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USB: usb-serial: Prepare for BKL push down

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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>
This commit is contained in:
Alan Cox 2008-02-20 20:47:56 +00:00 committed by Greg Kroah-Hartman
parent 3d01f0fe6b
commit 2097890c43
1 changed files with 9 additions and 2 deletions
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11
drivers/usb/serial/usb-serial.c
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@ -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)