct ahci_port_priv *pp = ap->private_data;
@@ -1661,6 +1661,8 @@ static void ahci_qc_prep(struct ata_queued_cmd *qc)
opts |= AHCI_CMD_ATAPI | AHCI_CMD_PREFETCH;

ahci_fill_cmd_slot(pp, qc->hw_tag, opts);
+
+ return 0;
}

static void ahci_fbs_dec_intr(struct ata_port *ap)
diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index aaa57e0c809d..325cd1edf957 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -4979,7 +4979,10 @@ int ata_std_qc_defer(struct ata_queued_cmd *qc)
return ATA_DEFER_LINK;
}

-void ata_noop_qc_prep(struct ata_queued_cmd *qc) { }
+int ata_noop_qc_prep(struct ata_queued_cmd *qc)
+{
+ return 0;
+}

/**
* ata_sg_init - Associate command with scatter-gather table.
@@ -5442,7 +5445,9 @@ void ata_qc_issue(struct ata_queued_cmd *qc)
return;
}

- ap->ops->qc_prep(qc);
+ qc->err_mask |= ap->ops->qc_prep(qc);
+ if (unlikely(qc->err_mask))
+ goto err;
trace_ata_qc_issue(qc);
qc->err_mask |= ap->ops->qc_issue(qc);
if (unlikely(qc->err_mask))
diff --git a/drivers/ata/libata-sff.c b/drivers/ata/libata-sff.c
index 10aa27882142..f2752b909ac3 100644
--- a/drivers/ata/libata-sff.c
+++ b/drivers/ata/libata-sff.c
@@ -2673,12 +2673,14 @@ static void ata_bmdma_fill_sg_dumb(struct ata_queued_cmd *qc)
* LOCKING:
* spin_lock_irqsave(host lock)
*/
-void ata_bmdma_qc_prep(struct ata_queued_cmd *qc)
+int ata_bmdma_qc_prep(struct ata_queued_cmd *qc)
{
if (!(qc->flags & ATA_QCFLAG_DMAMAP))
- return;
+ return 0;

ata_bmdma_fill_sg(qc);
+
+ return 0;
}
EXPORT_SYMBOL_GPL(ata_bmdma_qc_prep);

@@ -2691,12 +2693,14 @@ EXPORT_SYMBOL_GPL(ata_bmdma_qc_prep);
* LOCKING:
* spin_lock_irqsave(host lock)
*/
-void ata_bmdma_dumb_qc_prep(struct ata_queued_cmd *qc)
+int ata_bmdma_dumb_qc_prep(struct ata_queued_cmd *qc)
{
if (!(qc->flags & ATA_QCFLAG_DMAMAP))
- return;
+ return 0;

ata_bmdma_fill_sg_dumb(qc);
+
+ return 0;
}
EXPORT_SYMBOL_GPL(ata_bmdma_dumb_qc_prep);

diff --git a/drivers/ata/pata_macio.c b/drivers/ata/pata_macio.c
index 57f2ec71cfc3..df402ee4974d 100644
--- a/drivers/ata/pata_macio.c
+++ b/drivers/ata/pata_macio.c
@@ -510,7 +510,7 @@ static int pata_macio_cable_detect(struct ata_port *ap)
return ATA_CBL_PATA40;
}

-static void pata_macio_qc_prep(struct ata_queued_cmd *qc)
+static int pata_macio_qc_prep(struct ata_queued_cmd *qc)
{
unsigned int write = (qc->tf.flags & ATA_TFLAG_WRITE);
struct ata_port *ap = qc->ap;
@@ -523,7 +523,7 @@ static void pata_macio_qc_prep(struct ata_queued_cmd *qc)
__func__, qc, qc->flags, write, qc->dev->devno);

if (!(qc->flags & ATA_QCFLAG_DMAMAP))
- return;
+ return 0;

table = (struct dbdma_cmd *) priv->dma_table_cpu;

