[ Upstream commit c7ad9ba0611c53cfe194223db02e3bca015f0674 ] When modprobe/rmmod/modprobe module, if platform_driver_register() fails, the kernel complained,
proc_dir_entry 'driver/digicolor-usart' already registered WARNING: CPU: 1 PID: 5636 at fs/proc/generic.c:360 proc_register+0x19d/0x270 Fix this by adding uart_unregister_driver() when platform_driver_register() fails. Reported-by: Hulk Robot <hul...@huawei.com> Signed-off-by: Kefeng Wang <wangkefeng.w...@huawei.com> Acked-by: Baruch Siach <bar...@tkos.co.il> Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org> Signed-off-by: Sasha Levin <sas...@kernel.org> --- drivers/tty/serial/digicolor-usart.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/drivers/tty/serial/digicolor-usart.c b/drivers/tty/serial/digicolor-usart.c index a80cdad114f3..d8cb94997487 100644 --- a/drivers/tty/serial/digicolor-usart.c +++ b/drivers/tty/serial/digicolor-usart.c @@ -544,7 +544,11 @@ static int __init digicolor_uart_init(void) if (ret) return ret; - return platform_driver_register(&digicolor_uart_platform); + ret = platform_driver_register(&digicolor_uart_platform); + if (ret) + uart_unregister_driver(&digicolor_uart); + + return ret; } module_init(digicolor_uart_init); -- 2.20.1