serial: Take uart port lock for direct *_enable_ms()
Three UART drivers (8250, atmel & amba-pl010) directly call their
enable_ms() method; the uart port lock must be acquired before
any h/w programming.
Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/tty/serial/amba-pl010.c b/drivers/tty/serial/amba-pl010.c
index 230bc7a..194108b 100644
--- a/drivers/tty/serial/amba-pl010.c
+++ b/drivers/tty/serial/amba-pl010.c
@@ -483,7 +483,9 @@
{
if (termios->c_line == N_PPS) {
port->flags |= UPF_HARDPPS_CD;
+ spin_lock_irq(&port->lock);
pl010_enable_ms(port);
+ spin_unlock_irq(&port->lock);
} else
port->flags &= ~UPF_HARDPPS_CD;
}