[PATCH] drm/i915: Check return intel_context_timeline_lock of in eb_pin_timeline

[John Harrison]

On 1/4/2022 09:31, Matthew Brost wrote:
> intel_context_timeline_lock can return can error if interrupted by a
> user when trying to lock the timeline mutex. Check the return value of
> intel_context_timeline_lock in eb_pin_timeline (execbuf IOCTL).
>
> Fixes: 544460c33821 ("drm/i915: Multi-BB execbuf")
> Signed-off-by: Matthew Brost <matthew.brost at intel.com>
> ---
>   drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c | 3 +++
>   1 file changed, 3 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
> index e9541244027a..65a078945b00 100644
> --- a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
> +++ b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
> @@ -2517,6 +2517,9 @@ static int eb_pin_timeline(struct i915_execbuffer *eb, struct intel_context *ce,
>   			i915_request_put(rq);
>   
>   			tl = intel_context_timeline_lock(ce);
> +			if (IS_ERR(tl))
> +				return PTR_ERR(tl);
> +
>   			intel_context_exit(ce);
Won't this leak the stuff acquired by the intel_context_enter() above if 
the _exit() is now skipped?

John.

>   			intel_context_timeline_unlock(tl);
>