* [PATCH 2/5] staging: hv: Fixed lockup problem with bounce_buffer scatter list
@ 2010-08-05 19:29 Hank Janssen
2010-08-30 23:49 ` Greg KH
0 siblings, 1 reply; 2+ messages in thread
From: Hank Janssen @ 2010-08-05 19:29 UTC (permalink / raw)
To: 'linux-kernel@vger.kernel.org',
'devel@driverdev.osuosl.org',
'virtualization@lists.osdl.org'
Cc: Haiyang Zhang, 'gregkh@suse.de'
From: Hank Janssen <hjanssen@microsoft.com>
Fixed lockup problem with bounce_buffer scatter list which caused
crashes in heavy loads. Under heavy loads with many clients we this
problem appear, it causes a kernel Panic.
Signed-off-by:Hank Janssen <hjanssen@microsoft.com>
Signed-off-by:Haiyang Zhang <haiyangz@microsoft.com>
Cc: stable <stable@kernel.org>
---
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
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH 2/5] staging: hv: Fixed lockup problem with bounce_buffer scatter list
2010-08-05 19:29 [PATCH 2/5] staging: hv: Fixed lockup problem with bounce_buffer scatter list Hank Janssen
@ 2010-08-30 23:49 ` Greg KH
0 siblings, 0 replies; 2+ messages in thread
From: Greg KH @ 2010-08-30 23:49 UTC (permalink / raw)
To: Hank Janssen
Cc: 'linux-kernel@vger.kernel.org',
'devel@driverdev.osuosl.org',
'virtualization@lists.osdl.org',
Haiyang Zhang, 'gregkh@suse.de'
On Thu, Aug 05, 2010 at 07:29:53PM +0000, Hank Janssen wrote:
> From: Hank Janssen <hjanssen@microsoft.com>
>
> Fixed lockup problem with bounce_buffer scatter list which caused
> crashes in heavy loads. Under heavy loads with many clients we this
> problem appear, it causes a kernel Panic.
>
> Signed-off-by:Hank Janssen <hjanssen@microsoft.com>
> Signed-off-by:Haiyang Zhang <haiyangz@microsoft.com>
> Cc: stable <stable@kernel.org>
> ---
> 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);
This patch is corrupted. It applies, but doesn't do what you want it to
do :(
Care to resend?
thanks,
greg k-h
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