From: Alex Deucher <alexdeucher@gmail.com>
Date: Sun, 14 Mar 2010 20:31:36 +0000 (-0400)
Subject: drm/radeon/kms/pm: fix segfault in clock code
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=57f50d70e27f99a9a785c760b2123cdf6a68e2de;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git

drm/radeon/kms/pm: fix segfault in clock code

Make sure we have a crtc assigned to the encoder
before dereferencing it.

Signed-off-by: Alex Deucher <alexdeucher@gmail.com>
---

diff --git a/drivers/gpu/drm/radeon/radeon_pm.c b/drivers/gpu/drm/radeon/radeon_pm.c
index 6458d52be4ee..a4b57493aa78 100644
--- a/drivers/gpu/drm/radeon/radeon_pm.c
+++ b/drivers/gpu/drm/radeon/radeon_pm.c
@@ -279,7 +279,8 @@ void radeon_pm_compute_clocks(struct radeon_device *rdev)
 	list_for_each_entry(connector,
 		&ddev->mode_config.connector_list, head) {
 		if (connector->encoder &&
-			connector->dpms != DRM_MODE_DPMS_OFF) {
+		    connector->encoder->crtc &&
+		    connector->dpms != DRM_MODE_DPMS_OFF) {
 			radeon_crtc = to_radeon_crtc(connector->encoder->crtc);
 			rdev->pm.active_crtcs |= (1 << radeon_crtc->crtc_id);
 			++count;