From: Daniel Vetter Date: Thu, 9 Jul 2015 21:32:48 +0000 (+0200) Subject: drm/radeon: Don't take dev->struct_mutex in pm functions X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=34ddc3e9d1781a4914c673013c0eaca3ae642641;p=GitHub%2Fexynos8895%2Fandroid_kernel_samsung_universal8895.git 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 Cc: "Christian König" Reviewed-by: Thierry Reding Signed-off-by: Daniel Vetter Signed-off-by: Alex Deucher --- diff --git a/drivers/gpu/drm/radeon/radeon_pm.c b/drivers/gpu/drm/radeon/radeon_pm.c index c1ba83a8dd8c..05751f3f8444 100644 --- 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)