[PATCH] libata: fix ata_qc_issue() error handling

When ata_qc_issue() fails, the qc might have been dma mapped or not.
So, performing only ata_qc_free() results in dma map leak.  This patch
makes ata_qc_issue() mark dma map flags correctly on failure and calls
ata_qc_complete() after ata_qc_issue() fails.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>

1 files changed, 8 insertions, 10 deletions

diff --git a/drivers/scsi/libata-core.c b/drivers/scsi/libata-core.c
index 15df633521d0..43a23286d6fe 100644
--- a/drivers/scsi/libata-core.c
+++ b/drivers/scsi/libata-core.c
@@ -1125,8 +1125,10 @@ ata_exec_internal(struct ata_port *ap, struct ata_device *dev,
         qc->private_data = &wait;
         qc->complete_fn = ata_qc_complete_internal;
 
-        if (ata_qc_issue(qc))
-                goto issue_fail;
+        if (ata_qc_issue(qc)) {
+                qc->err_mask = AC_ERR_OTHER;
+                ata_qc_complete(qc);
+        }
 
         spin_unlock_irqrestore(&ap->host_set->lock, flags);
 
@@ -1155,11 +1157,6 @@ ata_exec_internal(struct ata_port *ap, struct ata_device *dev,
         ata_qc_free(qc);
 
         return err_mask;
-
- issue_fail:
-        ata_qc_free(qc);
-        spin_unlock_irqrestore(&ap->host_set->lock, flags);
-        return AC_ERR_OTHER;
 }
 
 /**
@@ -3687,10 +3684,10 @@ int ata_qc_issue(struct ata_queued_cmd *qc)
         if (ata_should_dma_map(qc)) {
                 if (qc->flags & ATA_QCFLAG_SG) {
                         if (ata_sg_setup(qc))
-                                goto err_out;
+                                goto sg_err;
                 } else if (qc->flags & ATA_QCFLAG_SINGLE) {
                         if (ata_sg_setup_one(qc))
-                                goto err_out;
+                                goto sg_err;
                 }
         } else {
                 qc->flags &= ~ATA_QCFLAG_DMAMAP;
@@ -3703,7 +3700,8 @@ int ata_qc_issue(struct ata_queued_cmd *qc)
 
         return ap->ops->qc_issue(qc);
 
-err_out:
+sg_err:
+        qc->flags &= ~ATA_QCFLAG_DMAMAP;
         return -1;
 }