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drm/i915: Never return 0 if not all requests retired

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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: f33a8a5160 ("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.krzysztofik@linux.intel.com
This commit is contained in:
Janusz Krzysztofik 2022-11-21 15:56:55 +01:00 committed by Tvrtko Ursulin
parent f235dbd5b7
commit f301a29f14
1 changed files with 1 additions and 1 deletions
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2
drivers/gpu/drm/i915/gt/intel_gt_requests.c
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@ -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)