Re: [PATCH] drm/ingenic: Fix missing platform_driver_unregister() call in ingenic_drm_init()

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Hi Yuan,

Le jeu. 3 nov. 2022 à 14:01:48 +0000, Yuan Can <yuancan@xxxxxxxxxx> a écrit :
A problem about modprobe ingenic-drm failed is triggered with the following
log given:

[ 303.561088] Error: Driver 'ingenic-ipu' is already registered, aborting... modprobe: ERROR: could not insert 'ingenic_drm': Device or resource busy

The reason is that ingenic_drm_init() returns platform_driver_register() directly without checking its return value, if platform_driver_register() failed, it returns without unregistering ingenic_ipu_driver_ptr, resulting
the ingenic-drm can never be installed later.
A simple call graph is shown as below:

 ingenic_drm_init()
   platform_driver_register() # ingenic_ipu_driver_ptr are registered
   platform_driver_register()
     driver_register()
       bus_add_driver()
         priv = kzalloc(...) # OOM happened
   # return without unregister ingenic_ipu_driver_ptr

Fixing this problem by checking the return value of
platform_driver_register() and do platform_unregister_drivers() if
error happened.

Fixes: fc1acf317b01 ("drm/ingenic: Add support for the IPU")
Signed-off-by: Yuan Can <yuancan@xxxxxxxxxx>

Missing a Cc: to linux-stable, no?

Cheers,
-Paul

---
 drivers/gpu/drm/ingenic/ingenic-drm-drv.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/ingenic/ingenic-drm-drv.c b/drivers/gpu/drm/ingenic/ingenic-drm-drv.c
index ab0515d2c420..4499a04f7c13 100644
--- a/drivers/gpu/drm/ingenic/ingenic-drm-drv.c
+++ b/drivers/gpu/drm/ingenic/ingenic-drm-drv.c
@@ -1629,7 +1629,11 @@ static int ingenic_drm_init(void)
 			return err;
 	}

-	return platform_driver_register(&ingenic_drm_driver);
+	err = platform_driver_register(&ingenic_drm_driver);
+	if (IS_ENABLED(CONFIG_DRM_INGENIC_IPU) && err)
+		platform_driver_unregister(ingenic_ipu_driver_ptr);
+
+	return err;
 }
 module_init(ingenic_drm_init);

--
2.17.1







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