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Subject[patch 11/33] Fix qlogicpti DMA unmapping
-stable review patch.  If anyone has any objections, please let us know.

From: David Miller <>

[SCSI] QLOGICPTI: Do not unmap DMA unless we actually mapped something.

We only map DMA when cmd->request_bufflen is non-zero for non-sg
buffers, we thus should make the same check when unmapping.

Based upon a report from Pasi Pirhonen.

Signed-off-by: David S. Miller <>
Signed-off-by: Greg Kroah-Hartman <>

drivers/scsi/qlogicpti.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/scsi/qlogicpti.c
+++ b/drivers/scsi/qlogicpti.c
@@ -1281,7 +1281,7 @@ static struct scsi_cmnd *qlogicpti_intr_
(struct scatterlist *)Cmnd->request_buffer,
- } else {
+ } else if (Cmnd->request_bufflen) {
(__u32)((unsigned long)Cmnd->SCp.ptr),
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