| Message ID | 20220708162632.3529864-1-bjorn.andersson@linaro.org (mailing list archive) |
|---|---|
| State | Not Applicable |
| Headers | show |
| Series | drm/msm/gpu: Drop qos request if devm_devfreq_add_device() fails | expand |
On Fri, Jul 8, 2022 at 9:24 AM Bjorn Andersson <bjorn.andersson@linaro.org> wrote: > > In the event that devm_devfreq_add_device() fails the device's qos freq > list is left referencing df->idle_freq and df->boost_freq. Attempting to > initialize devfreq again after a probe deferral will then cause invalid > memory accesses in dev_pm_qos_add_request(). > > Fix this by dropping the requests in the error path. > > Fixes: 7c0ffcd40b16 ("drm/msm/gpu: Respect PM QoS constraints") > Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org> Reviewed-by: Rob Clark <robdclark@gmail.com> > --- > drivers/gpu/drm/msm/msm_gpu_devfreq.c | 2 ++ > 1 file changed, 2 insertions(+) > > diff --git a/drivers/gpu/drm/msm/msm_gpu_devfreq.c b/drivers/gpu/drm/msm/msm_gpu_devfreq.c > index c2ea978c8921..21e271a318ee 100644 > --- a/drivers/gpu/drm/msm/msm_gpu_devfreq.c > +++ b/drivers/gpu/drm/msm/msm_gpu_devfreq.c > @@ -198,6 +198,8 @@ void msm_devfreq_init(struct msm_gpu *gpu) > > if (IS_ERR(df->devfreq)) { > DRM_DEV_ERROR(&gpu->pdev->dev, "Couldn't initialize GPU devfreq\n"); > + dev_pm_qos_remove_request(&df->idle_freq); > + dev_pm_qos_remove_request(&df->boost_freq); > df->devfreq = NULL; > return; > } > -- > 2.35.1 >
On 08/07/2022 19:26, Bjorn Andersson wrote: > In the event that devm_devfreq_add_device() fails the device's qos freq > list is left referencing df->idle_freq and df->boost_freq. Attempting to > initialize devfreq again after a probe deferral will then cause invalid > memory accesses in dev_pm_qos_add_request(). > > Fix this by dropping the requests in the error path. > > Fixes: 7c0ffcd40b16 ("drm/msm/gpu: Respect PM QoS constraints") > Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org> > --- > drivers/gpu/drm/msm/msm_gpu_devfreq.c | 2 ++ > 1 file changed, 2 insertions(+)
diff --git a/drivers/gpu/drm/msm/msm_gpu_devfreq.c b/drivers/gpu/drm/msm/msm_gpu_devfreq.c index c2ea978c8921..21e271a318ee 100644 --- a/drivers/gpu/drm/msm/msm_gpu_devfreq.c +++ b/drivers/gpu/drm/msm/msm_gpu_devfreq.c @@ -198,6 +198,8 @@ void msm_devfreq_init(struct msm_gpu *gpu) if (IS_ERR(df->devfreq)) { DRM_DEV_ERROR(&gpu->pdev->dev, "Couldn't initialize GPU devfreq\n"); + dev_pm_qos_remove_request(&df->idle_freq); + dev_pm_qos_remove_request(&df->boost_freq); df->devfreq = NULL; return; }
In the event that devm_devfreq_add_device() fails the device's qos freq list is left referencing df->idle_freq and df->boost_freq. Attempting to initialize devfreq again after a probe deferral will then cause invalid memory accesses in dev_pm_qos_add_request(). Fix this by dropping the requests in the error path. Fixes: 7c0ffcd40b16 ("drm/msm/gpu: Respect PM QoS constraints") Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org> --- drivers/gpu/drm/msm/msm_gpu_devfreq.c | 2 ++ 1 file changed, 2 insertions(+)