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authorOliver Neukum <oliver@neukum.org>2009-10-07 09:25:10 +0200
committerGreg Kroah-Hartman <gregkh@suse.de>2009-10-09 13:52:08 -0700
commit88fa6590b30ef8c4d41923449ada104f915d8df8 (patch)
treec234aed89fa1c94b8115e6a6cb5eb9433357a52c
parentd55500941fe6db4d7424c744522ee2451ac1ceda (diff)
USB: serial: fix race between unthrottle and completion handler in opticon
usb:usbserial:opticon: fix race between unthrottle and completion handler opticon_unthrottle() mustn't resubmit the URB unconditionally as the URB may still be running. Signed-off-by: Oliver Neukum <oliver@neukum.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
-rw-r--r--drivers/usb/serial/opticon.c13
1 files changed, 8 insertions, 5 deletions
diff --git a/drivers/usb/serial/opticon.c b/drivers/usb/serial/opticon.c
index 1085a577c5c..80f59b6350c 100644
--- a/drivers/usb/serial/opticon.c
+++ b/drivers/usb/serial/opticon.c
@@ -314,21 +314,24 @@ static void opticon_unthrottle(struct tty_struct *tty)
struct usb_serial_port *port = tty->driver_data;
struct opticon_private *priv = usb_get_serial_data(port->serial);
unsigned long flags;
- int result;
+ int result, was_throttled;
dbg("%s - port %d", __func__, port->number);
spin_lock_irqsave(&priv->lock, flags);
priv->throttled = false;
+ was_throttled = priv->actually_throttled;
priv->actually_throttled = false;
spin_unlock_irqrestore(&priv->lock, flags);
priv->bulk_read_urb->dev = port->serial->dev;
- result = usb_submit_urb(priv->bulk_read_urb, GFP_ATOMIC);
- if (result)
- dev_err(&port->dev,
- "%s - failed submitting read urb, error %d\n",
+ if (was_throttled) {
+ result = usb_submit_urb(priv->bulk_read_urb, GFP_ATOMIC);
+ if (result)
+ dev_err(&port->dev,
+ "%s - failed submitting read urb, error %d\n",
__func__, result);
+ }
}
static int opticon_tiocmget(struct tty_struct *tty, struct file *file)