Re: [PATCH 2/4] mvsas: Deadlocks meet when TMF tasks issue

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On Fri, 2009-05-08 at 14:16 +0800, Ying Chu wrote:
> >From 58f754f51fced4a39adcf708319e3de946a0d61a Mon Sep 17 00:00:00 2001
> From: Andy <ayan@xxxxxxxxxxx>
> Date: Mon, 4 May 2009 23:31:43 +0800
> Subject: [PATCH 2/4] bug fix: deal lock 
> 
> TMF task need be issued with Interrupt Disabled, or Deadlock may take place.
> 
> Signed-off-by: Ying Chu <jasonchu@xxxxxxxxxxx>
> Signed-off-by: Andy Yan <ayan@xxxxxxxxxxx>
> Signed-off-by: Ke Wei <kewei@xxxxxxxxxxx>
> ---
>  drivers/scsi/mvsas/mv_sas.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/drivers/scsi/mvsas/mv_sas.c b/drivers/scsi/mvsas/mv_sas.c
> index 318ec01..cb002ef 100644
> --- a/drivers/scsi/mvsas/mv_sas.c
> +++ b/drivers/scsi/mvsas/mv_sas.c
> @@ -1446,7 +1446,7 @@ static int mvs_exec_internal_tmf_task(struct domain_device *dev,
>  		task->timer.expires = jiffies + MVS_TASK_TIMEOUT*HZ;
>  		add_timer(&task->timer);
>  
> -		res = mvs_task_exec(task, 1, GFP_KERNEL, NULL, 0, 1, tmf);
> +		res = mvs_task_exec(task, 1, GFP_KERNEL, NULL, 1, 1, tmf);

That eliminates the last user of the unlocked case.

Can't we just drop the conditional lock from mvs_task_exec() now
instead?  It will make the code much cleaner.

James


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