linux-kernel - Re: [PATCH 2/3] drm/scheduler: Don't call wait_event

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Message-ID: <7313704c-0693-0bb9-8818-99cd2b7c0ca0@daenzer.net>
Date:   Tue, 24 Apr 2018 17:46:52 +0200
From:   Michel Dänzer <michel@...nzer.net>
To:     Andrey Grodzovsky <andrey.grodzovsky@....com>,
        linux-kernel@...r.kernel.org, amd-gfx@...ts.freedesktop.org,
        dri-devel@...ts.freedesktop.org
Cc:     David.Panariti@....com, oleg@...hat.com, ebiederm@...ssion.com,
        Alexander.Deucher@....com, akpm@...ux-foundation.org,
        Christian.Koenig@....com
Subject: Re: [PATCH 2/3] drm/scheduler: Don't call wait_event_killable for
 signaled process.


Adding the dri-devel list, since this is driver independent code.


On 2018-04-24 05:30 PM, Andrey Grodzovsky wrote:
> Avoid calling wait_event_killable when you are possibly being called
> from get_signal routine since in that case you end up in a deadlock
> where you are alreay blocked in singla processing any trying to wait

Multiple typos here, "[...] already blocked in signal processing and [...]"?


> on a new signal.
> 
> Signed-off-by: Andrey Grodzovsky <andrey.grodzovsky@....com>
> ---
>  drivers/gpu/drm/scheduler/gpu_scheduler.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/scheduler/gpu_scheduler.c b/drivers/gpu/drm/scheduler/gpu_scheduler.c
> index 088ff2b..09fd258 100644
> --- a/drivers/gpu/drm/scheduler/gpu_scheduler.c
> +++ b/drivers/gpu/drm/scheduler/gpu_scheduler.c
> @@ -227,9 +227,10 @@ void drm_sched_entity_do_release(struct drm_gpu_scheduler *sched,
>  		return;
>  	/**
>  	 * The client will not queue more IBs during this fini, consume existing
> -	 * queued IBs or discard them on SIGKILL
> +	 * queued IBs or discard them when in death signal state since
> +	 * wait_event_killable can't receive signals in that state.
>  	*/
> -	if ((current->flags & PF_SIGNALED) && current->exit_code == SIGKILL)
> +	if (current->flags & PF_SIGNALED)
>  		entity->fini_status = -ERESTARTSYS;
>  	else
>  		entity->fini_status = wait_event_killable(sched->job_scheduled,
> 


-- 
Earthling Michel Dänzer               |               http://www.amd.com
Libre software enthusiast             |             Mesa and X developer