drm/radeon/hdmi: make sure we have an afmt block assigned

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@amd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2 files changed, 12 insertions, 0 deletions

diff --git a/drivers/gpu/drm/radeon/evergreen_hdmi.c b/drivers/gpu/drm/radeon/evergreen_hdmi.c
index b9c6f7675e59..b0d3fb341417 100644
--- a/drivers/gpu/drm/radeon/evergreen_hdmi.c
+++ b/drivers/gpu/drm/radeon/evergreen_hdmi.c
@@ -177,6 +177,9 @@ void evergreen_hdmi_setmode(struct drm_encoder *encoder, struct drm_display_mode
         uint32_t offset;
         ssize_t err;
 
+        if (!dig || !dig->afmt)
+                return;
+
         /* Silent, r600_hdmi_enable will raise WARN for us */
         if (!dig->afmt->enabled)
                 return;
@@ -280,6 +283,9 @@ void evergreen_hdmi_enable(struct drm_encoder *encoder, bool enable)
         struct radeon_encoder *radeon_encoder = to_radeon_encoder(encoder);
         struct radeon_encoder_atom_dig *dig = radeon_encoder->enc_priv;
 
+        if (!dig || !dig->afmt)
+                return;
+
         /* Silent, r600_hdmi_enable will raise WARN for us */
         if (enable && dig->afmt->enabled)
                 return;
diff --git a/drivers/gpu/drm/radeon/r600_hdmi.c b/drivers/gpu/drm/radeon/r600_hdmi.c
index e73b2a73494a..f48240bb8c56 100644
--- a/drivers/gpu/drm/radeon/r600_hdmi.c
+++ b/drivers/gpu/drm/radeon/r600_hdmi.c
@@ -266,6 +266,9 @@ void r600_hdmi_setmode(struct drm_encoder *encoder, struct drm_display_mode *mod
         uint32_t offset;
         ssize_t err;
 
+        if (!dig || !dig->afmt)
+                return;
+
         /* Silent, r600_hdmi_enable will raise WARN for us */
         if (!dig->afmt->enabled)
                 return;
@@ -448,6 +451,9 @@ void r600_hdmi_enable(struct drm_encoder *encoder, bool enable)
         struct radeon_encoder_atom_dig *dig = radeon_encoder->enc_priv;
         u32 hdmi = HDMI0_ERROR_ACK;
 
+        if (!dig || !dig->afmt)
+                return;
+
         /* Silent, r600_hdmi_enable will raise WARN for us */
         if (enable && dig->afmt->enabled)
                 return;