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

[Michel Dänzer]

From: Michel D?nzer <michel.daen...@amd.com>

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 D?nzer <michel.daenzer at amd.com>
---
 drivers/gpu/drm/radeon/radeon_pm.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/radeon/radeon_pm.c 
b/drivers/gpu/drm/radeon/radeon_pm.c
index 4f6b7fc..a0ec4bb 100644
--- a/drivers/gpu/drm/radeon/radeon_pm.c
+++ b/drivers/gpu/drm/radeon/radeon_pm.c
@@ -1024,8 +1024,10 @@ 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;
-- 
1.8.5.2