drm/amdgpu: don't grab dev->struct_mutex in pm functions

Similar to radeon, except that amdgpu doesn't even use struct_mutex to
protect anything like the shared z buffer (sane gpu architecture,
yay!). And the code already grabs the globa adev->ring_lock, so this
code can't race with itself. Which makes struct_mutex completely
redundnant. Remove it.

Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: "Christian König" <christian.koenig@amd.com>
Reviewed-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

1 files changed, 0 insertions, 2 deletions

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c
index 25b329f4b2d9..efed11509f4a 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c
@@ -580,7 +580,6 @@ force:
                 amdgpu_dpm_print_power_state(adev, adev->pm.dpm.requested_ps);
         }
 
-        mutex_lock(&adev->ddev->struct_mutex);
         mutex_lock(&adev->ring_lock);
 
         /* update whether vce is active */
@@ -628,7 +627,6 @@ force:
 
 done:
         mutex_unlock(&adev->ring_lock);
-        mutex_unlock(&adev->ddev->struct_mutex);
 }
 
 void amdgpu_dpm_enable_uvd(struct amdgpu_device *adev, bool enable)