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drm/mediatek: Check if fb is null

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[ Upstream commit b1d685b646 ]

It's possible that state->base.fb is null. Add a check before access its
format.

Fixes: b6b1bb980e ("drm/mediatek: Turn off Alpha bit when plane format has no alpha")
Signed-off-by: Yongqiang Niu <yongqiang.niu@mediatek.com>
Signed-off-by: Chun-Kuang Hu <chunkuang.hu@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Yongqiang Niu 2021-01-11 15:43:44 +08:00 committed by Greg Kroah-Hartman
parent d87df78aab
commit bed8bed041
1 changed files with 1 additions and 1 deletions
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2
drivers/gpu/drm/mediatek/mtk_disp_ovl.c
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@ -266,7 +266,7 @@ static void mtk_ovl_layer_config(struct mtk_ddp_comp *comp, unsigned int idx,
}
con = ovl_fmt_convert(ovl, fmt);
if (state->base.fb->format->has_alpha)
if (state->base.fb && state->base.fb->format->has_alpha)
con |= OVL_CON_AEN | OVL_CON_ALPHA;
if (pending->rotation & DRM_MODE_REFLECT_Y) {