lpfc: Fix scsi prep dma buf error.

[ Upstream commit 5116fbf136ea21b8678a85eee5c03508736ada9f ]

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@avagotech.com>
Signed-off-by: James Smart <james.smart@avagotech.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: James Bottomley <JBottomley@Odin.com>
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>

diff --git a/drivers/scsi/lpfc/lpfc_scsi.c b/drivers/scsi/lpfc/lpfc_scsi.c
index b99399fe25488095d82911e34e8dab82091cb0e6..15acc808658fa6e0dce126b98084205526e20b26 100644 (file)
--- a/drivers/scsi/lpfc/lpfc_scsi.c
+++ b/drivers/scsi/lpfc/lpfc_scsi.c
@@ -3380,7 +3380,7 @@ 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 */