[patch] serial: stm32: fix a type issue

[Gerald Baeza]

Hi Dan and thanks for the patch

On 10/12/2016 08:21 AM, Dan Carpenter wrote:
> We store UNDEF_REG in a u8.  It causes a problem in functions like
> stm32_tx_dma_complete() where we check "if (ofs->icr == UNDEF_REG)".
>
> Fixes: 3489187204eb ('serial: stm32: adding dma support')
> Signed-off-by: Dan Carpenter <dan.carpenter at oracle.com>
>
> diff --git a/drivers/tty/serial/stm32-usart.h b/drivers/tty/serial/stm32-usart.h
> index 41d9749..f9887cc 100644
> --- a/drivers/tty/serial/stm32-usart.h
> +++ b/drivers/tty/serial/stm32-usart.h
> @@ -31,7 +31,7 @@ struct stm32_usart_info {
>  	struct stm32_usart_config cfg;
>  };
>
> -#define UNDEF_REG ~0
> +#define UNDEF_REG 0xFF
>
>  /* Register offsets */
>  struct stm32_usart_info stm32f4_info = {
>

Reviewed-by: Gerald Baeza <gerald.baeza at st.com>