[PATCH 3.12 26/33] lpfc: Fix scsi prep dma buf error.

[Jiri Slaby]

From: James Smart <james.smart@xxxxxxxxxxxxx>

3.12-stable review patch.  If anyone has any objections, please let me know.

===============

commit 5116fbf136ea21b8678a85eee5c03508736ada9f upstream.

Didn't check for less-than-or-equal zero. Means we may later call
scsi_dma_unmap() even though we don't have valid mappings.

Signed-off-by: Dick Kennedy <dick.kennedy@xxxxxxxxxxxxx>
Signed-off-by: James Smart <james.smart@xxxxxxxxxxxxx>
Reviewed-by: Hannes Reinecke <hare@xxxxxxx>
Signed-off-by: James Bottomley <JBottomley@xxxxxxxx>
Signed-off-by: Jiri Slaby <jslaby@xxxxxxx>
---
 drivers/scsi/lpfc/lpfc_scsi.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/scsi/lpfc/lpfc_scsi.c b/drivers/scsi/lpfc/lpfc_scsi.c
index c913e8cc3b26..ed7759980c47 100644
--- a/drivers/scsi/lpfc/lpfc_scsi.c
+++ b/drivers/scsi/lpfc/lpfc_scsi.c
@@ -3423,7 +3423,7 @@ lpfc_scsi_prep_dma_buf_s4(struct lpfc_hba *phba, struct lpfc_scsi_buf *lpfc_cmd)
 		 */
 
 		nseg = scsi_dma_map(scsi_cmnd);
-		if (unlikely(!nseg))
+		if (unlikely(nseg <= 0))
 			return 1;
 		sgl += 1;
 		/* clear the last flag in the fcp_rsp map entry */
-- 
2.5.2

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