[PATCH 5.15 154/207] drm/msm/devfreq: Fix OPP refcnt leak

[Greg Kroah-Hartman]

From: Rob Clark <robdclark@xxxxxxxxxxxx>

[ Upstream commit 59ba1b2b4825342676300f66d785764be3fcb093 ]

Reported-by: Douglas Anderson <dianders@xxxxxxxxxxxx>
Fixes: 9bc95570175a ("drm/msm: Devfreq tuning")
Signed-off-by: Rob Clark <robdclark@xxxxxxxxxxxx>
Reviewed-by: Douglas Anderson <dianders@xxxxxxxxxxxx>
Tested-By: Steev Klimaszewski <steev@xxxxxxxx>
Reviewed-by: Akhil P Oommen <akhilpo@xxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20211105202021.181092-1-robdclark@xxxxxxxxx
Signed-off-by: Rob Clark <robdclark@xxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 drivers/gpu/drm/msm/msm_gpu_devfreq.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/gpu/drm/msm/msm_gpu_devfreq.c b/drivers/gpu/drm/msm/msm_gpu_devfreq.c
index 20006d060b5b5..4ac2a4eb984d8 100644
--- a/drivers/gpu/drm/msm/msm_gpu_devfreq.c
+++ b/drivers/gpu/drm/msm/msm_gpu_devfreq.c
@@ -20,6 +20,10 @@ static int msm_devfreq_target(struct device *dev, unsigned long *freq,
 	struct msm_gpu *gpu = dev_to_gpu(dev);
 	struct dev_pm_opp *opp;
 
+	/*
+	 * Note that devfreq_recommended_opp() can modify the freq
+	 * to something that actually is in the opp table:
+	 */
 	opp = devfreq_recommended_opp(dev, freq, flags);
 
 	/*
@@ -28,6 +32,7 @@ static int msm_devfreq_target(struct device *dev, unsigned long *freq,
 	 */
 	if (gpu->devfreq.idle_freq) {
 		gpu->devfreq.idle_freq = *freq;
+		dev_pm_opp_put(opp);
 		return 0;
 	}
 
-- 
2.33.0