[PATCH 3/4] drm/amdgpu/fence: fix ref count leak when pm_runtime_get_sync fails

[Bhardwaj, Rajneesh]

[AMD Official Use Only - Internal Distribution Only]

Reviewed-by: Rajneesh Bhardwaj <rajneesh.bhardwaj at amd.com>

-----Original Message-----
From: amd-gfx <amd-gfx-bounces at lists.freedesktop.org> On Behalf Of Alex Deucher
Sent: Wednesday, June 17, 2020 3:02 PM
To: amd-gfx at lists.freedesktop.org
Cc: Deucher, Alexander <Alexander.Deucher at amd.com>
Subject: [PATCH 3/4] drm/amdgpu/fence: fix ref count leak when pm_runtime_get_sync fails

[CAUTION: External Email]

The call to pm_runtime_get_sync increments the counter even in case of failure, leading to incorrect ref count.
In case of failure, decrement the ref count before returning.

Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c
index 8537f4704348..60b323d7caf2 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c
@@ -755,8 +755,10 @@ static int amdgpu_debugfs_gpu_recover(struct seq_file *m, void *data)
        int r;

        r = pm_runtime_get_sync(dev->dev);
-       if (r < 0)
+       if (r < 0) {
+               pm_runtime_put_autosuspend(dev->dev);
                return 0;
+       }

        seq_printf(m, "gpu recover\n");
        amdgpu_device_gpu_recover(adev, NULL);
--
2.25.4

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