linux-kernel - Re: [PATCH] tty/serial: atmel: manage shutdown in case of RS485 or ISO7816 mode

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Message-ID: <f40181d1-3781-2cd9-11b3-420ef0d29ce7@gmail.com>
Date:   Wed, 12 Feb 2020 12:19:18 +0100
From:   Richard Genoud <richard.genoud@...il.com>
To:     Nicolas Ferre <nicolas.ferre@...rochip.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-serial@...r.kernel.org
Cc:     Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Ludovic Desroches <ludovic.desroches@...rochip.com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Codrin Ciubotariu <codrin.ciubotariu@...rochip.com>
Subject: Re: [PATCH] tty/serial: atmel: manage shutdown in case of RS485 or
 ISO7816 mode

Le 10/02/2020 à 16:20, Nicolas Ferre a écrit :
> In atmel_shutdown() we call atmel_stop_rx() and atmel_stop_tx() functions.
> Prevent the rx restart that is implemented in RS485 or ISO7816 modes when
> calling atmel_stop_tx() by using the atomic information tasklet_shutdown
> that is already in place for this purpose.
> 
> Fixes: 98f2082c3ac4 ("tty/serial: atmel: enforce tasklet init and termination sequences")
> Signed-off-by: Nicolas Ferre <nicolas.ferre@...rochip.com>

Acked-by: Richard Genoud <richard.genoud@...il.com>

> ---
>  drivers/tty/serial/atmel_serial.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/tty/serial/atmel_serial.c b/drivers/tty/serial/atmel_serial.c
> index c15c398c88a9..a39c87a7c2e1 100644
> --- a/drivers/tty/serial/atmel_serial.c
> +++ b/drivers/tty/serial/atmel_serial.c
> @@ -570,7 +570,8 @@ static void atmel_stop_tx(struct uart_port *port)
>  	atmel_uart_writel(port, ATMEL_US_IDR, atmel_port->tx_done_mask);
>  
>  	if (atmel_uart_is_half_duplex(port))
> -		atmel_start_rx(port);
> +		if (!atomic_read(&atmel_port->tasklet_shutdown))
> +			atmel_start_rx(port);
>  
>  }
>  
>