From alan@lxorguk.ukuu.org.uk Wed Feb 20 14:27:12 2008 From: Alan Cox Date: Wed, 20 Feb 2008 20:47:56 +0000 Subject: USB: usb-serial: Prepare for BKL push down To: akpm@osdl.org, linux-kernel@vger.kernel.org, greg@kroah.com Message-ID: <20080220204756.1aa67aee@core> 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 Signed-off-by: Greg Kroah-Hartman --- drivers/usb/serial/usb-serial.c | 11 +++++++++-- 1 file changed, 9 insertions(+), 2 deletions(-) --- a/drivers/usb/serial/usb-serial.c +++ b/drivers/usb/serial/usb-serial.c @@ -401,11 +401,13 @@ static int serial_ioctl (struct tty_stru 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_stru 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_str { 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)