linux-kernel - [PATCH 2/5] staging: hv: Fixed lockup problem with bounce_buffer scatter list

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Message-ID: <4C7E9721.2050405@sailtheuniverse.com>
Date:	Wed, 01 Sep 2010 11:10:41 -0700
From:	Hank Janssen <hjanssen@...ltheuniverse.com>
To:	hjanssen@...rosoft.com, gregkh@...e.de, devel@...verdev.osuosl.org,
	virtualization@...ts.osdl.org, linux-kernel@...r.kernel.org,
	Haiyang Zhang <haiyangz@...rosoft.com>
CC:	Joe Perches <joe@...ches.com>
Subject: [PATCH 2/5] staging: hv: Fixed lockup problem with bounce_buffer
 scatter list - Cleaned up



Fixed lockup problem with bounce_buffer scatter list which caused 
crashes in heavy loads. And minor code indentation cleanup in effected
area. 

Removed whitespace and noted minor indentation changes in description as 
pointed out by Joe Perches. (Thanks for reviewing Joe)

Signed-off-by:Hank Janssen <hjanssen@...rosoft.com
Signed-off-by:Haiyang Zhang <haiyangz@...rosoft.com

---
 drivers/staging/hv/storvsc_drv.c |    9 ++++++---
 1 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/staging/hv/storvsc_drv.c b/drivers/staging/hv/storvsc_drv.c
index 3b9ccb0..169d701 100644
--- a/drivers/staging/hv/storvsc_drv.c
+++ b/drivers/staging/hv/storvsc_drv.c
@@ -615,6 +615,7 @@ static int storvsc_queuecommand(struct scsi_cmnd *scmnd,
 	unsigned int request_size = 0;
 	int i;
 	struct scatterlist *sgl;
+	unsigned int sg_count = 0;
 
 	DPRINT_DBG(STORVSC_DRV, "scmnd %p dir %d, use_sg %d buf %p len %d "
 		   "queue depth %d tagged %d", scmnd, scmnd->sc_data_direction,
@@ -697,6 +698,7 @@ static int storvsc_queuecommand(struct scsi_cmnd *scmnd,
 	request->DataBuffer.Length = scsi_bufflen(scmnd);
 	if (scsi_sg_count(scmnd)) {
 		sgl = (struct scatterlist *)scsi_sglist(scmnd);
+		sg_count = scsi_sg_count(scmnd);
 
 		/* check if we need to bounce the sgl */
 		if (do_bounce_buffer(sgl, scsi_sg_count(scmnd)) != -1) {
@@ -731,15 +733,16 @@ static int storvsc_queuecommand(struct scsi_cmnd *scmnd,
 					      scsi_sg_count(scmnd));
 
 			sgl = cmd_request->bounce_sgl;
+			sg_count = cmd_request->bounce_sgl_count;
 		}
 
 		request->DataBuffer.Offset = sgl[0].offset;
 
-		for (i = 0; i < scsi_sg_count(scmnd); i++) {
+		for (i = 0; i < sg_count; i++) {
 			DPRINT_DBG(STORVSC_DRV, "sgl[%d] len %d offset %d\n",
 				   i, sgl[i].length, sgl[i].offset);
-			request->DataBuffer.PfnArray[i] =
-					page_to_pfn(sg_page((&sgl[i])));
+			request->DataBuffer.PfnArray[i] =
+				page_to_pfn(sg_page((&sgl[i])));
 		}
 	} else if (scsi_sglist(scmnd)) {
 		/* ASSERT(scsi_bufflen(scmnd) <= PAGE_SIZE); */
-- 
1.6.0.2

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