[PATCH] drm/i915/display: Avoid divide by zero

[Juha-Pekka Heikkila]

skl_crtc_allocate_plane_ddb allow iter.data_rate to be zero
which could cause divide by zero in skl_allocate_plane_ddb,
check against that.

Signed-off-by: Juha-Pekka Heikkila <juhapekka.heikkila at gmail.com>
---
 drivers/gpu/drm/i915/display/skl_watermark.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/display/skl_watermark.c b/drivers/gpu/drm/i915/display/skl_watermark.c
index def5150231a4..403783504ab3 100644
--- a/drivers/gpu/drm/i915/display/skl_watermark.c
+++ b/drivers/gpu/drm/i915/display/skl_watermark.c
@@ -1388,7 +1388,7 @@ skl_allocate_plane_ddb(struct skl_plane_ddb_iter *iter,
 {
 	u16 size, extra = 0;
 
-	if (data_rate) {
+	if (data_rate && iter->data_rate) {
 		extra = min_t(u16, iter->size,
 			      DIV64_U64_ROUND_UP(iter->size * data_rate,
 						 iter->data_rate));
-- 
2.43.0