drm/radeon: Don't take dev->struct_mutex in pm functions

We already grab 2 device-global locks (write-sema rdev->pm.mclk_lock
and rdev->ring_lock), adding another global mutex won't serialize this
code more. And since there's really nothing interesting that gets
protected in radeon by dev->struct mutex (we only have the global z
buffer owners and it's still serializing gem bo destruction in the drm
core - which is irrelevant since radeon uses ttm anyway internally)
this doesn't add protection. 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>

diff --git a/drivers/gpu/drm/radeon/radeon_pm.c b/drivers/gpu/drm/radeon/radeon_pm.c
index c1ba83a..05751f3 100644 (file)
--- a/drivers/gpu/drm/radeon/radeon_pm.c
+++ b/drivers/gpu/drm/radeon/radeon_pm.c
@@ -253,7 +253,6 @@ static void radeon_pm_set_clocks(struct radeon_device *rdev)
            (rdev->pm.requested_power_state_index == rdev->pm.current_power_state_index))
                return;
 
-       mutex_lock(&rdev->ddev->struct_mutex);
        down_write(&rdev->pm.mclk_lock);
        mutex_lock(&rdev->ring_lock);
 
@@ -268,7 +267,6 @@ static void radeon_pm_set_clocks(struct radeon_device *rdev)
                        /* needs a GPU reset dont reset here */
                        mutex_unlock(&rdev->ring_lock);
                        up_write(&rdev->pm.mclk_lock);
-                       mutex_unlock(&rdev->ddev->struct_mutex);
                        return;
                }
        }
@@ -304,7 +302,6 @@ static void radeon_pm_set_clocks(struct radeon_device *rdev)
 
        mutex_unlock(&rdev->ring_lock);
        up_write(&rdev->pm.mclk_lock);
-       mutex_unlock(&rdev->ddev->struct_mutex);
 }
 
 static void radeon_pm_print_states(struct radeon_device *rdev)
@@ -1062,7 +1059,6 @@ force:
                radeon_dpm_print_power_state(rdev, rdev->pm.dpm.requested_ps);
        }
 
-       mutex_lock(&rdev->ddev->struct_mutex);
        down_write(&rdev->pm.mclk_lock);
        mutex_lock(&rdev->ring_lock);
 
@@ -1113,7 +1109,6 @@ force:
 done:
        mutex_unlock(&rdev->ring_lock);
        up_write(&rdev->pm.mclk_lock);
-       mutex_unlock(&rdev->ddev->struct_mutex);
 }
 
 void radeon_dpm_enable_uvd(struct radeon_device *rdev, bool enable)