drm/vc4: Fix missing platform_unregister_drivers() call in vc4_drm_register()

[ Upstream commit cf53db768a8790fdaae2fa3a81322b080285f7e5 ]

A problem about modprobe vc4 failed is triggered with the following log
given:

 [  420.327987] Error: Driver 'vc4_hvs' is already registered, aborting...
 [  420.333904] failed to register platform driver vc4_hvs_driver [vc4]: -16
 modprobe: ERROR: could not insert 'vc4': Device or resource busy

The reason is that vc4_drm_register() returns platform_driver_register()
directly without checking its return value, if platform_driver_register()
fails, it returns without unregistering all the vc4 drivers, resulting the
vc4 can never be installed later.
A simple call graph is shown as below:

 vc4_drm_register()
   platform_register_drivers() # all vc4 drivers are registered
   platform_driver_register()
     driver_register()
       bus_add_driver()
         priv = kzalloc(...) # OOM happened
   # return without unregister drivers

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

Fixes: c8b75bca92cb ("drm/vc4: Add KMS support for Raspberry Pi.")
Signed-off-by: Yuan Can <yuancan@huawei.com>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://patchwork.freedesktop.org/patch/msgid/20221103014705.109322-1-yuancan@huawei.com
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/gpu/drm/vc4/vc4_drv.c b/drivers/gpu/drm/vc4/vc4_drv.c
index d216a1f..099df15 100644 (file)
--- a/drivers/gpu/drm/vc4/vc4_drv.c
+++ b/drivers/gpu/drm/vc4/vc4_drv.c
@@ -383,7 +383,12 @@ static int __init vc4_drm_register(void)
        if (ret)
                return ret;
 
-       return platform_driver_register(&vc4_platform_driver);
+       ret = platform_driver_register(&vc4_platform_driver);
+       if (ret)
+               platform_unregister_drivers(component_drivers,
+                                           ARRAY_SIZE(component_drivers));
+
+       return ret;
 }
 
 static void __exit vc4_drm_unregister(void)