tty: sdio_uart: Fix the locking on "func" for new code

The new dtr_rts function didn't take the port->func lock as it should
so add use of the lock there.

Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/mmc/card/sdio_uart.c b/drivers/mmc/card/sdio_uart.c
index 2a13db5..f537555 100644 (file)
--- a/drivers/mmc/card/sdio_uart.c
+++ b/drivers/mmc/card/sdio_uart.c
@@ -603,10 +603,14 @@ static void uart_dtr_rts(struct tty_port *tport, int onoff)
 {
        struct sdio_uart_port *port =
                        container_of(tport, struct sdio_uart_port, port);
+       int ret = sdio_uart_claim_func(port);
+       if (ret)
+               return;
        if (onoff == 0)
                sdio_uart_clear_mctrl(port, TIOCM_DTR | TIOCM_RTS);
        else
                sdio_uart_set_mctrl(port, TIOCM_DTR | TIOCM_RTS);
+       sdio_uart_release_func(port);
 }
 
 /**