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tty/serial: atmel: manage shutdown in case of RS485 or ISO7816 mode 

commit 04b5bfe3dc upstream.

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: 98f2082c3a ("tty/serial: atmel: enforce tasklet init and termination sequences")
Signed-off-by: Nicolas Ferre <nicolas.ferre@microchip.com>
Cc: stable <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20200210152053.8289-1-nicolas.ferre@microchip.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
5.4-rM2-2.2.x-imx-squashed
Nicolas Ferre 2020-02-10 16:20:53 +01:00 committed by Greg Kroah-Hartman
parent 5ae6e56837
commit 671ea19c32
1 changed files with 2 additions and 1 deletions
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3
drivers/tty/serial/atmel_serial.c
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@ -574,7 +574,8 @@ 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);
}