drm/i915/pmu: Fix wakeref leak in PMU busyness during reset

GuC PMU busyness gets gt wakeref if awake, but fails to release the
wakeref if a reset is in progress. Release the wakeref if it was
acquried successfully.

v2: Simplify the fix (Ashutosh)

Fixes: 2a67b18e67f3 ("drm/i915/pmu: Fix synchronization of PMU callback with reset")
Signed-off-by: Umesh Nerlige Ramappa <umesh.nerlige.ramappa@intel.com>
Reviewed-by: Ashutosh Dixit <ashutosh.dixit@intel.com>
Signed-off-by: John Harrison <John.C.Harrison@Intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20211207020239.43402-1-umesh.nerlige.ramappa@intel.com

diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
index 1f9d4fd..9731111 100644 (file)
--- a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
@@ -1206,7 +1206,7 @@ static ktime_t guc_engine_busyness(struct intel_engine_cs *engine, ktime_t *now)
         * start_gt_clk is derived from GuC state. To get a consistent
         * view of activity, we query the GuC state only if gt is awake.
         */
-       if (intel_gt_pm_get_if_awake(gt) && !in_reset) {
+       if (!in_reset && intel_gt_pm_get_if_awake(gt)) {
                stats_saved = *stats;
                gt_stamp_saved = guc->timestamp.gt_stamp;
                guc_update_engine_gt_clks(engine);