[RFC PATCH v3 2/4] drm/msm: Check for NULL before calling prepare_commit()

[Jessica Zhang]

Add a NULL check before calling prepare_commit() in
msm_atomic_commit_tail()

Signed-off-by: Jessica Zhang <quic_jessz...@quicinc.com>
Reviewed-by: Dmitry Baryshkov <dmitry.barysh...@linaro.org>
---
 drivers/gpu/drm/msm/msm_atomic.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/msm/msm_atomic.c b/drivers/gpu/drm/msm/msm_atomic.c
index 1686fbb611fd..c8a0a5cc5ca5 100644
--- a/drivers/gpu/drm/msm/msm_atomic.c
+++ b/drivers/gpu/drm/msm/msm_atomic.c
@@ -206,7 +206,8 @@ void msm_atomic_commit_tail(struct drm_atomic_state *state)
         * Now that there is no in-progress flush, prepare the
         * current update:
         */
-       kms->funcs->prepare_commit(kms, state);
+       if (kms->funcs->prepare_commit)
+               kms->funcs->prepare_commit(kms, state);
 
        /*
         * Push atomic updates down to hardware:
-- 
2.39.1