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authorAlan Cox <alan@lxorguk.ukuu.org.uk>2008-02-20 20:47:56 +0000
committerGreg Kroah-Hartman <gregkh@suse.de>2008-04-24 21:16:38 -0700
commit2097890c43a8fe90763f31b0010fd6963f5512c8 (patch)
tree7daf617d0518639fb9b1e752c435ab8c9acf2173 /drivers
parent3d01f0fe6b66dd34511eaf35e06764b8997187bc (diff)
USB: usb-serial: Prepare for BKL push down
Take the lock in usb-serial instead. As it relies on the BKL internally we can't push it any deeper yet. Signed-off-by: Alan Cox <alan@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers')
-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 2138ba8aeb6..aea861e9173 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)