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authorOliver Neukum <oliver@neukum.org>2009-10-07 13:01:38 +0400
committerGreg Kroah-Hartman <gregkh@suse.de>2009-10-10 00:52:09 +0400
commita1c33952b729eba4cedb8dbe54765921f2b3062f (patch)
treedbdf6757ee483ee07cede1fd340b27b8018a1bb7 /drivers/usb/serial/visor.c
parent638325154572ba2113a18669fe3b299caa2dabd9 (diff)
downloadlinux-a1c33952b729eba4cedb8dbe54765921f2b3062f.tar.xz
USB: serial: fix race between unthrottle and completion handler in visor
usb:usbserial:visor: fix race between unthrottle and completion handler visor_unthrottle() mustn't resubmit the URB unconditionally as the URB may still be running. the same bug as opticon. Signed-off-by: Oliver Neukum <oliver@neukum.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb/serial/visor.c')
-rw-r--r--drivers/usb/serial/visor.c15
1 files changed, 9 insertions, 6 deletions
diff --git a/drivers/usb/serial/visor.c b/drivers/usb/serial/visor.c
index b9341f0e452b..ad1f9232292d 100644
--- a/drivers/usb/serial/visor.c
+++ b/drivers/usb/serial/visor.c
@@ -595,20 +595,23 @@ static void visor_unthrottle(struct tty_struct *tty)
{
struct usb_serial_port *port = tty->driver_data;
struct visor_private *priv = usb_get_serial_port_data(port);
- int result;
+ int result, was_throttled;
dbg("%s - port %d", __func__, port->number);
spin_lock_irq(&priv->lock);
priv->throttled = 0;
+ was_throttled = priv->actually_throttled;
priv->actually_throttled = 0;
spin_unlock_irq(&priv->lock);
- port->read_urb->dev = port->serial->dev;
- result = usb_submit_urb(port->read_urb, GFP_KERNEL);
- if (result)
- dev_err(&port->dev,
- "%s - failed submitting read urb, error %d\n",
+ if (was_throttled) {
+ port->read_urb->dev = port->serial->dev;
+ result = usb_submit_urb(port->read_urb, GFP_KERNEL);
+ if (result)
+ dev_err(&port->dev,
+ "%s - failed submitting read urb, error %d\n",
__func__, result);
+ }
}
static int palm_os_3_probe(struct usb_serial *serial,