[PATCH 020/106] drm/radeon/hdmi: make sure we have an afmt block assigned

[Luis Henriques]

3.5.7.18 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Alex Deucher <alexander.deucher@xxxxxxx>

commit c2b4cacfe9816c1fe378c785ce8a678cf0635ec6 upstream.

Prevents a segfault if an afmt block is not assigned to the
encoder such as in the LVDS or eDP case.

Fixes:
https://bugs.freedesktop.org/show_bug.cgi?id=66714

Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
[ luis: backported to 3.5:
  - adjusted context
  - dropped changes to evergreen_hdmi_enable() ]
Signed-off-by: Luis Henriques <luis.henriques@xxxxxxxxxxxxx>
---
 drivers/gpu/drm/radeon/evergreen_hdmi.c | 3 +++
 drivers/gpu/drm/radeon/r600_hdmi.c      | 6 ++++++
 2 files changed, 9 insertions(+)

diff --git a/drivers/gpu/drm/radeon/evergreen_hdmi.c b/drivers/gpu/drm/radeon/evergreen_hdmi.c
index 65c5416..44b3b07 100644
--- a/drivers/gpu/drm/radeon/evergreen_hdmi.c
+++ b/drivers/gpu/drm/radeon/evergreen_hdmi.c
@@ -156,6 +156,9 @@ void evergreen_hdmi_setmode(struct drm_encoder *encoder, struct drm_display_mode
 	struct radeon_encoder_atom_dig *dig = radeon_encoder->enc_priv;
 	uint32_t offset;
 
+	if (!dig || !dig->afmt)
+		return;
+
 	/* Silent, r600_hdmi_enable will raise WARN for us */
 	if (!dig->afmt->enabled)
 		return;
diff --git a/drivers/gpu/drm/radeon/r600_hdmi.c b/drivers/gpu/drm/radeon/r600_hdmi.c
index 26ce6c1..949bf83 100644
--- a/drivers/gpu/drm/radeon/r600_hdmi.c
+++ b/drivers/gpu/drm/radeon/r600_hdmi.c
@@ -322,6 +322,9 @@ void r600_hdmi_setmode(struct drm_encoder *encoder, struct drm_display_mode *mod
 	struct radeon_encoder_atom_dig *dig = radeon_encoder->enc_priv;
 	uint32_t offset;
 
+	if (!dig || !dig->afmt)
+		return;
+
 	/* Silent, r600_hdmi_enable will raise WARN for us */
 	if (!dig->afmt->enabled)
 		return;
@@ -480,6 +483,9 @@ void r600_hdmi_enable(struct drm_encoder *encoder)
 	uint32_t offset;
 	u32 hdmi;
 
+	if (!dig || !dig->afmt)
+		return;
+
 	if (ASIC_IS_DCE6(rdev))
 		return;
 
-- 
1.8.3.2

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