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Commit 6807593e authored by Nicolas Ferre's avatar Nicolas Ferre Committed by Greg Kroah-Hartman
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tty/serial: atmel: manage shutdown in case of RS485 or ISO7816 mode 



commit 04b5bfe3dc94e64d0590c54045815cb5183fb095 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: 98f2082c ("tty/serial: atmel: enforce tasklet init and termination sequences")
Signed-off-by: default avatarNicolas 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: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent f4e6d51f

drivers/tty/serial/atmel_serial.c

+2 −1
Original line number Diff line number Diff line
@@ -490,6 +490,7 @@ 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))

		if (!atomic_read(&atmel_port->tasklet_shutdown))

			atmel_start_rx(port);



}