From: Yuan Can yuancan@huawei.com
[ Upstream commit b434422c45282a0573d8123239abc41fa72665d4 ]
A problem about modprobe s5p_fimc failed is triggered with the following log given:
[ 272.075275] Error: Driver 'exynos4-fimc' is already registered, aborting... modprobe: ERROR: could not insert 's5p_fimc': Device or resource busy
The reason is that fimc_md_init() returns platform_driver_register() directly without checking its return value, if platform_driver_register() failed, it returns without unregister fimc_driver, resulting the s5p_fimc can never be installed later. A simple call graph is shown as below:
fimc_md_init() fimc_register_driver() # register fimc_driver platform_driver_register() platform_driver_register() driver_register() bus_add_driver() dev = kzalloc(...) # OOM happened # return without unregister fimc_driver
Fix by unregister fimc_driver when platform_driver_register() returns error.
Fixes: d3953223b090 ("[media] s5p-fimc: Add the media device driver") Signed-off-by: Yuan Can yuancan@huawei.com Signed-off-by: Hans Verkuil hverkuil-cisco@xs4all.nl Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/media/platform/exynos4-is/fimc-core.c | 2 +- drivers/media/platform/exynos4-is/media-dev.c | 6 +++++- 2 files changed, 6 insertions(+), 2 deletions(-)
diff --git a/drivers/media/platform/exynos4-is/fimc-core.c b/drivers/media/platform/exynos4-is/fimc-core.c index cde60fbb23a8..5b06c83f5c99 100644 --- a/drivers/media/platform/exynos4-is/fimc-core.c +++ b/drivers/media/platform/exynos4-is/fimc-core.c @@ -1231,7 +1231,7 @@ int __init fimc_register_driver(void) return platform_driver_register(&fimc_driver); }
-void __exit fimc_unregister_driver(void) +void fimc_unregister_driver(void) { platform_driver_unregister(&fimc_driver); } diff --git a/drivers/media/platform/exynos4-is/media-dev.c b/drivers/media/platform/exynos4-is/media-dev.c index a07d796f63df..707feb35a950 100644 --- a/drivers/media/platform/exynos4-is/media-dev.c +++ b/drivers/media/platform/exynos4-is/media-dev.c @@ -1581,7 +1581,11 @@ static int __init fimc_md_init(void) if (ret) return ret;
- return platform_driver_register(&fimc_md_driver); + ret = platform_driver_register(&fimc_md_driver); + if (ret) + fimc_unregister_driver(); + + return ret; }
static void __exit fimc_md_exit(void)