linux-kernel - Re: [PATCH V2 1/2] tty: serial: imx: add lock for registers save/restore

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Date:   Wed, 5 Sep 2018 07:54:27 +0200
From:   Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>
To:     Anson Huang <Anson.Huang@....com>
Cc:     gregkh@...uxfoundation.org, jslaby@...e.com,
        linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org,
        Linux-imx@....com
Subject: Re: [PATCH V2 1/2] tty: serial: imx: add lock for registers
 save/restore

Hello,

On Wed, Sep 05, 2018 at 09:24:26AM +0800, Anson Huang wrote:
> In noirq suspend/resume stage with no_console_suspend enabled,
> imx_uart_console_write() may be called to print out log_buf
> message by printk(), so there will be race condition between
> imx_uart_console_write() and imx_uart_save/restore_context(),
> need to add lock to protect the registers save/restore operations.
> 
> Signed-off-by: Anson Huang <Anson.Huang@....com>
> ---
>  drivers/tty/serial/imx.c | 12 +++++++++++-
>  1 file changed, 11 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
> index 239c0fa..c15332d 100644

Acked-by: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>

Thanks
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
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