From 370169516e736edad3b3c5aa49858058f8b55195 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Michel=20D=C3=A4nzer?= <michel.daenzer@amd.com>
Date: Wed, 8 Jan 2014 11:40:20 +0900
Subject: [PATCH] radeon/pm: Guard access to rdev->pm.power_state array
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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
---
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 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;
--
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