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SubjectRe: [PATCH 3/3] tty/serial: atmel: manage shutdown in case of RS485 or ISO7816 mode
On Wed, Jul 11, 2018 at 03:16:38PM +0200, Ludovic Desroches wrote:
> From: Nicolas Ferre <nicolas.ferre@microchip.com>
>
> 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.
>
> Signed-off-by: Nicolas Ferre <nicolas.ferre@microchip.com>

No signed-off-by from you?

> ---
> drivers/tty/serial/atmel_serial.c | 4 +++-
> 1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/tty/serial/atmel_serial.c b/drivers/tty/serial/atmel_serial.c
> index 0118b219f3a8..e4f877e1f3c6 100644
> --- a/drivers/tty/serial/atmel_serial.c
> +++ b/drivers/tty/serial/atmel_serial.c
> @@ -617,7 +617,9 @@ static void atmel_stop_tx(struct uart_port *port)
> if (((port->rs485.flags & SER_RS485_ENABLED) &&
> !(port->rs485.flags & SER_RS485_RX_DURING_TX)) ||
> port->iso7816.flags & SER_ISO7816_ENABLED)
> - atmel_start_rx(port);
> + if (!atomic_read(&atmel_port->tasklet_shutdown))
> + atmel_start_rx(port);

Is this really ok? No locking needed? What happens if that value is
set right after this?

thanks,

greg k-h
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