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path: root/drivers/usb/serial
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Diffstat (limited to 'drivers/usb/serial')
-rw-r--r--drivers/usb/serial/usb-serial.c11
1 files changed, 9 insertions, 2 deletions
diff --git a/drivers/usb/serial/usb-serial.c b/drivers/usb/serial/usb-serial.c
index 2138ba8aeb69..aea861e9173e 100644
--- a/drivers/usb/serial/usb-serial.c
+++ b/drivers/usb/serial/usb-serial.c
@@ -401,11 +401,13 @@ static int serial_ioctl (struct tty_struct *tty, struct file * file, unsigned in
struct usb_serial_port *port = tty->driver_data;
int retval = -ENODEV;
+ lock_kernel();
if (!port)
goto exit;
dbg("%s - port %d, cmd 0x%.4x", __FUNCTION__, port->number, cmd);
+ /* Caution - port->open_count is BKL protected */
if (!port->open_count) {
dbg ("%s - port not open", __FUNCTION__);
goto exit;
@@ -416,8 +418,8 @@ static int serial_ioctl (struct tty_struct *tty, struct file * file, unsigned in
retval = port->serial->type->ioctl(port, file, cmd, arg);
else
retval = -ENOIOCTLCMD;
-
exit:
+ unlock_kernel();
return retval;
}
@@ -446,19 +448,24 @@ static void serial_break (struct tty_struct *tty, int break_state)
{
struct usb_serial_port *port = tty->driver_data;
- if (!port)
+ lock_kernel();
+ if (!port) {
+ unlock_kernel();
return;
+ }
dbg("%s - port %d", __FUNCTION__, port->number);
if (!port->open_count) {
dbg("%s - port not open", __FUNCTION__);
+ unlock_kernel();
return;
}
/* pass on to the driver specific version of this function if it is available */
if (port->serial->type->break_ctl)
port->serial->type->break_ctl(port, break_state);
+ unlock_kernel();
}
static int serial_read_proc (char *page, char **start, off_t off, int count, int *eof, void *data)