linux-kernel - Re: [SCSI RFC] mpt2sas: wait_for_completion

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Message-ID: <549EE319.9030702@stratus.com>
Date:	Sat, 27 Dec 2014 11:49:29 -0500
From:	Joe Lawrence <joe.lawrence@...atus.com>
To:	Nicholas Mc Guire <der.herr@...r.at>,
	Nagalakshmi Nandigama <nagalakshmi.nandigama@...gotech.com>
CC:	Praveen Krishnamoorthy <praveen.krishnamoorthy@...gotech.com>,
	Sreekanth Reddy <sreekanth.reddy@...gotech.com>,
	Abhijit Mahajan <abhijit.mahajan@...gotech.com>,
	"James E.J. Bottomley" <JBottomley@...allels.com>,
	<MPT-FusionLinux.pdl@...gotech.com>, <linux-scsi@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [SCSI RFC] mpt2sas: wait_for_completion_timeout timeout not reported

On 12/29/2014 12:25 PM, Nicholas Mc Guire wrote:
> wait_for_completion_timeout reaching timeout was being ignored,
> this probably also should fail if timeout condition occurs ?
> 
> this was only compile tested with
> x86_64_defconfig + CONFIG_SCSI_LOWLEVEL=y + CONFIG_SCSI_MPT2SAS=m
> 
> patch is against linux-next 3.19.0-rc1 -next-20141226
> 
> Signed-off-by: Nicholas Mc Guire <der.herr@...r.at>
> ---
>  drivers/scsi/mpt2sas/mpt2sas_config.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/scsi/mpt2sas/mpt2sas_config.c b/drivers/scsi/mpt2sas/mpt2sas_config.c
> index c72a2ff..02dc2d8 100644
> --- a/drivers/scsi/mpt2sas/mpt2sas_config.c
> +++ b/drivers/scsi/mpt2sas/mpt2sas_config.c
> @@ -391,7 +391,7 @@ _config_request(struct MPT2SAS_ADAPTER *ioc, Mpi2ConfigRequest_t
>  	mpt2sas_base_put_smid_default(ioc, smid);
>  	timeleft = wait_for_completion_timeout(&ioc->config_cmds.done,
>  	    timeout*HZ);
> -	if (!(ioc->config_cmds.status & MPT2_CMD_COMPLETE)) {
> +	if (timeleft == 0 || !(ioc->config_cmds.status & MPT2_CMD_COMPLETE)) {
>  		printk(MPT2SAS_ERR_FMT "%s: timeout\n",
>  		    ioc->name, __func__);
>  		_debug_dump_mf(mpi_request,
> 

Hi Nicholas,

This would look like the correct thing to do here, for it eliminates a
small window where we timeout when mpt2sas_config_done had set
MPT2_CMD_COMPLETE and MPT3_CMD_REPLY_VALID, but has not finished copying
the reply data into config_cmds.reply.

It looks like the same patch should be applied to the mpt3sas driver as
well.

-- Joe
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