From: Gaosheng Cui <cuigaosheng1@xxxxxxxxxx>
[ Upstream commit dba9e3467425800f9d3a14e8b6a0f85c731c1650 ]
The drm_atomic_get_new_private_obj_state() function returns NULL
on error path, drm_atomic_get_old_private_obj_state() function
returns NULL on error path, too, they does not return error pointers.
By the way, vc4_hvs_get_new/old_global_state() should return
ERR_PTR(-EINVAL), otherwise there will be null-ptr-defer issue,
such as follows:
In function vc4_atomic_commit_tail():
|-- old_hvs_state = vc4_hvs_get_old_global_state(state); <-- return NULL
|-- if (WARN_ON(IS_ERR(old_hvs_state))) <-- no return
|-- unsigned long state_rate = max(old_hvs_state->core_clock_rate,
new_hvs_state->core_clock_rate); <-- null-ptr-defer
Fixes: 9ec03d7f1ed3 ("drm/vc4: kms: Wait on previous FIFO users before a commit")
Signed-off-by: Gaosheng Cui <cuigaosheng1@xxxxxxxxxx>
Signed-off-by: Maxime Ripard <maxime@xxxxxxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/20221110094445.2930509-6-cuigaosheng1@xxxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/gpu/drm/vc4/vc4_kms.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/drivers/gpu/drm/vc4/vc4_kms.c b/drivers/gpu/drm/vc4/vc4_kms.c
index b45dcdfd7306..a3678178b022 100644
--- a/drivers/gpu/drm/vc4/vc4_kms.c
+++ b/drivers/gpu/drm/vc4/vc4_kms.c
@@ -198,8 +198,8 @@ vc4_hvs_get_new_global_state(struct drm_atomic_state *state)
struct drm_private_state *priv_state;
priv_state = drm_atomic_get_new_private_obj_state(state, &vc4->hvs_channels);
- if (IS_ERR(priv_state))
- return ERR_CAST(priv_state);
+ if (!priv_state)
+ return ERR_PTR(-EINVAL);
return to_vc4_hvs_state(priv_state);
}
@@ -211,8 +211,8 @@ vc4_hvs_get_old_global_state(struct drm_atomic_state *state)
struct drm_private_state *priv_state;
priv_state = drm_atomic_get_old_private_obj_state(state, &vc4->hvs_channels);
- if (IS_ERR(priv_state))
- return ERR_CAST(priv_state);
+ if (!priv_state)
+ return ERR_PTR(-EINVAL);
return to_vc4_hvs_state(priv_state);
}
--
2.35.1
