drm/radeon: check for 0 count in speaker allocation and SAD code

If there is no speaker allocation block or SAD block, bail
early.

bug:
https://bugs.freedesktop.org/show_bug.cgi?id=72283

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org

diff --git a/drivers/gpu/drm/radeon/dce6_afmt.c b/drivers/gpu/drm/radeon/dce6_afmt.c
index ab59fd7..713a5d3 100644 (file)
--- a/drivers/gpu/drm/radeon/dce6_afmt.c
+++ b/drivers/gpu/drm/radeon/dce6_afmt.c
@@ -174,7 +174,7 @@ void dce6_afmt_write_speaker_allocation(struct drm_encoder *encoder)
        }
 
        sad_count = drm_edid_to_speaker_allocation(radeon_connector->edid, &sadb);
-       if (sad_count < 0) {
+       if (sad_count <= 0) {
                DRM_ERROR("Couldn't read Speaker Allocation Data Block: %d\n", sad_count);
                return;
        }
@@ -235,7 +235,7 @@ void dce6_afmt_write_sad_regs(struct drm_encoder *encoder)
        }
 
        sad_count = drm_edid_to_sad(radeon_connector->edid, &sads);
-       if (sad_count < 0) {
+       if (sad_count <= 0) {
                DRM_ERROR("Couldn't read SADs: %d\n", sad_count);
                return;
        }

diff --git a/drivers/gpu/drm/radeon/evergreen_hdmi.c b/drivers/gpu/drm/radeon/evergreen_hdmi.c
index aa695c4..0c6d5ce 100644 (file)
--- a/drivers/gpu/drm/radeon/evergreen_hdmi.c
+++ b/drivers/gpu/drm/radeon/evergreen_hdmi.c
@@ -118,7 +118,7 @@ static void dce4_afmt_write_speaker_allocation(struct drm_encoder *encoder)
        }
 
        sad_count = drm_edid_to_speaker_allocation(radeon_connector->edid, &sadb);
-       if (sad_count < 0) {
+       if (sad_count <= 0) {
                DRM_ERROR("Couldn't read Speaker Allocation Data Block: %d\n", sad_count);
                return;
        }
@@ -173,7 +173,7 @@ static void evergreen_hdmi_write_sad_regs(struct drm_encoder *encoder)
        }
 
        sad_count = drm_edid_to_sad(radeon_connector->edid, &sads);
-       if (sad_count < 0) {
+       if (sad_count <= 0) {
                DRM_ERROR("Couldn't read SADs: %d\n", sad_count);
                return;
        }