[PATCH] drm/syncobj: Don't leak fences when WAIT_FOR_SUBMIT is set

[Sean Paul]

On Wed, Sep 26, 2018 at 02:17:03AM -0500, Jason Ekstrand wrote:
> We attempt to get fences earlier in the hopes that everything will
> already have fences and no callbacks will be needed.  If we do succeed
> in getting a fence, getting one a second time will result in a duplicate
> ref with no unref.  This is causing memory leaks in Vulkan applications
> that create a lot of fences; playing for a few hours can, apparently,
> bring down the system.
> 
> Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=107899
> Signed-off-by: Jason Ekstrand <jason at jlekstrand.net>

Pushed to drm-misc-fixes, thanks!

Sean

> Cc: stable at vger.kernel.org
> ---
>  drivers/gpu/drm/drm_syncobj.c | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/drivers/gpu/drm/drm_syncobj.c b/drivers/gpu/drm/drm_syncobj.c
> index adb3cb27d31e..759278fef35a 100644
> --- a/drivers/gpu/drm/drm_syncobj.c
> +++ b/drivers/gpu/drm/drm_syncobj.c
> @@ -97,6 +97,8 @@ static int drm_syncobj_fence_get_or_add_callback(struct drm_syncobj *syncobj,
>  {
>  	int ret;
>  
> +	WARN_ON(*fence);
> +
>  	*fence = drm_syncobj_fence_get(syncobj);
>  	if (*fence)
>  		return 1;
> @@ -743,6 +745,9 @@ static signed long drm_syncobj_array_wait_timeout(struct drm_syncobj **syncobjs,
>  
>  	if (flags & DRM_SYNCOBJ_WAIT_FLAGS_WAIT_FOR_SUBMIT) {
>  		for (i = 0; i < count; ++i) {
> +			if (entries[i].fence)
> +				continue;
> +
>  			drm_syncobj_fence_get_or_add_callback(syncobjs[i],
>  							      &entries[i].fence,
>  							      &entries[i].syncobj_cb,
> -- 
> 2.17.1
> 
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-- 
Sean Paul, Software Engineer, Google / Chromium OS