radeon/pm: Guard access to rdev->pm.power_state array

It's never allocated on systems without an ATOMBIOS or COMBIOS ROM.

Should fix an oops I encountered while resetting the GPU after a lockup
on my PowerBook with an RV350.

Signed-off-by: Michel Dänzer <michel.daenzer@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org

1 files changed, 4 insertions, 2 deletions

diff --git a/drivers/gpu/drm/radeon/radeon_pm.c b/drivers/gpu/drm/radeon/radeon_pm.c
index c0ff2002dc8e..0b24c4c7dcf9 100644
--- a/drivers/gpu/drm/radeon/radeon_pm.c
+++ b/drivers/gpu/drm/radeon/radeon_pm.c
@@ -1010,8 +1010,10 @@ static void radeon_pm_resume_old(struct radeon_device *rdev)
         rdev->pm.current_clock_mode_index = 0;
         rdev->pm.current_sclk = rdev->pm.default_sclk;
         rdev->pm.current_mclk = rdev->pm.default_mclk;
-        rdev->pm.current_vddc = rdev->pm.power_state[rdev->pm.default_power_state_index].clock_info[0].voltage.voltage;
-        rdev->pm.current_vddci = rdev->pm.power_state[rdev->pm.default_power_state_index].clock_info[0].voltage.vddci;
+        if (rdev->pm.power_state) {
+                rdev->pm.current_vddc = rdev->pm.power_state[rdev->pm.default_power_state_index].clock_info[0].voltage.voltage;
+                rdev->pm.current_vddci = rdev->pm.power_state[rdev->pm.default_power_state_index].clock_info[0].voltage.vddci;
+        }
         if (rdev->pm.pm_method == PM_METHOD_DYNPM
             && rdev->pm.dynpm_state == DYNPM_STATE_SUSPENDED) {
                 rdev->pm.dynpm_state = DYNPM_STATE_ACTIVE;