Re: [patch] qla2xxx: fix a timeout loop

[Martin K. Petersen]

> "Dan" == Dan Carpenter  writes:

Dan> The qlogic devs asked me to redo this patch but you have already
Dan> applied it.  Should I resend or redo it on top of the earlier
Dan> patch.  (James's tree was rebaseable for a day after a patch was
Dan> "applied".)

I dropped it for now.

-- 
Martin K. Petersen  Oracle Linux Engineering
--
To unsubscribe from this list: send the line "unsubscribe linux-scsi" in
the body of a message to majord...@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html

Re: [patch] qla2xxx: fix a timeout loop

[Dan Carpenter]

On Wed, Dec 16, 2015 at 05:50:17PM -0500, Martin K. Petersen wrote:
> > "Dan" == Dan Carpenter  writes:
> 
> Dan> After the loop we test for "if (!retries) " as a failure, but
> Dan> actually the post-op here will end with retries set to -1.  I have
> Dan> fixed this by using a pre-op instead.
> 
> Applied to 4.4/scsi-fixes.
> 

The qlogic devs asked me to redo this patch but you have already applied
it.  Should I resend or redo it on top of the earlier patch.  (James's
tree was rebaseable for a day after a patch was "applied".)

regards,
dan carpenter

--
To unsubscribe from this list: send the line "unsubscribe linux-scsi" in
the body of a message to majord...@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html

Re: [patch] qla2xxx: fix a timeout loop

[Martin K. Petersen]

> "Dan" == Dan Carpenter  writes:

Dan> After the loop we test for "if (!retries) " as a failure, but
Dan> actually the post-op here will end with retries set to -1.  I have
Dan> fixed this by using a pre-op instead.

Applied to 4.4/scsi-fixes.

-- 
Martin K. Petersen  Oracle Linux Engineering
--
To unsubscribe from this list: send the line "unsubscribe linux-scsi" in
the body of a message to majord...@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html

Re: [patch] qla2xxx: fix a timeout loop

[Himanshu Madhani]

Hi Dan, 


On 12/16/15, 3:07 AM, "linux-scsi-ow...@vger.kernel.org on behalf of Dan
Carpenter"  wrote:

>After the loop we test for "if (!retries) " as a failure, but actually
>the post-op here will end with retries set to -1.  I have fixed this by
>using a pre-op instead.
>
>Fixes: 7ec0effd30bb ('[SCSI] qla2xxx: Add support for ISP8044.')
>Signed-off-by: Dan Carpenter 
>
>diff --git a/drivers/scsi/qla2xxx/qla_nx2.c
>b/drivers/scsi/qla2xxx/qla_nx2.c
>index 007192d..66d629e 100644
>--- a/drivers/scsi/qla2xxx/qla_nx2.c
>+++ b/drivers/scsi/qla2xxx/qla_nx2.c
>@@ -3491,7 +3491,7 @@ qla8044_poll_flash_status_reg(struct scsi_qla_host
>*vha)
>   int retries = QLA8044_FLASH_READ_RETRY_COUNT;
>   int ret_val = QLA_SUCCESS;
> 
>-  while (retries--) {
>+  while (--retries) {
>   ret_val = qla8044_rd_reg_indirect(vha, QLA8044_FLASH_STATUS,
>   _status);
>   if (ret_val) {

There is flaw in this pre-decrement logic here for following 2 reasons
1. The pre-decrement reduces the total number of retries by one
2. If the retries is already Zero, then the pre-decrement would cause loop
to iterate for a very large number of times.

The correct fix for this would be to change the if(!retries) to if
(retries == -1) or if (retries < 0)

We¹ll send a follow up patch to fix this.

Thanks,
Himanshu
>--
>To unsubscribe from this list: send the line "unsubscribe linux-scsi" in
>the body of a message to majord...@vger.kernel.org
>More majordomo info at  http://vger.kernel.org/majordomo-info.html

<>

Re: [patch] qla2xxx: fix a timeout loop

[Johannes Thumshirn]

On Wed, Dec 16, 2015 at 02:07:46PM +0300, Dan Carpenter wrote:
> After the loop we test for "if (!retries) " as a failure, but actually
> the post-op here will end with retries set to -1.  I have fixed this by
> using a pre-op instead.
> 
> Fixes: 7ec0effd30bb ('[SCSI] qla2xxx: Add support for ISP8044.')
> Signed-off-by: Dan Carpenter 
> 
> diff --git a/drivers/scsi/qla2xxx/qla_nx2.c b/drivers/scsi/qla2xxx/qla_nx2.c
> index 007192d..66d629e 100644
> --- a/drivers/scsi/qla2xxx/qla_nx2.c
> +++ b/drivers/scsi/qla2xxx/qla_nx2.c
> @@ -3491,7 +3491,7 @@ qla8044_poll_flash_status_reg(struct scsi_qla_host *vha)
>   int retries = QLA8044_FLASH_READ_RETRY_COUNT;
>   int ret_val = QLA_SUCCESS;
>  
> - while (retries--) {
> + while (--retries) {
>   ret_val = qla8044_rd_reg_indirect(vha, QLA8044_FLASH_STATUS,
>   _status);
>   if (ret_val) {
> --
> To unsubscribe from this list: send the line "unsubscribe linux-scsi" in
> the body of a message to majord...@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html

Good catch.

Reviewed-by: Johannes Thumshirn 

-- 
Johannes Thumshirn  Storage
jthumsh...@suse.de+49 911 74053 689
SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg
GF: Felix Imendörffer, Jane Smithard, Graham Norton
HRB 21284 (AG Nürnberg)
Key fingerprint = EC38 9CAB C2C4 F25D 8600 D0D0 0393 969D 2D76 0850
--
To unsubscribe from this list: send the line "unsubscribe linux-scsi" in
the body of a message to majord...@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html