From: Qinglang Miao <miaoqinglang@huawei.com> To: Eric Anholt <eric@anholt.net>, David Airlie <airlied@linux.ie>, "Daniel Vetter" <daniel@ffwll.ch> Cc: <dri-devel@lists.freedesktop.org>, <linux-kernel@vger.kernel.org>, Qinglang Miao <miaoqinglang@huawei.com> Subject: [PATCH] drm/v3d: fix reference leak when pm_runtime_get_sync fails Date: Tue, 1 Dec 2020 20:56:32 +0800 [thread overview] Message-ID: <20201201125632.142636-1-miaoqinglang@huawei.com> (raw) The PM reference count is not expected to be incremented on return in functions v3d_get_param_ioctl and v3d_job_init. However, pm_runtime_get_sync will increment the PM reference count even failed. Forgetting to putting operation will result in a reference leak here. Replace it with pm_runtime_resume_and_get to keep usage counter balanced. Fixes: 57692c94dcbe ("drm/v3d: Introduce a new DRM driver for Broadcom V3D V3.x+") Fixes: 935f3d88434b ("drm/v3d: Make sure the GPU is on when measuring clocks.") Reported-by: Hulk Robot <hulkci@huawei.com> Signed-off-by: Qinglang Miao <miaoqinglang@huawei.com> --- drivers/gpu/drm/v3d/v3d_debugfs.c | 4 ++-- drivers/gpu/drm/v3d/v3d_gem.c | 2 +- 2 files changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/gpu/drm/v3d/v3d_debugfs.c b/drivers/gpu/drm/v3d/v3d_debugfs.c index e76b24bb8..91ceed774 100644 --- a/drivers/gpu/drm/v3d/v3d_debugfs.c +++ b/drivers/gpu/drm/v3d/v3d_debugfs.c @@ -132,7 +132,7 @@ static int v3d_v3d_debugfs_ident(struct seq_file *m, void *unused) u32 ident0, ident1, ident2, ident3, cores; int ret, core; - ret = pm_runtime_get_sync(v3d->drm.dev); + ret = pm_runtime_resume_and_get(v3d->drm.dev); if (ret < 0) return ret; @@ -219,7 +219,7 @@ static int v3d_measure_clock(struct seq_file *m, void *unused) int measure_ms = 1000; int ret; - ret = pm_runtime_get_sync(v3d->drm.dev); + ret = pm_runtime_resume_and_get(v3d->drm.dev); if (ret < 0) return ret; diff --git a/drivers/gpu/drm/v3d/v3d_gem.c b/drivers/gpu/drm/v3d/v3d_gem.c index 182c58652..765683569 100644 --- a/drivers/gpu/drm/v3d/v3d_gem.c +++ b/drivers/gpu/drm/v3d/v3d_gem.c @@ -439,7 +439,7 @@ v3d_job_init(struct v3d_dev *v3d, struct drm_file *file_priv, job->v3d = v3d; job->free = free; - ret = pm_runtime_get_sync(v3d->drm.dev); + ret = pm_runtime_resume_and_get(v3d->drm.dev); if (ret < 0) return ret; -- 2.23.0
WARNING: multiple messages have this Message-ID (diff)
From: Qinglang Miao <miaoqinglang@huawei.com> To: Eric Anholt <eric@anholt.net>, David Airlie <airlied@linux.ie>, "Daniel Vetter" <daniel@ffwll.ch> Cc: Qinglang Miao <miaoqinglang@huawei.com>, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org Subject: [PATCH] drm/v3d: fix reference leak when pm_runtime_get_sync fails Date: Tue, 1 Dec 2020 20:56:32 +0800 [thread overview] Message-ID: <20201201125632.142636-1-miaoqinglang@huawei.com> (raw) The PM reference count is not expected to be incremented on return in functions v3d_get_param_ioctl and v3d_job_init. However, pm_runtime_get_sync will increment the PM reference count even failed. Forgetting to putting operation will result in a reference leak here. Replace it with pm_runtime_resume_and_get to keep usage counter balanced. Fixes: 57692c94dcbe ("drm/v3d: Introduce a new DRM driver for Broadcom V3D V3.x+") Fixes: 935f3d88434b ("drm/v3d: Make sure the GPU is on when measuring clocks.") Reported-by: Hulk Robot <hulkci@huawei.com> Signed-off-by: Qinglang Miao <miaoqinglang@huawei.com> --- drivers/gpu/drm/v3d/v3d_debugfs.c | 4 ++-- drivers/gpu/drm/v3d/v3d_gem.c | 2 +- 2 files changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/gpu/drm/v3d/v3d_debugfs.c b/drivers/gpu/drm/v3d/v3d_debugfs.c index e76b24bb8..91ceed774 100644 --- a/drivers/gpu/drm/v3d/v3d_debugfs.c +++ b/drivers/gpu/drm/v3d/v3d_debugfs.c @@ -132,7 +132,7 @@ static int v3d_v3d_debugfs_ident(struct seq_file *m, void *unused) u32 ident0, ident1, ident2, ident3, cores; int ret, core; - ret = pm_runtime_get_sync(v3d->drm.dev); + ret = pm_runtime_resume_and_get(v3d->drm.dev); if (ret < 0) return ret; @@ -219,7 +219,7 @@ static int v3d_measure_clock(struct seq_file *m, void *unused) int measure_ms = 1000; int ret; - ret = pm_runtime_get_sync(v3d->drm.dev); + ret = pm_runtime_resume_and_get(v3d->drm.dev); if (ret < 0) return ret; diff --git a/drivers/gpu/drm/v3d/v3d_gem.c b/drivers/gpu/drm/v3d/v3d_gem.c index 182c58652..765683569 100644 --- a/drivers/gpu/drm/v3d/v3d_gem.c +++ b/drivers/gpu/drm/v3d/v3d_gem.c @@ -439,7 +439,7 @@ v3d_job_init(struct v3d_dev *v3d, struct drm_file *file_priv, job->v3d = v3d; job->free = free; - ret = pm_runtime_get_sync(v3d->drm.dev); + ret = pm_runtime_resume_and_get(v3d->drm.dev); if (ret < 0) return ret; -- 2.23.0 _______________________________________________ dri-devel mailing list dri-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/dri-devel
next reply other threads:[~2020-12-01 12:49 UTC|newest] Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top 2020-12-01 12:56 Qinglang Miao [this message] 2020-12-01 12:56 ` [PATCH] drm/v3d: fix reference leak when pm_runtime_get_sync fails Qinglang Miao
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