@@ -568,6 +568,8 @@ static void pata_macio_qc_prep(struct ata_queued_cmd *qc)
table->command = cpu_to_le16(DBDMA_STOP);

dev_dbgdma(priv->dev, "%s: %d DMA list entries\n", __func__, pi);
+
+ return 0;
}


diff --git a/drivers/ata/pata_pxa.c b/drivers/ata/pata_pxa.c
index 4afcb8e63e21..6fc141440509 100644
--- a/drivers/ata/pata_pxa.c
+++ b/drivers/ata/pata_pxa.c
@@ -44,25 +44,27 @@ static void pxa_ata_dma_irq(void *d)
/*
* Prepare taskfile for submission.
*/
-static void pxa_qc_prep(struct ata_queued_cmd *qc)
+static int pxa_qc_prep(struct ata_queued_cmd *qc)
{
struct pata_pxa_data *pd = qc->ap->private_data;
struct dma_async_tx_descriptor *tx;
enum dma_transfer_direction dir;

if (!(qc->flags & ATA_QCFLAG_DMAMAP))
- return;
+ return 0;

dir = (qc->dma_dir == DMA_TO_DEVICE ? DMA_MEM_TO_DEV : DMA_DEV_TO_MEM);
tx = dmaengine_prep_slave_sg(pd->dma_chan, qc->sg, qc->n_elem, dir,
DMA_PREP_INTERRUPT);
if (!tx) {
ata_dev_err(qc->dev, "prep_slave_sg() failed\n");
- return;
+ return 0;
}
tx->callback = pxa_ata_dma_irq;
tx->callback_param = pd;
pd->dma_cookie = dmaengine_submit(tx);
+
+ return 0;
}

/*
diff --git a/drivers/ata/pdc_adma.c b/drivers/ata/pdc_adma.c
index 52fa8606a25f..c44044baf8e6 100644
--- a/drivers/ata/pdc_adma.c
+++ b/drivers/ata/pdc_adma.c
@@ -116,7 +116,7 @@ static int adma_ata_init_one(struct pci_dev *pdev,
const struct pci_device_id *ent);
static int adma_port_start(struct ata_port *ap);
static void adma_port_stop(struct ata_port *ap);
-static void adma_qc_prep(struct ata_queued_cmd *qc);
+static int adma_qc_prep(struct ata_queued_cmd *qc);
static unsigned int adma_qc_issue(struct ata_queued_cmd *qc);
static int adma_check_atapi_dma(struct ata_queued_cmd *qc);
static void adma_freeze(struct ata_port *ap);
@@ -295,7 +295,7 @@ static int adma_fill_sg(struct ata_queued_cmd *qc)
return i;
}

-static void adma_qc_prep(struct ata_queued_cmd *qc)
+static int adma_qc_prep(struct ata_queued_cmd *qc)
{
struct adma_port_priv *pp = qc->ap->private_data;
u8 *buf = pp->pkt;
@@ -306,7 +306,7 @@ static void adma_qc_prep(struct ata_queued_cmd *qc)

adma_enter_reg_mode(qc->ap);
if (qc->tf.protocol != ATA_PROT_DMA)
- return;
+ return 0;

buf[i++] = 0; /* Response flags */
buf[i++] = 0; /* reserved */
@@ -371,6 +371,7 @@ static void adma_qc_prep(struct ata_queued_cmd *qc)
printk("%s\n", obuf);
}
#endif
+ return 0;
}

static inline void adma_packet_start(struct ata_queued_cmd *qc)
diff --git a/drivers/ata/sata_fsl.c b/drivers/ata/sata_fsl.c
index 8e9cb198fcd1..ccddf0730828 100644
--- a/drivers/ata/sata_fsl.c
+++ b/drivers/ata/sata_fsl.c
@@ -502,7 +502,7 @@ static unsigned int sata_fsl_fill_sg(struct ata_queued_cmd *qc, void *cmd_desc,
return num_prde;
}

-static void sata_fsl_qc_prep(struct ata_queued_cmd *qc)
+static int sata_fsl_qc_prep(struct ata_queued_cmd *qc)
{
struct ata_port *ap = qc->ap;
struct sata_fsl_port_priv *pp = ap->private_data;
@@ -548,6 +548,8 @@ static void sata_fsl_qc_prep(struct ata_queued_cmd *qc)

