Re: [PATCH] serial: clps711x: Fix error handling in uart_clps711x_init()

[Greg KH <gregkh@linuxfoundation.org>]

On Thu, Nov 24, 2022 at 06:12:36AM +0000, Yuan Can wrote:
> The uart_clps711x_init() returns the platform_driver_register() directly
> without checking its return value, if platform_driver_register() failed,
> the clps711x_uart is not unregistered.
> 
> Fix by unregister clps711x_uart when platform_driver_register() failed.
> 
> Fixes: bc00024502ed ("serial: clps711x: Driver refactor")
> Signed-off-by: Yuan Can <yuancan@huawei.com>
> ---
>  drivers/tty/serial/clps711x.c | 8 +++++++-
>  1 file changed, 7 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/tty/serial/clps711x.c b/drivers/tty/serial/clps711x.c
> index 404b43a5ae33..d6284244da1d 100644
> --- a/drivers/tty/serial/clps711x.c
> +++ b/drivers/tty/serial/clps711x.c
> @@ -546,7 +546,13 @@ static int __init uart_clps711x_init(void)
>  	if (ret)
>  		return ret;
>  
> -	return platform_driver_register(&clps711x_uart_platform);
> +	ret = platform_driver_register(&clps711x_uart_platform);
> +	if (ret) {
> +		uart_unregister_driver(&clps711x_uart);
> +		return ret;
> +	}
> +
> +	return 0;

Minot nit, but this can be cleaned up to be even smaller:

	ret = platform_driver_register(&clps711x_uart_platform);
	if (ret)
		uart_unregister_driver(&clps711x_uart);

	return ret;

thanks,

greg k-h