From 25719e6b4631959c9ecb1db6967537a124c4a7fa Mon Sep 17 00:00:00 2001 From: Stefani Seibold Date: Tue, 5 Jan 2010 14:30:31 +0100 Subject: [PATCH] USB: serial: fix USB serial fix kfifo_len locking This patch fix a possible race bug in drivers/usb/serial/generic with the new kfifo API. Please apply it to the 2.6.33-rc* tree. Signed-off-by: Stefani Seibold Signed-off-by: Greg Kroah-Hartman --- drivers/usb/serial/generic.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/drivers/usb/serial/generic.c b/drivers/usb/serial/generic.c index f1ea3a33b6e6..5ce033ab9b99 100644 --- a/drivers/usb/serial/generic.c +++ b/drivers/usb/serial/generic.c @@ -386,12 +386,12 @@ int usb_serial_generic_chars_in_buffer(struct tty_struct *tty) dbg("%s - port %d", __func__, port->number); - if (serial->type->max_in_flight_urbs) { - spin_lock_irqsave(&port->lock, flags); + spin_lock_irqsave(&port->lock, flags); + if (serial->type->max_in_flight_urbs) chars = port->tx_bytes_flight; - spin_unlock_irqrestore(&port->lock, flags); - } else if (serial->num_bulk_out) + else if (serial->num_bulk_out) chars = kfifo_len(&port->write_fifo); + spin_unlock_irqrestore(&port->lock, flags); dbg("%s - returns %d", __func__, chars); return chars;