From: David S. Miller <davem@sunset.davemloft.net>
Date: Sat, 14 Apr 2007 17:29:10 +0000 (-0700)
Subject: [SCSI] QLOGICPTI: Do not unmap DMA unless we actually mapped something.
X-Git-Tag: v2.6.21-rc7~7^2
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8d3ee2cb0ab59f78fdc801ede7db15ef47387bd0;p=linux-2.6

[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@davemloft.net>
---

diff --git a/drivers/scsi/qlogicpti.c b/drivers/scsi/qlogicpti.c
index 9b827ceec5..9f10689905 100644
--- a/drivers/scsi/qlogicpti.c
+++ b/drivers/scsi/qlogicpti.c
@@ -1281,7 +1281,7 @@ static struct scsi_cmnd *qlogicpti_intr_handler(struct qlogicpti *qpti)
 				      (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,