VPRINTK("SATA FSL : xx_qc_prep, di = 0x%x, ttl = %d, num_prde = %d\n",
desc_info, ttl_dwords, num_prde);
+
+ return 0;
}

static unsigned int sata_fsl_qc_issue(struct ata_queued_cmd *qc)
diff --git a/drivers/ata/sata_inic162x.c b/drivers/ata/sata_inic162x.c
index 790968497dfe..78f5ae2f9b0a 100644
--- a/drivers/ata/sata_inic162x.c
+++ b/drivers/ata/sata_inic162x.c
@@ -478,7 +478,7 @@ static void inic_fill_sg(struct inic_prd *prd, struct ata_queued_cmd *qc)
prd[-1].flags |= PRD_END;
}

-static void inic_qc_prep(struct ata_queued_cmd *qc)
+static int inic_qc_prep(struct ata_queued_cmd *qc)
{
struct inic_port_priv *pp = qc->ap->private_data;
struct inic_pkt *pkt = pp->pkt;
@@ -538,6 +538,8 @@ static void inic_qc_prep(struct ata_queued_cmd *qc)
inic_fill_sg(prd, qc);

pp->cpb_tbl[0] = pp->pkt_dma;
+
+ return 0;
}

static unsigned int inic_qc_issue(struct ata_queued_cmd *qc)
diff --git a/drivers/ata/sata_mv.c b/drivers/ata/sata_mv.c
index da585d2bded6..d6aac7b31c45 100644
--- a/drivers/ata/sata_mv.c
+++ b/drivers/ata/sata_mv.c
@@ -592,8 +592,8 @@ static int mv5_scr_write(struct ata_link *link, unsigned int sc_reg_in, u32 val)
static int mv_port_start(struct ata_port *ap);
static void mv_port_stop(struct ata_port *ap);
static int mv_qc_defer(struct ata_queued_cmd *qc);
-static void mv_qc_prep(struct ata_queued_cmd *qc);
-static void mv_qc_prep_iie(struct ata_queued_cmd *qc);
+static int mv_qc_prep(struct ata_queued_cmd *qc);
+static int mv_qc_prep_iie(struct ata_queued_cmd *qc);
static unsigned int mv_qc_issue(struct ata_queued_cmd *qc);
static int mv_hardreset(struct ata_link *link, unsigned int *class,
unsigned long deadline);
@@ -2031,7 +2031,7 @@ static void mv_rw_multi_errata_sata24(struct ata_queued_cmd *qc)
* LOCKING:
* Inherited from caller.
*/
-static void mv_qc_prep(struct ata_queued_cmd *qc)
+static int mv_qc_prep(struct ata_queued_cmd *qc)
{
struct ata_port *ap = qc->ap;
struct mv_port_priv *pp = ap->private_data;
@@ -2043,15 +2043,15 @@ static void mv_qc_prep(struct ata_queued_cmd *qc)
switch (tf->protocol) {
case ATA_PROT_DMA:
if (tf->command == ATA_CMD_DSM)
- return;
+ return 0;
/* fall-thru */
case ATA_PROT_NCQ:
break; /* continue below */
case ATA_PROT_PIO:
mv_rw_multi_errata_sata24(qc);
- return;
+ return 0;
default:
- return;
+ return 0;
}

/* Fill in command request block
@@ -2116,8 +2116,10 @@ static void mv_qc_prep(struct ata_queued_cmd *qc)
mv_crqb_pack_cmd(cw++, tf->command, ATA_REG_CMD, 1); /* last */

if (!(qc->flags & ATA_QCFLAG_DMAMAP))
- return;
+ return 0;
mv_fill_sg(qc);
+
+ return 0;
}

