linux-kernel - RE: [PATCH] qla4xxx: pass timeout as HZ independent value

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Date:	Mon, 8 Jun 2015 06:22:17 +0000
From:	Nilesh Javali <nilesh.javali@...gic.com>
To:	Nicholas Mc Guire <hofrat@...dl.org>,
	Dept-Eng QLogic Storage Upstream 
	<QLogic-Storage-Upstream@...gic.com>
CC:	"James E.J. Bottomley" <JBottomley@...n.com>,
	linux-scsi <linux-scsi@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] qla4xxx: pass timeout as HZ independent value


> -----Original Message-----
> From: Nicholas Mc Guire [mailto:hofrat@...dl.org]
> Sent: Thursday, May 28, 2015 1:40 AM
> To: Dept-Eng QLogic Storage Upstream
> Cc: James E.J. Bottomley; linux-scsi; linux-kernel; Nicholas Mc Guire
> Subject: [PATCH] qla4xxx: pass timeout as HZ independent value
> 
> schedule_timeout_* takes a timeout in jiffies but the code currently is
> passing in a constant which makes this timeout HZ dependent, so pass it
> through msecs_to_jiffies() to fix this up.
> 
> patch was compile tested with x86_64_defconfig + SCSI_LOWLEVEL=y,
> CONFIG_SCSI_QLA_ISCSI=m
> 
> Patch is against 4.1-rc5 (localversion-next is -next-20150527)
> 
> Signed-off-by: Nicholas Mc Guire <hofrat@...dl.org>
> ---
> 
> As there is no documentation of the intended timeout it might be wrong to
> convert it with msecs_to_jiffies as this can reduces the actual jiffies value by
> at least a factor of 10 - so someone that knows this driver needs to check on
> the actual value - but in any case it needs to be passed in a HZ independent
> way.
> 
>  drivers/scsi/qla4xxx/ql4_nx.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/scsi/qla4xxx/ql4_nx.c b/drivers/scsi/qla4xxx/ql4_nx.c
> index 7c33658..7b53eab 100644
> --- a/drivers/scsi/qla4xxx/ql4_nx.c
> +++ b/drivers/scsi/qla4xxx/ql4_nx.c
> @@ -1569,7 +1569,7 @@ static int qla4_82xx_cmdpeg_ready(struct
> scsi_qla_host *ha, int pegtune_val)
>  			    (val == PHAN_INITIALIZE_ACK))
>  				return 0;
>  			set_current_state(TASK_UNINTERRUPTIBLE);
> -			schedule_timeout(500);
> +			schedule_timeout(msecs_to_jiffies(500));
> 
>  		} while (--retries);
> 
> --
> 1.7.10.4

Acked-by: Nilesh Javali <nilesh.javali@...gic.com>
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