diff options
| author | Stefani Seibold <stefani@seibold.net> | 2010-01-05 14:30:31 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-01-20 15:24:33 -0800 |
| commit | 25719e6b4631959c9ecb1db6967537a124c4a7fa (patch) | |
| tree | 3f7b5e2ad2f11b48d3c28b6ed8bea1bf5244ae2f | |
| parent | 24bc7347da73a9ed3383056c3d0f28c0e361621e (diff) | |
| download | history-25719e6b4631959c9ecb1db6967537a124c4a7fa.tar.gz | |
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 <stefani@seibold.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| -rw-r--r-- | drivers/usb/serial/generic.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/drivers/usb/serial/generic.c b/drivers/usb/serial/generic.c index f1ea3a33b6e637..5ce033ab9b99cb 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; |