/**
@@ -2132,7 +2134,7 @@ static void mv_qc_prep(struct ata_queued_cmd *qc)
* LOCKING:
* Inherited from caller.
*/
-static void mv_qc_prep_iie(struct ata_queued_cmd *qc)
+static int mv_qc_prep_iie(struct ata_queued_cmd *qc)
{
struct ata_port *ap = qc->ap;
struct mv_port_priv *pp = ap->private_data;
@@ -2143,9 +2145,9 @@ static void mv_qc_prep_iie(struct ata_queued_cmd *qc)

if ((tf->protocol != ATA_PROT_DMA) &&
(tf->protocol != ATA_PROT_NCQ))
- return;
+ return 0;
if (tf->command == ATA_CMD_DSM)
- return; /* use bmdma for this */
+ return 0; /* use bmdma for this */

/* Fill in Gen IIE command request block */
if (!(tf->flags & ATA_TFLAG_WRITE))
@@ -2186,8 +2188,10 @@ static void mv_qc_prep_iie(struct ata_queued_cmd *qc)
);

if (!(qc->flags & ATA_QCFLAG_DMAMAP))
- return;
+ return 0;
mv_fill_sg(qc);
+
+ return 0;
}

/**
diff --git a/drivers/ata/sata_nv.c b/drivers/ata/sata_nv.c
index 54bfab15c74a..60d842d08f31 100644
--- a/drivers/ata/sata_nv.c
+++ b/drivers/ata/sata_nv.c
@@ -297,7 +297,7 @@ static void nv_ck804_freeze(struct ata_port *ap);
static void nv_ck804_thaw(struct ata_port *ap);
static int nv_adma_slave_config(struct scsi_device *sdev);
static int nv_adma_check_atapi_dma(struct ata_queued_cmd *qc);
-static void nv_adma_qc_prep(struct ata_queued_cmd *qc);
+static int nv_adma_qc_prep(struct ata_queued_cmd *qc);
static unsigned int nv_adma_qc_issue(struct ata_queued_cmd *qc);
static irqreturn_t nv_adma_interrupt(int irq, void *dev_instance);
static void nv_adma_irq_clear(struct ata_port *ap);
@@ -319,7 +319,7 @@ static void nv_mcp55_freeze(struct ata_port *ap);
static void nv_swncq_error_handler(struct ata_port *ap);
static int nv_swncq_slave_config(struct scsi_device *sdev);
static int nv_swncq_port_start(struct ata_port *ap);
-static void nv_swncq_qc_prep(struct ata_queued_cmd *qc);
+static int nv_swncq_qc_prep(struct ata_queued_cmd *qc);
static void nv_swncq_fill_sg(struct ata_queued_cmd *qc);
static unsigned int nv_swncq_qc_issue(struct ata_queued_cmd *qc);
static void nv_swncq_irq_clear(struct ata_port *ap, u16 fis);
@@ -1349,7 +1349,7 @@ static int nv_adma_use_reg_mode(struct ata_queued_cmd *qc)
return 1;
}

-static void nv_adma_qc_prep(struct ata_queued_cmd *qc)
+static int nv_adma_qc_prep(struct ata_queued_cmd *qc)
{
struct nv_adma_port_priv *pp = qc->ap->private_data;
struct nv_adma_cpb *cpb = &pp->cpb[qc->hw_tag];
@@ -1361,7 +1361,7 @@ static void nv_adma_qc_prep(struct ata_queued_cmd *qc)
(qc->flags & ATA_QCFLAG_DMAMAP));
nv_adma_register_mode(qc->ap);
ata_bmdma_qc_prep(qc);
- return;
+ return 0;
}

cpb->resp_flags = NV_CPB_RESP_DONE;
@@ -1393,6 +1393,8 @@ static void nv_adma_qc_prep(struct ata_queued_cmd *qc)
cpb->ctl_flags = ctl_flags;
wmb();
cpb->resp_flags = 0;
+
+ return 0;
}

static unsigned int nv_adma_qc_issue(struct ata_queued_cmd *qc)
@@ -1956,17 +1958,19 @@ static int nv_swncq_port_start(struct ata_port *ap)
return 0;
}

