[PATCH] drm/panthor: Check debugfs GEM lock initialization

[Linmao Li]

drmm_mutex_init() can fail while registering the managed cleanup action.
When that happens, drmm_add_action_or_reset() destroys the mutex before
returning the error. Continuing initialization would therefore leave the
debugfs GEM object list with an unusable lock.

Propagate the error as is already done for the other managed mutexes in
panthor_device_init().

Fixes: a3707f53eb3f ("drm/panthor: show device-wide list of DRM GEM objects 
over DebugFS")
Signed-off-by: Linmao Li <lilin...@kylinos.cn>
---
 drivers/gpu/drm/panthor/panthor_device.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/panthor/panthor_device.c 
b/drivers/gpu/drm/panthor/panthor_device.c
index 0b25abebb803..9687c59de350 100644
--- a/drivers/gpu/drm/panthor/panthor_device.c
+++ b/drivers/gpu/drm/panthor/panthor_device.c
@@ -182,7 +182,10 @@ int panthor_device_init(struct panthor_device *ptdev)
                return ret;
 
 #ifdef CONFIG_DEBUG_FS
-       drmm_mutex_init(&ptdev->base, &ptdev->gems.lock);
+       ret = drmm_mutex_init(&ptdev->base, &ptdev->gems.lock);
+       if (ret)
+               return ret;
+
        INIT_LIST_HEAD(&ptdev->gems.node);
 #endif
 
-- 
2.25.1