4.4-stable review patch. If anyone has any objections, please let me know.
------------------
From: John Ogness john.ogness@linutronix.de
commit e60870012e5a35b1506d7b376fddfb30e9da0b27 upstream.
The portdata spinlock can be taken in interrupt context (via sierra_outdat_callback()). Disable interrupts when taking the portdata spinlock when discarding deferred URBs during close to prevent a possible deadlock.
Fixes: 014333f77c0b ("USB: sierra: fix urb and memory leak on disconnect") Cc: stable stable@vger.kernel.org Signed-off-by: John Ogness john.ogness@linutronix.de Signed-off-by: Sebastian Andrzej Siewior bigeasy@linutronix.de [ johan: amend commit message and add fixes and stable tags ] Signed-off-by: Johan Hovold johan@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/usb/serial/sierra.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
--- a/drivers/usb/serial/sierra.c +++ b/drivers/usb/serial/sierra.c @@ -790,9 +790,9 @@ static void sierra_close(struct usb_seri kfree(urb->transfer_buffer); usb_free_urb(urb); usb_autopm_put_interface_async(serial->interface); - spin_lock(&portdata->lock); + spin_lock_irq(&portdata->lock); portdata->outstanding_urbs--; - spin_unlock(&portdata->lock); + spin_unlock_irq(&portdata->lock); }
sierra_stop_rx_urbs(port);