From f301a29f143760ce8d3d6b6a8436d45d3448cde6 Mon Sep 17 00:00:00 2001 From: Janusz Krzysztofik Date: Mon, 21 Nov 2022 15:56:55 +0100 Subject: [PATCH] drm/i915: Never return 0 if not all requests retired Users of intel_gt_retire_requests_timeout() expect 0 return value on success. However, we have no protection from passing back 0 potentially returned by a call to dma_fence_wait_timeout() when it succedes right after its timeout has expired. Replace 0 with -ETIME before potentially using the timeout value as return code, so -ETIME is returned if there are still some requests not retired after timeout, 0 otherwise. v3: Use conditional expression, more compact but also better reflecting intention standing behind the change. v2: Move the added lines down so flush_submission() is not affected. Fixes: f33a8a51602c ("drm/i915: Merge wait_for_timelines with retire_request") Signed-off-by: Janusz Krzysztofik Reviewed-by: Andrzej Hajda Cc: stable@vger.kernel.org # v5.5+ Signed-off-by: Tvrtko Ursulin Link: https://patchwork.freedesktop.org/patch/msgid/20221121145655.75141-3-janusz.krzysztofik@linux.intel.com --- drivers/gpu/drm/i915/gt/intel_gt_requests.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/gpu/drm/i915/gt/intel_gt_requests.c b/drivers/gpu/drm/i915/gt/intel_gt_requests.c index edb881d..1dfd016 100644 --- a/drivers/gpu/drm/i915/gt/intel_gt_requests.c +++ b/drivers/gpu/drm/i915/gt/intel_gt_requests.c @@ -199,7 +199,7 @@ out_active: spin_lock(&timelines->lock); if (remaining_timeout) *remaining_timeout = timeout; - return active_count ? timeout : 0; + return active_count ? timeout ?: -ETIME : 0; } static void retire_work_handler(struct work_struct *work) -- 2.7.4