The patch below does not apply to the 6.0-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.

Possible dependencies:

35aba5f51a39 ("drm/i915: Never return 0 if not all requests retired")

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 35aba5f51a39fb95351844ffb14ec02b8970e19f Mon Sep 17 00:00:00 2001 From: Janusz Krzysztofik janusz.krzysztofik@linux.intel.com 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 janusz.krzysztofik@linux.intel.com Reviewed-by: Andrzej Hajda andrzej.hajda@intel.com Cc: stable@vger.kernel.org # v5.5+ Signed-off-by: Tvrtko Ursulin tvrtko.ursulin@intel.com Link: https://patchwork.freedesktop.org/patch/msgid/20221121145655.75141-3-janusz.... (cherry picked from commit f301a29f143760ce8d3d6b6a8436d45d3448cde6) Signed-off-by: Rodrigo Vivi rodrigo.vivi@intel.com

diff --git a/drivers/gpu/drm/i915/gt/intel_gt_requests.c b/drivers/gpu/drm/i915/gt/intel_gt_requests.c index edb881d75630..1dfd01668c79 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)