[PATCH 5.12 409/677] drm/amd/display: check fb of primary plane

[Greg Kroah-Hartman]

From: Sefa Eyeoglu <contact@xxxxxxxxxxxxx>

[ Upstream commit 7df4ceb60fa9a3c5160cfd5b696657291934a2c9 ]

Sometimes the primary plane might not be initialized (yet), which
causes dm_check_crtc_cursor to divide by zero.
Apparently a weird state before a S3-suspend causes the aforementioned
divide-by-zero error when resuming from S3.  This was explained in
bug 212293 on Bugzilla.

To avoid this divide-by-zero error we check if the primary plane's fb
isn't NULL.  If it's NULL the src_w and src_h attributes will be 0,
which would cause a divide-by-zero.

This fixes Bugzilla report 212293
Bug: https://bugzilla.kernel.org/show_bug.cgi?id=212293

Fixes: 12f4849a1cfd69f3 ("drm/amd/display: check cursor scaling")
Reviewed-by: Simon Ser <contact@xxxxxxxxxxx>
Reviewed-by: Harry Wentland <harry.wentland@xxxxxxx>
Signed-off-by: Sefa Eyeoglu <contact@xxxxxxxxxxxxx>
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
index 2e42cdea6927..71e07ebc8f88 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -9295,7 +9295,8 @@ static int dm_check_crtc_cursor(struct drm_atomic_state *state,
 
 	new_cursor_state = drm_atomic_get_new_plane_state(state, crtc->cursor);
 	new_primary_state = drm_atomic_get_new_plane_state(state, crtc->primary);
-	if (!new_cursor_state || !new_primary_state || !new_cursor_state->fb) {
+	if (!new_cursor_state || !new_primary_state ||
+	    !new_cursor_state->fb || !new_primary_state->fb) {
 		return 0;
 	}
 
-- 
2.30.2