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SubjectRE: [PATCH 1/5] tty/serial: at91: correct check of buf used in DMA
Date
Thanks

Best Regards
Zhao Leilei

-----Original Message-----
From: Jiri Slaby [mailto:jirislaby@gmail.com] On Behalf Of Jiri Slaby
Sent: Thursday, February 26, 2015 17:30
To: Zhao, Leilei; Ferre, Nicolas; gregkh@linuxfoundation.org; linux-serial@vger.kernel.org
Cc: linux-kernel@vger.kernel.org; linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH 1/5] tty/serial: at91: correct check of buf used in DMA

On 02/26/2015, 07:55 AM, Leilei Zhao wrote:
> We only use buf of ring In DMA rx function while using buf of xmit in
> DMA tx function. So here we need definitively to check the buf of ring
> which is corresponding to DMA rx function.
>
> Signed-off-by: Leilei Zhao <leilei.zhao@atmel.com>
> Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
> ---
> drivers/tty/serial/atmel_serial.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/tty/serial/atmel_serial.c
> b/drivers/tty/serial/atmel_serial.c
> index 846552b..460903c 100644
> --- a/drivers/tty/serial/atmel_serial.c
> +++ b/drivers/tty/serial/atmel_serial.c
> @@ -1027,7 +1027,7 @@ static int atmel_prepare_rx_dma(struct uart_port *port)
> spin_lock_init(&atmel_port->lock_rx);
> sg_init_table(&atmel_port->sg_rx, 1);
> /* UART circular rx buffer is an aligned page. */
> - BUG_ON((int)port->state->xmit.buf & ~PAGE_MASK);
> + BUG_ON((int)ring->buf & ~PAGE_MASK);

Please use PAGE_ALIGNED. This will also make the bad (int) cast to dismiss.

thanks,
--
js
suse labs


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