tty/serial: at91: fix race condition in atmel_serial_remove

The _remove callback could be called when a tasklet is scheduled. tasklet_kill
was called inside the function in order to free up any scheduled tasklets.
However it was called after uart_remove_one_port which destroys tty references
needed in the port for atmel_tasklet_func.
Simply putting the tasklet_kill at the start of the function will prevent this
conflict.

Signed-off-by: Marek Roszko <mark.roszko@gmail.com>
Acked-by: Leilei Zhao <leilei.zhao@atmel.com>
Cc: <stable@vger.kernel.org> # v3.12
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/tty/serial/atmel_serial.c b/drivers/tty/serial/atmel_serial.c
index 48ea47a32d5f85874ea41e65d1e10175aa03df50..c421d11b3d4c884afd13701d03b0d8ea24981460 100644 (file)
--- a/drivers/tty/serial/atmel_serial.c
+++ b/drivers/tty/serial/atmel_serial.c
@@ -2447,11 +2447,12 @@ static int atmel_serial_remove(struct platform_device *pdev)
        struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
        int ret = 0;
 
+       tasklet_kill(&atmel_port->tasklet);
+
        device_init_wakeup(&pdev->dev, 0);
 
        ret = uart_remove_one_port(&atmel_uart, port);
 
-       tasklet_kill(&atmel_port->tasklet);
        kfree(atmel_port->rx_ring.buf);
 
        /* "port" is allocated statically, so we shouldn't free it */