From: Hank Janssen Date: Wed, 1 Sep 2010 18:10:41 +0000 (-0700) Subject: staging: hv: Fixed lockup problem with bounce_buffer scatter list X-Git-Tag: v2.6.35.5~100 X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=eddbe634c915e5243906558cd091a00988b86b00;p=karo-tx-linux.git staging: hv: Fixed lockup problem with bounce_buffer scatter list commit 77c5ceaff31645ea049c6706b99e699eae81fb88 upstream. 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 Signed-off-by: Haiyang Zhang Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/staging/hv/storvsc_drv.c b/drivers/staging/hv/storvsc_drv.c index 062519a09b7d..c1ba458ca79a 100644 --- a/drivers/staging/hv/storvsc_drv.c +++ b/drivers/staging/hv/storvsc_drv.c @@ -646,6 +646,7 @@ static int storvsc_queuecommand(struct scsi_cmnd *scmnd, unsigned int request_size = 0; int i; struct scatterlist *sgl; + unsigned int sg_count = 0; DPRINT_ENTER(STORVSC_DRV); @@ -730,6 +731,7 @@ 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) { @@ -764,15 +766,16 @@ 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]))); + page_to_pfn(sg_page((&sgl[i]))); } } else if (scsi_sglist(scmnd)) { /* ASSERT(scsi_bufflen(scmnd) <= PAGE_SIZE); */