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authorStefani Seibold <stefani@seibold.net>2010-01-05 14:30:31 +0100
committerGreg Kroah-Hartman <gregkh@suse.de>2010-01-20 15:24:33 -0800
commit25719e6b4631959c9ecb1db6967537a124c4a7fa (patch)
tree3f7b5e2ad2f11b48d3c28b6ed8bea1bf5244ae2f
parent24bc7347da73a9ed3383056c3d0f28c0e361621e (diff)
downloadlinux-stericsson-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.c8
1 files 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;