drm/radeon/kms/atom: fix possible segfault in pm setup

4376eee9 · Alexander Müller <[email protected]> · 2011-12-30 12:55:48 -05:00

If we end up with no power states, don't look up
current vddc.

fixes:
https://bugs.freedesktop.org/show_bug.cgi?id=44130

agd5f: fix patch formatting

Signed-off-by: Alex Deucher <[email protected]>
Cc: [email protected]
Signed-off-by: Dave Airlie <[email protected]>

Commit: 4376eee92e5a8332b470040e672ea99cd44c826a
Parents: 115e8e70

Changes

1 files changed · +5 −1

File	Status	Add	Del	Content
drivers/gpu/drm/radeon/radeon_atombios.c	modified	+5	−1	View file

drivers/gpu/drm/radeon/radeon_atombios.c

View file

diff --git a/drivers/gpu/drm/radeon/radeon_atombios.c b/drivers/gpu/drm/radeon/radeon_atombios.c
index d24baf3..5082d17 100644
--- a/drivers/gpu/drm/radeon/radeon_atombios.c
+++ b/drivers/gpu/drm/radeon/radeon_atombios.c
@@ -2560,7 +2560,11 @@ void radeon_atombios_get_power_modes(struct radeon_device *rdev)
 
 	rdev->pm.current_power_state_index = rdev->pm.default_power_state_index;
 	rdev->pm.current_clock_mode_index = 0;
-	rdev->pm.current_vddc = rdev->pm.power_state[rdev->pm.default_power_state_index].clock_info[0].voltage.voltage;
+	if (rdev->pm.default_power_state_index >= 0)
+		rdev->pm.current_vddc =
+			rdev->pm.power_state[rdev->pm.default_power_state_index].clock_info[0].voltage.voltage;
+	else
+		rdev->pm.current_vddc = 0;
 }
 
 void radeon_atom_set_clock_gating(struct radeon_device *rdev, int enable)