linux-kernel - Re: [PATCH 1/3] drm/vc4: Fix double destroy of the BO cache on teardown.

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Date:   Fri, 4 Aug 2017 12:01:45 +0200
From:   Boris Brezillon <boris.brezillon@...e-electrons.com>
To:     Eric Anholt <eric@...olt.net>
Cc:     dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] drm/vc4: Fix double destroy of the BO cache on
 teardown.

On Wed,  2 Aug 2017 13:32:40 -0700
Eric Anholt <eric@...olt.net> wrote:

> It's also destroyed from the top level vc4_drv.c initialization, which
> is where the cache was actually initialized from.
> 
> This used to just involve duplicate del_timer() and cancel_work_sync()
> being called, but it started causing kmalloc issues once we
> double-freed the new BO label array.
> 
> Fixes: 1908a876f909 ("drm/vc4: Add an ioctl for labeling GEM BOs for summary stats")
> Signed-off-by: Eric Anholt <eric@...olt.net>

Reviewed-by: Boris Brezillon <boris.brezillon@...e-electrons.com>

> ---
>  drivers/gpu/drm/vc4/vc4_gem.c | 2 --
>  1 file changed, 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/vc4/vc4_gem.c b/drivers/gpu/drm/vc4/vc4_gem.c
> index 209fccd0d3b4..892a031a3ced 100644
> --- a/drivers/gpu/drm/vc4/vc4_gem.c
> +++ b/drivers/gpu/drm/vc4/vc4_gem.c
> @@ -1117,6 +1117,4 @@ vc4_gem_destroy(struct drm_device *dev)
>  
>  	if (vc4->hang_state)
>  		vc4_free_hang_state(dev, vc4->hang_state);
> -
> -	vc4_bo_cache_destroy(dev);
>  }