[PATCH] drm/xe/guc_submit: add back fix

[Matthew Brost]

On Tue, Jun 03, 2025 at 06:42:14PM +0100, Matthew Auld wrote:
> Daniele noticed that the fix in commit 2d2be279f1ca ("drm/xe: fix UAF
> around queue destruction") looks to have been unintentionally removed as
> part of handling a conflict in some past merge commit. Add it back.
> 
> Fixes: ac44ff7cec33 ("Merge tag 'drm-xe-fixes-2024-10-10' of https://gitlab.freedesktop.org/drm/xe/kernel into drm-fixes")
> Reported-by: Daniele Ceraolo Spurio <daniele.ceraolospurio at intel.com>
> Signed-off-by: Matthew Auld <matthew.auld at intel.com>
> Cc: Matthew Brost <matthew.brost at intel.com>

Reviewed-by: Matthew Brost <matthew.brost at intel.com>

> Cc: <stable at vger.kernel.org> # v6.12+
> ---
>  drivers/gpu/drm/xe/xe_guc_submit.c | 11 +++++++++++
>  1 file changed, 11 insertions(+)
> 
> diff --git a/drivers/gpu/drm/xe/xe_guc_submit.c b/drivers/gpu/drm/xe/xe_guc_submit.c
> index 80f748baad3f..2b61d017eeca 100644
> --- a/drivers/gpu/drm/xe/xe_guc_submit.c
> +++ b/drivers/gpu/drm/xe/xe_guc_submit.c
> @@ -229,6 +229,17 @@ static bool exec_queue_killed_or_banned_or_wedged(struct xe_exec_queue *q)
>  static void guc_submit_fini(struct drm_device *drm, void *arg)
>  {
>  	struct xe_guc *guc = arg;
> +	struct xe_device *xe = guc_to_xe(guc);
> +	struct xe_gt *gt = guc_to_gt(guc);
> +	int ret;
> +
> +	ret = wait_event_timeout(guc->submission_state.fini_wq,
> +				 xa_empty(&guc->submission_state.exec_queue_lookup),
> +				 HZ * 5);
> +
> +	drain_workqueue(xe->destroy_wq);
> +
> +	xe_gt_assert(gt, ret);
>  
>  	xa_destroy(&guc->submission_state.exec_queue_lookup);
>  }
> -- 
> 2.49.0
>