[Intel-gfx] [PATCH] drm/i915/pmu: Fix wakeref leak in PMU busyness during reset

[Dixit, Ashutosh]

On Mon, 06 Dec 2021 18:02:39 -0800, Umesh Nerlige Ramappa wrote:
>
> 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)

Reviewed-by: Ashutosh Dixit <ashutosh.dixit at intel.com>

> Signed-off-by: Umesh Nerlige Ramappa <umesh.nerlige.ramappa at intel.com>
> ---
>  drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> 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 1f9d4fde421f..97311119da6f 100644
> --- 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);
> --
> 2.20.1
>