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authorOliver Neukum <oliver@neukum.org>2009-10-07 09:30:49 +0200
committerGreg Kroah-Hartman <gregkh@suse.de>2009-10-09 13:52:08 -0700
commitb2a5cf1bdc011f5474c72543f9d8116c0f07f452 (patch)
tree2e96220f14121811132d3cded43127ed52a13c8a /drivers/usb
parent88fa6590b30ef8c4d41923449ada104f915d8df8 (diff)
USB: serial: fix race between unthrottle and completion handler in symbolserial
usb:usbserial:symbolserial: fix race between unthrottle and completion handler symbol_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')
-rw-r--r--drivers/usb/serial/symbolserial.c12
1 files changed, 8 insertions, 4 deletions
diff --git a/drivers/usb/serial/symbolserial.c b/drivers/usb/serial/symbolserial.c
index cb7e95f9fcbf..f25e54526843 100644
--- a/drivers/usb/serial/symbolserial.c
+++ b/drivers/usb/serial/symbolserial.c
@@ -179,20 +179,24 @@ static void symbol_unthrottle(struct tty_struct *tty)
struct symbol_private *priv = usb_get_serial_data(port->serial);
unsigned long flags;
int result;
+ bool 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->int_urb->dev = port->serial->dev;
- result = usb_submit_urb(priv->int_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->int_urb, GFP_ATOMIC);
+ if (result)
+ dev_err(&port->dev,
+ "%s - failed submitting read urb, error %d\n",
__func__, result);
+ }
}
static int symbol_startup(struct usb_serial *serial)