1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/usb/serial/mos7840.c b/drivers/usb/serial/mos7840.c
index fda4a6421c44..96a8c7713212 100644
--- a/drivers/usb/serial/mos7840.c
+++ b/drivers/usb/serial/mos7840.c
@@ -1343,6 +1343,7 @@ static void mos7840_break(struct tty_struct *tty, int break_state)
         else
                 data = mos7840_port->shadowLCR & ~LCR_SET_BREAK;
 
+        /* FIXME: no locking on shadowLCR anywhere in driver */
         mos7840_port->shadowLCR = data;
         dbg("mcs7840_break mos7840_port->shadowLCR is %x\n",
             mos7840_port->shadowLCR);
@@ -2214,10 +2215,12 @@ static int mos7840_set_modem_info(struct moschip_port *mos7840_port,
                 break;
         }
 
+        lock_kernel();
         mos7840_port->shadowMCR = mcr;
 
         Data = mos7840_port->shadowMCR;
         status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
+        unlock_kernel();
         if (status < 0) {
                 dbg("setting MODEM_CONTROL_REGISTER Failed\n");
                 return -1;