[Intel-gfx] [PATCH] drm/i915: don't leak global_timeline

[Chris Wilson]

On Thu, Nov 17, 2016 at 08:38:07PM +0000, Matthew Auld wrote:
> We need to clean up the global_timeline in i915_gem_load_cleanup.
> 
> v2: don't forget about the struct_mutex, and also WARN_ON if we have any
> remaining timelines before purging the global_timeline.
> 
> v3: it might be a good idea to first remove the global_timeline...duh!
> 
> Fixes: 73cb97010d4f ("drm/i915: Combine seqno + tracking into a global timeline struct")
> Cc: Chris Wilson <chris at chris-wilson.co.uk>
> Signed-off-by: Matthew Auld <matthew.auld at intel.com>
> ---
>  drivers/gpu/drm/i915/i915_gem.c | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
> index 3fb5e66e4d65..b7a8c8349ccb 100644
> --- a/drivers/gpu/drm/i915/i915_gem.c
> +++ b/drivers/gpu/drm/i915/i915_gem.c
> @@ -4557,6 +4557,12 @@ void i915_gem_load_cleanup(struct drm_device *dev)
>  
>  	WARN_ON(!llist_empty(&dev_priv->mm.free_list));
>  
> +	mutex_lock(&dev_priv->drm.struct_mutex);
> +	i915_gem_timeline_fini(&dev_priv->gt.global_timeline);
> +	mutex_unlock(&dev_priv->drm.struct_mutex);
> +
> +	WARN_ON(!list_empty(&dev_priv->gt.timelines));

I would have plonked this under the mutex, then it mirrors the 

mutex_lock()
INIT_LIST_HEAD()
i915_gem_timeline_init(&dev_priv->gt.global_timeline);
mutex_unlock()

we do at the start.

Reviewed-by: Chris Wilson <chris at chris-wilson.co.uk>

I'll surreptiously do that, and send this pair to CI together since the
order is important to avoid adding this WARN before the fix.
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre