drm/msm/devfreq: Fix OPP refcnt leak

[ Upstream commit 59ba1b2b4825342676300f66d785764be3fcb093 ]

Reported-by: Douglas Anderson <dianders@chromium.org>
Fixes: 9bc95570175a ("drm/msm: Devfreq tuning")
Signed-off-by: Rob Clark <robdclark@chromium.org>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Tested-By: Steev Klimaszewski <steev@kali.org>
Reviewed-by: Akhil P Oommen <akhilpo@codeaurora.org>
Link: https://lore.kernel.org/r/20211105202021.181092-1-robdclark@gmail.com
Signed-off-by: Rob Clark <robdclark@chromium.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/gpu/drm/msm/msm_gpu_devfreq.c b/drivers/gpu/drm/msm/msm_gpu_devfreq.c
index 20006d0..4ac2a4e 100644 (file)
--- 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;
        }