-static void nv_swncq_qc_prep(struct ata_queued_cmd *qc)
+static int nv_swncq_qc_prep(struct ata_queued_cmd *qc)
{
if (qc->tf.protocol != ATA_PROT_NCQ) {
ata_bmdma_qc_prep(qc);
- return;
+ return 0;
}

if (!(qc->flags & ATA_QCFLAG_DMAMAP))
- return;
+ return 0;

nv_swncq_fill_sg(qc);
+
+ return 0;
}

static void nv_swncq_fill_sg(struct ata_queued_cmd *qc)
diff --git a/drivers/ata/sata_promise.c b/drivers/ata/sata_promise.c
index f4dfec3b6e42..ca5780983029 100644
--- a/drivers/ata/sata_promise.c
+++ b/drivers/ata/sata_promise.c
@@ -139,7 +139,7 @@ static int pdc_sata_scr_write(struct ata_link *link, unsigned int sc_reg, u32 va
static int pdc_ata_init_one(struct pci_dev *pdev, const struct pci_device_id *ent);
static int pdc_common_port_start(struct ata_port *ap);
static int pdc_sata_port_start(struct ata_port *ap);
-static void pdc_qc_prep(struct ata_queued_cmd *qc);
+static int pdc_qc_prep(struct ata_queued_cmd *qc);
static void pdc_tf_load_mmio(struct ata_port *ap, const struct ata_taskfile *tf);
static void pdc_exec_command_mmio(struct ata_port *ap, const struct ata_taskfile *tf);
static int pdc_check_atapi_dma(struct ata_queued_cmd *qc);
@@ -633,7 +633,7 @@ static void pdc_fill_sg(struct ata_queued_cmd *qc)
prd[idx - 1].flags_len |= cpu_to_le32(ATA_PRD_EOT);
}

-static void pdc_qc_prep(struct ata_queued_cmd *qc)
+static int pdc_qc_prep(struct ata_queued_cmd *qc)
{
struct pdc_port_priv *pp = qc->ap->private_data;
unsigned int i;
@@ -665,6 +665,8 @@ static void pdc_qc_prep(struct ata_queued_cmd *qc)
default:
break;
}
+
+ return 0;
}

static int pdc_is_sataii_tx4(unsigned long flags)
diff --git a/drivers/ata/sata_qstor.c b/drivers/ata/sata_qstor.c
index 7ec0c216a6a6..16acf7fb10ad 100644
--- a/drivers/ata/sata_qstor.c
+++ b/drivers/ata/sata_qstor.c
@@ -100,7 +100,7 @@ static int qs_scr_write(struct ata_link *link, unsigned int sc_reg, u32 val);
static int qs_ata_init_one(struct pci_dev *pdev, const struct pci_device_id *ent);
static int qs_port_start(struct ata_port *ap);
static void qs_host_stop(struct ata_host *host);
-static void qs_qc_prep(struct ata_queued_cmd *qc);
+static int qs_qc_prep(struct ata_queued_cmd *qc);
static unsigned int qs_qc_issue(struct ata_queued_cmd *qc);
static int qs_check_atapi_dma(struct ata_queued_cmd *qc);
static void qs_freeze(struct ata_port *ap);
@@ -260,7 +260,7 @@ static unsigned int qs_fill_sg(struct ata_queued_cmd *qc)
return si;
}

-static void qs_qc_prep(struct ata_queued_cmd *qc)
+static int qs_qc_prep(struct ata_queued_cmd *qc)
{
struct qs_port_priv *pp = qc->ap->private_data;
u8 dflags = QS_DF_PORD, *buf = pp->pkt;
@@ -272,7 +272,7 @@ static void qs_qc_prep(struct ata_queued_cmd *qc)

qs_enter_reg_mode(qc->ap);
if (qc->tf.protocol != ATA_PROT_DMA)
- return;
+ return 0;

nelem = qs_fill_sg(qc);

@@ -295,6 +295,8 @@ static void qs_qc_prep(struct ata_queued_cmd *qc)

