[patch 11/33] Fix qlogicpti DMA unmapping

[Greg KH]

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

------------------
From: David Miller <davem@xxxxxxxxxxxxx>

[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 <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>

---
 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,
 				      Cmnd->use_sg,
 				      Cmnd->sc_data_direction);
-		} else {
+		} else if (Cmnd->request_bufflen) {
 			sbus_unmap_single(qpti->sdev,
 					  (__u32)((unsigned long)Cmnd->SCp.ptr),
 					  Cmnd->request_bufflen,

-- 
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