[PATCH] libata: make ata_qc_issue complete failed qcs

There is no reason for the issuer to diddle with a failed qc as the
issuer has complete control over when a qc gets freed (usually in
->complete_fn).  Make ata_qc_issue() responsible for completing qcs
which failed to issue.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

3 files changed, 12 insertions, 18 deletions

diff --git a/drivers/scsi/libata-core.c b/drivers/scsi/libata-core.c
index eb4df01d9fa0..63ae23b5c078 100644
--- a/drivers/scsi/libata-core.c
+++ b/drivers/scsi/libata-core.c
@@ -989,9 +989,7 @@ ata_exec_internal(struct ata_port *ap, struct ata_device *dev,
         qc->private_data = &wait;
         qc->complete_fn = ata_qc_complete_internal;
 
-        qc->err_mask = ata_qc_issue(qc);
-        if (qc->err_mask)
-                ata_qc_complete(qc);
+        ata_qc_issue(qc);
 
         spin_unlock_irqrestore(&ap->host_set->lock, flags);
 
@@ -3997,12 +3995,8 @@ static inline int ata_should_dma_map(struct ata_queued_cmd *qc)
  *
  *      LOCKING:
  *      spin_lock_irqsave(host_set lock)
- *
- *      RETURNS:
- *      Zero on success, AC_ERR_* mask on failure
  */
-
-unsigned int ata_qc_issue(struct ata_queued_cmd *qc)
+void ata_qc_issue(struct ata_queued_cmd *qc)
 {
         struct ata_port *ap = qc->ap;
 
@@ -4023,14 +4017,18 @@ unsigned int ata_qc_issue(struct ata_queued_cmd *qc)
 
         ap->ops->qc_prep(qc);
 
-        return ap->ops->qc_issue(qc);
+        qc->err_mask |= ap->ops->qc_issue(qc);
+        if (unlikely(qc->err_mask))
+                goto err;
+        return;
 
 sg_err:
         qc->flags &= ~ATA_QCFLAG_DMAMAP;
-        return AC_ERR_SYSTEM;
+        qc->err_mask |= AC_ERR_SYSTEM;
+err:
+        ata_qc_complete(qc);
 }
 
-
 /**
  *      ata_qc_issue_prot - issue taskfile to device in proto-dependent manner
  *      @qc: command to issue to device
diff --git a/drivers/scsi/libata-scsi.c b/drivers/scsi/libata-scsi.c
index 628191bfd990..53f5b0d9161c 100644
--- a/drivers/scsi/libata-scsi.c
+++ b/drivers/scsi/libata-scsi.c
@@ -1431,9 +1431,7 @@ static void ata_scsi_translate(struct ata_port *ap, struct ata_device *dev,
                 goto early_finish;
 
         /* select device, send command to hardware */
-        qc->err_mask = ata_qc_issue(qc);
-        if (qc->err_mask)
-                ata_qc_complete(qc);
+        ata_qc_issue(qc);
 
         VPRINTK("EXIT\n");
         return;
@@ -2199,9 +2197,7 @@ static void atapi_request_sense(struct ata_queued_cmd *qc)
 
         qc->complete_fn = atapi_sense_complete;
 
-        qc->err_mask = ata_qc_issue(qc);
-        if (qc->err_mask)
-                ata_qc_complete(qc);
+        ata_qc_issue(qc);
 
         DPRINTK("EXIT\n");
 }
diff --git a/drivers/scsi/libata.h b/drivers/scsi/libata.h
index 65f52beea884..1c755b14521a 100644
--- a/drivers/scsi/libata.h
+++ b/drivers/scsi/libata.h
@@ -47,7 +47,7 @@ extern struct ata_queued_cmd *ata_qc_new_init(struct ata_port *ap,
 extern int ata_rwcmd_protocol(struct ata_queued_cmd *qc);
 extern void ata_port_flush_task(struct ata_port *ap);
 extern void ata_qc_free(struct ata_queued_cmd *qc);
-extern unsigned int ata_qc_issue(struct ata_queued_cmd *qc);
+extern void ata_qc_issue(struct ata_queued_cmd *qc);
 extern int ata_check_atapi_dma(struct ata_queued_cmd *qc);
 extern void ata_dev_select(struct ata_port *ap, unsigned int device,
                            unsigned int wait, unsigned int can_sleep);