linux-kernel - RE: [PATCH 1/5] tty/serial: at91: correct check of buf used in DMA

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Date:	Fri, 27 Feb 2015 07:38:11 +0000
From:	"Zhao, Leilei" <Leilei.Zhao@...el.com>
To:	Jiri Slaby <jslaby@...e.cz>,
	"Ferre, Nicolas" <Nicolas.FERRE@...el.com>,
	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	"linux-serial@...r.kernel.org" <linux-serial@...r.kernel.org>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: RE: [PATCH 1/5] tty/serial: at91: correct check of buf used in DMA

Thanks

Best Regards
Zhao Leilei

-----Original Message-----
From: Jiri Slaby [mailto:jirislaby@...il.com] On Behalf Of Jiri Slaby
Sent: Thursday, February 26, 2015 17:30
To: Zhao, Leilei; Ferre, Nicolas; gregkh@...uxfoundation.org; linux-serial@...r.kernel.org
Cc: linux-kernel@...r.kernel.org; linux-arm-kernel@...ts.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@...el.com>
> Acked-by: Nicolas Ferre <nicolas.ferre@...el.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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