Hi Kefeng,
On Fri, May 31 2019, Kefeng Wang wrote:
> 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 <hulkci@xxxxxxxxxx>
> Signed-off-by: Kefeng Wang <wangkefeng.wang@xxxxxxxxxx>
Acked-by: Baruch Siach <baruch@xxxxxxxxxx>
Thanks,
baruch
> ---
> 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 f460cca139e2..13ac36e2da4f 100644
> --- a/drivers/tty/serial/digicolor-usart.c
> +++ b/drivers/tty/serial/digicolor-usart.c
> @@ -541,7 +541,11 @@ 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);
--
http://baruch.siach.name/blog/ ~. .~ Tk Open Systems
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