/* frame information structure (FIS) */
ata_tf_to_fis(&qc->tf, 0, 1, &buf[32]);
+
+ return 0;
}

static inline void qs_packet_start(struct ata_queued_cmd *qc)
diff --git a/drivers/ata/sata_rcar.c b/drivers/ata/sata_rcar.c
index 3495e1733a8e..8b0f363c86ac 100644
--- a/drivers/ata/sata_rcar.c
+++ b/drivers/ata/sata_rcar.c
@@ -550,12 +550,14 @@ static void sata_rcar_bmdma_fill_sg(struct ata_queued_cmd *qc)
prd[si - 1].addr |= cpu_to_le32(SATA_RCAR_DTEND);
}

-static void sata_rcar_qc_prep(struct ata_queued_cmd *qc)
+static int sata_rcar_qc_prep(struct ata_queued_cmd *qc)
{
if (!(qc->flags & ATA_QCFLAG_DMAMAP))
- return;
+ return 0;

sata_rcar_bmdma_fill_sg(qc);
+
+ return 0;
}

static void sata_rcar_bmdma_setup(struct ata_queued_cmd *qc)
diff --git a/drivers/ata/sata_sil.c b/drivers/ata/sata_sil.c
index 25b6a52be5ab..a1806a0b3420 100644
--- a/drivers/ata/sata_sil.c
+++ b/drivers/ata/sata_sil.c
@@ -103,7 +103,7 @@ static void sil_dev_config(struct ata_device *dev);
static int sil_scr_read(struct ata_link *link, unsigned int sc_reg, u32 *val);
static int sil_scr_write(struct ata_link *link, unsigned int sc_reg, u32 val);
static int sil_set_mode(struct ata_link *link, struct ata_device **r_failed);
-static void sil_qc_prep(struct ata_queued_cmd *qc);
+static int sil_qc_prep(struct ata_queued_cmd *qc);
static void sil_bmdma_setup(struct ata_queued_cmd *qc);
static void sil_bmdma_start(struct ata_queued_cmd *qc);
static void sil_bmdma_stop(struct ata_queued_cmd *qc);
@@ -317,12 +317,14 @@ static void sil_fill_sg(struct ata_queued_cmd *qc)
last_prd->flags_len |= cpu_to_le32(ATA_PRD_EOT);
}

-static void sil_qc_prep(struct ata_queued_cmd *qc)
+static int sil_qc_prep(struct ata_queued_cmd *qc)
{
if (!(qc->flags & ATA_QCFLAG_DMAMAP))
- return;
+ return 0;

sil_fill_sg(qc);
+
+ return 0;
}

static unsigned char sil_get_device_cache_line(struct pci_dev *pdev)
diff --git a/drivers/ata/sata_sil24.c b/drivers/ata/sata_sil24.c
index bfdf41912588..54ef46067514 100644
--- a/drivers/ata/sata_sil24.c
+++ b/drivers/ata/sata_sil24.c
@@ -326,7 +326,7 @@ static void sil24_dev_config(struct ata_device *dev);
static int sil24_scr_read(struct ata_link *link, unsigned sc_reg, u32 *val);
static int sil24_scr_write(struct ata_link *link, unsigned sc_reg, u32 val);
static int sil24_qc_defer(struct ata_queued_cmd *qc);
-static void sil24_qc_prep(struct ata_queued_cmd *qc);
+static int sil24_qc_prep(struct ata_queued_cmd *qc);
static unsigned int sil24_qc_issue(struct ata_queued_cmd *qc);
static bool sil24_qc_fill_rtf(struct ata_queued_cmd *qc);
static void sil24_pmp_attach(struct ata_port *ap);
@@ -830,7 +830,7 @@ static int sil24_qc_defer(struct ata_queued_cmd *qc)
return ata_std_qc_defer(qc);
}

