linux-kernel - Re: [PATCH] drm/amdgpu: remove useless condition in amdgpu_job_stop_all_jobs_on

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Date:   Mon, 25 Jul 2022 12:40:28 -0400
From:   Andrey Grodzovsky <andrey.grodzovsky@....com>
To:     Andrey Strachuk <strochuk@...ras.ru>,
        Alex Deucher <alexander.deucher@....com>
Cc:     Christian König <christian.koenig@....com>,
        "Pan, Xinhui" <Xinhui.Pan@....com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>, Emma Anholt <emma@...olt.net>,
        Melissa Wen <mwen@...lia.com>,
        Guchun Chen <guchun.chen@....com>,
        Surbhi Kakarya <surbhi.kakarya@....com>,
        Jack Zhang <Jack.Zhang1@....com>,
        Hawking Zhang <Hawking.Zhang@....com>,
        Felix Kuehling <Felix.Kuehling@....com>,
        amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, ldv-project@...uxtesting.org
Subject: Re: [PATCH] drm/amdgpu: remove useless condition in
 amdgpu_job_stop_all_jobs_on_sched()

Reviewed-by: Andrey Grodzovsky <andrey.grodzovsky@....com>

Andrey

On 2022-07-19 06:39, Andrey Strachuk wrote:
> Local variable 'rq' is initialized by an address
> of field of drm_sched_job, so it does not make
> sense to compare 'rq' with NULL.
>
> Found by Linux Verification Center (linuxtesting.org) with SVACE.
>
> Signed-off-by: Andrey Strachuk <strochuk@...ras.ru>
> Fixes: 7c6e68c777f1 ("drm/amdgpu: Avoid HW GPU reset for RAS.")
> ---
>   drivers/gpu/drm/amd/amdgpu/amdgpu_job.c | 4 ----
>   1 file changed, 4 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_job.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_job.c
> index 67f66f2f1809..600401f2a98f 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_job.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_job.c
> @@ -285,10 +285,6 @@ void amdgpu_job_stop_all_jobs_on_sched(struct drm_gpu_scheduler *sched)
>   	/* Signal all jobs not yet scheduled */
>   	for (i = DRM_SCHED_PRIORITY_COUNT - 1; i >= DRM_SCHED_PRIORITY_MIN; i--) {
>   		struct drm_sched_rq *rq = &sched->sched_rq[i];
> -
> -		if (!rq)
> -			continue;
> -
>   		spin_lock(&rq->lock);
>   		list_for_each_entry(s_entity, &rq->entities, list) {
>   			while ((s_job = to_drm_sched_job(spsc_queue_pop(&s_entity->job_queue)))) {