[PATCH] ibmvscsis: Fix srp_transfer_data fail return code

[PATCH] ibmvscsis: Fix srp_transfer_data fail return code

[Bryant G. Ly]

From: "Bryant G. Ly" <bgly@us.ibm.com>

If srp_transfer_data fails within ibmvscsis_write_pending, then
the most likely scenario is that the client timed out the op and
removed the TCE mapping. Thus it will loop forever retrying the
op that is pretty much guaranteed to fail forever. A better return
code would be EIO instead of EAGAIN.

Cc: stable@vger.kernel.org
Reported-by: Steven Royer <seroyer@linux.vnet.ibm.com>
Tested-by: Steven Royer <seroyer@linux.vnet.ibm.com>
Signed-off-by: Bryant G. Ly <bgly@us.ibm.com>
---
 drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.c b/drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.c
index 3d3768a..8fb5c54 100644
--- a/drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.c
+++ b/drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.c
@@ -3585,7 +3585,7 @@ static int ibmvscsis_write_pending(struct se_cmd *se_cmd)
 			       1, 1);
 	if (rc) {
 		pr_err("srp_transfer_data() failed: %d\n", rc);
-		return -EAGAIN;
+		return -EIO;
 	}
 	/*
 	 * We now tell TCM to add this WRITE CDB directly into the TCM storage
-- 
2.5.4 (Apple Git-61)

Re: [PATCH] ibmvscsis: Fix srp_transfer_data fail return code

[Greg KH]

On Mon, Jan 09, 2017 at 10:21:20AM -0600, Bryant G. Ly wrote:
> From: "Bryant G. Ly" <bgly@us.ibm.com>
> 
> If srp_transfer_data fails within ibmvscsis_write_pending, then
> the most likely scenario is that the client timed out the op and
> removed the TCE mapping. Thus it will loop forever retrying the
> op that is pretty much guaranteed to fail forever. A better return
> code would be EIO instead of EAGAIN.
> 
> Cc: stable@vger.kernel.org
> Reported-by: Steven Royer <seroyer@linux.vnet.ibm.com>
> Tested-by: Steven Royer <seroyer@linux.vnet.ibm.com>
> Signed-off-by: Bryant G. Ly <bgly@us.ibm.com>
> ---
>  drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

Why are you sending this to me?

confused,

greg k-h

Re: [PATCH] ibmvscsis: Fix srp_transfer_data fail return code

[Bryant G. Ly]

On 1/9/17 10:47 AM, Greg KH wrote:

> On Mon, Jan 09, 2017 at 10:21:20AM -0600, Bryant G. Ly wrote:
>> From: "Bryant G. Ly" <bgly@us.ibm.com>
>>
>> If srp_transfer_data fails within ibmvscsis_write_pending, then
>> the most likely scenario is that the client timed out the op and
>> removed the TCE mapping. Thus it will loop forever retrying the
>> op that is pretty much guaranteed to fail forever. A better return
>> code would be EIO instead of EAGAIN.
>>
>> Cc: stable@vger.kernel.org
>> Reported-by: Steven Royer <seroyer@linux.vnet.ibm.com>
>> Tested-by: Steven Royer <seroyer@linux.vnet.ibm.com>
>> Signed-off-by: Bryant G. Ly <bgly@us.ibm.com>
>> ---
>>   drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.c | 2 +-
>>   1 file changed, 1 insertion(+), 1 deletion(-)
> Why are you sending this to me?
>
> confused,
>
> greg k-h
Sorry I meant to put --to target-devel@vger.kernel.org, and just --cc you.

-Bryant

Re: [PATCH] ibmvscsis: Fix srp_transfer_data fail return code

[Greg KH]

On Mon, Jan 09, 2017 at 11:23:23AM -0600, Bryant G. Ly wrote:
> On 1/9/17 10:47 AM, Greg KH wrote:
> 
> > On Mon, Jan 09, 2017 at 10:21:20AM -0600, Bryant G. Ly wrote:
> > > From: "Bryant G. Ly" <bgly@us.ibm.com>
> > > 
> > > If srp_transfer_data fails within ibmvscsis_write_pending, then
> > > the most likely scenario is that the client timed out the op and
> > > removed the TCE mapping. Thus it will loop forever retrying the
> > > op that is pretty much guaranteed to fail forever. A better return
> > > code would be EIO instead of EAGAIN.
> > > 
> > > Cc: stable@vger.kernel.org
> > > Reported-by: Steven Royer <seroyer@linux.vnet.ibm.com>
> > > Tested-by: Steven Royer <seroyer@linux.vnet.ibm.com>
> > > Signed-off-by: Bryant G. Ly <bgly@us.ibm.com>
> > > ---
> > >   drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.c | 2 +-
> > >   1 file changed, 1 insertion(+), 1 deletion(-)
> > Why are you sending this to me?
> > 
> > confused,
> > 
> > greg k-h
> Sorry I meant to put --to target-devel@vger.kernel.org, and just --cc you.

Why even cc: me?

Re: [PATCH] ibmvscsis: Fix srp_transfer_data fail return code

[Bart Van Assche]

On Mon, 2017-01-09 at 10:21 -0600, Bryant G. Ly wrote:
> From: "Bryant G. Ly" <bgly@us.ibm.com>
> 
> If srp_transfer_data fails within ibmvscsis_write_pending, then
> the most likely scenario is that the client timed out the op and
> removed the TCE mapping. Thus it will loop forever retrying the
> op that is pretty much guaranteed to fail forever. A better return
> code would be EIO instead of EAGAIN.
> 
> Cc: stable@vger.kernel.org
> Reported-by: Steven Royer <seroyer@linux.vnet.ibm.com>
> Tested-by: Steven Royer <seroyer@linux.vnet.ibm.com>
> Signed-off-by: Bryant G. Ly <bgly@us.ibm.com>
> ---
>  drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.c b/drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.c
> index 3d3768a..8fb5c54 100644
> --- a/drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.c
> +++ b/drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.c
> @@ -3585,7 +3585,7 @@ static int ibmvscsis_write_pending(struct se_cmd *se_cmd)
>  			       1, 1);
>  	if (rc) {
>  		pr_err("srp_transfer_data() failed: %d\n", rc);
> -		return -EAGAIN;
> +		return -EIO;
>  	}
>  	/*
>  	 * We now tell TCM to add this WRITE CDB directly into the TCM storage

Using the "Cc: stable@vger.kernel.org" tag is fine but please do not
add stable@vger.kernel.org to the CC-list of the e-mail header. Anyway,
thanks for the patch. It has been applied on my for-v4.10 branch.

Bart.