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drm/mediatek: Check if fb is null
authorYongqiang Niu <yongqiang.niu@mediatek.com>
Mon, 11 Jan 2021 07:43:44 +0000 (15:43 +0800)
committerChun-Kuang Hu <chunkuang.hu@kernel.org>
Thu, 4 Feb 2021 14:52:55 +0000 (22:52 +0800)
commitb1d685b6467ac0d98fc63989f71b4ca9186be5d4
treeacdf235b465c192691e35c8763073b8cfc9803b8
parent5b9576e202e174ccd099e16b9e9367036247edb8
drm/mediatek: Check if fb is null

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

Fixes: b6b1bb980ec4 ("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>
drivers/gpu/drm/mediatek/mtk_disp_ovl.c