linux-kernel - Re: [PATCH 01/19] drm/msm: remove dangling submitqueue references

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Date:   Tue, 1 Sep 2020 05:42:42 +0000
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Rob Clark <robdclark@...il.com>
Cc:     dri-devel@...ts.freedesktop.org, iommu@...ts.linux-foundation.org,
        linux-arm-msm@...r.kernel.org,
        Sai Prakash Ranjan <saiprakash.ranjan@...eaurora.org>,
        Will Deacon <will@...nel.org>, freedreno@...ts.freedesktop.org,
        Sibi Sankar <sibis@...eaurora.org>,
        Vivek Gautam <vivek.gautam@...eaurora.org>,
        Stephen Boyd <swboyd@...omium.org>,
        Robin Murphy <robin.murphy@....com>,
        Joerg Roedel <joro@...tes.org>,
        linux-arm-kernel@...ts.infradead.org,
        Rob Clark <robdclark@...omium.org>,
        Sean Paul <sean@...rly.run>, David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 01/19] drm/msm: remove dangling submitqueue references

On Fri 14 Aug 02:40 UTC 2020, Rob Clark wrote:

> From: Rob Clark <robdclark@...omium.org>
> 
> Currently it doesn't matter, since we free the ctx immediately.  But
> when we start refcnt'ing the ctx, we don't want old dangling list
> entries to hang around.
> 
> Signed-off-by: Rob Clark <robdclark@...omium.org>

Reviewed-by: Bjorn Andersson <bjorn.andersson@...aro.org>

> ---
>  drivers/gpu/drm/msm/msm_submitqueue.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/msm/msm_submitqueue.c b/drivers/gpu/drm/msm/msm_submitqueue.c
> index a1d94be7883a..90c9d84e6155 100644
> --- a/drivers/gpu/drm/msm/msm_submitqueue.c
> +++ b/drivers/gpu/drm/msm/msm_submitqueue.c
> @@ -49,8 +49,10 @@ void msm_submitqueue_close(struct msm_file_private *ctx)
>  	 * No lock needed in close and there won't
>  	 * be any more user ioctls coming our way
>  	 */
> -	list_for_each_entry_safe(entry, tmp, &ctx->submitqueues, node)
> +	list_for_each_entry_safe(entry, tmp, &ctx->submitqueues, node) {
> +		list_del(&entry->node);
>  		msm_submitqueue_put(entry);
> +	}
>  }
>  
>  int msm_submitqueue_create(struct drm_device *drm, struct msm_file_private *ctx,
> -- 
> 2.26.2
>