-static void sil24_qc_prep(struct ata_queued_cmd *qc)
+static int sil24_qc_prep(struct ata_queued_cmd *qc)
{
struct ata_port *ap = qc->ap;
struct sil24_port_priv *pp = ap->private_data;
@@ -874,6 +874,8 @@ static void sil24_qc_prep(struct ata_queued_cmd *qc)

if (qc->flags & ATA_QCFLAG_DMAMAP)
sil24_fill_sg(qc, sge);
+
+ return 0;
}

static unsigned int sil24_qc_issue(struct ata_queued_cmd *qc)
diff --git a/drivers/ata/sata_sx4.c b/drivers/ata/sata_sx4.c
index ae8e374d0a77..4d726dca957a 100644
--- a/drivers/ata/sata_sx4.c
+++ b/drivers/ata/sata_sx4.c
@@ -202,7 +202,7 @@ static void pdc_error_handler(struct ata_port *ap);
static void pdc_freeze(struct ata_port *ap);
static void pdc_thaw(struct ata_port *ap);
static int pdc_port_start(struct ata_port *ap);
-static void pdc20621_qc_prep(struct ata_queued_cmd *qc);
+static int pdc20621_qc_prep(struct ata_queued_cmd *qc);
static void pdc_tf_load_mmio(struct ata_port *ap, const struct ata_taskfile *tf);
static void pdc_exec_command_mmio(struct ata_port *ap, const struct ata_taskfile *tf);
static unsigned int pdc20621_dimm_init(struct ata_host *host);
@@ -530,7 +530,7 @@ static void pdc20621_nodata_prep(struct ata_queued_cmd *qc)
VPRINTK("ata pkt buf ofs %u, mmio copied\n", i);
}

-static void pdc20621_qc_prep(struct ata_queued_cmd *qc)
+static int pdc20621_qc_prep(struct ata_queued_cmd *qc)
{
switch (qc->tf.protocol) {
case ATA_PROT_DMA:
@@ -542,6 +542,8 @@ static void pdc20621_qc_prep(struct ata_queued_cmd *qc)
default:
break;
}
+
+ return 0;
}

static void __pdc20621_push_hdma(struct ata_queued_cmd *qc,
diff --git a/include/linux/libata.h b/include/linux/libata.h
index 207e7ee764ce..76d855244a4d 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -891,9 +891,9 @@ struct ata_port_operations {
/*
* Command execution
*/
- int (*qc_defer)(struct ata_queued_cmd *qc);
- int (*check_atapi_dma)(struct ata_queued_cmd *qc);
- void (*qc_prep)(struct ata_queued_cmd *qc);
+ int (*qc_defer)(struct ata_queued_cmd *qc);
+ int (*check_atapi_dma)(struct ata_queued_cmd *qc);
+ int (*qc_prep)(struct ata_queued_cmd *qc);
unsigned int (*qc_issue)(struct ata_queued_cmd *qc);
bool (*qc_fill_rtf)(struct ata_queued_cmd *qc);

@@ -1161,7 +1161,7 @@ extern int ata_xfer_mode2shift(unsigned long xfer_mode);
extern const char *ata_mode_string(unsigned long xfer_mask);
extern unsigned long ata_id_xfermask(const u16 *id);
extern int ata_std_qc_defer(struct ata_queued_cmd *qc);
-extern void ata_noop_qc_prep(struct ata_queued_cmd *qc);
+extern int ata_noop_qc_prep(struct ata_queued_cmd *qc);
extern void ata_sg_init(struct ata_queued_cmd *qc, struct scatterlist *sg,
unsigned int n_elem);
extern unsigned int ata_dev_classify(const struct ata_taskfile *tf);
@@ -1893,9 +1893,9 @@ extern const struct ata_port_operations ata_bmdma_port_ops;
.sg_tablesize = LIBATA_MAX_PRD, \
.dma_boundary = ATA_DMA_BOUNDARY

-extern void ata_bmdma_qc_prep(struct ata_queued_cmd *qc);
+extern int ata_bmdma_qc_prep(struct ata_queued_cmd *qc);
extern unsigned int ata_bmdma_qc_issue(struct ata_queued_cmd *qc);
-extern void ata_bmdma_dumb_qc_prep(struct ata_queued_cmd *qc);
+extern int ata_bmdma_dumb_qc_prep(struct ata_queued_cmd *qc);
extern unsigned int ata_bmdma_port_intr(struct ata_port *ap,
struct ata_queued_cmd *qc);
extern irqreturn_t ata_bmdma_interrupt(int irq, void *dev_instance);
--
2.22.0