tty/serial: atmel: manage shutdown in case of RS485 or ISO7816 mode
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>
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@ -570,6 +570,7 @@ static void atmel_stop_tx(struct uart_port *port)
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atmel_uart_writel(port, ATMEL_US_IDR, atmel_port->tx_done_mask);
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if (atmel_uart_is_half_duplex(port))
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if (!atomic_read(&atmel_port->tasklet_shutdown))
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atmel_start_rx(port);
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}
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