NFC: nfcmrvl_usb: use irqsave() in USB's complete callback

The USB completion callback does not disable interrupts while acquiring
the lock. We want to remove the local_irq_disable() invocation from
__usb_hcd_giveback_urb() and therefore it is required for the callback
handler to disable the interrupts while acquiring the lock.
The callback may be invoked either in IRQ or BH context depending on the
USB host controller.
Use the _irqsave() variant of the locking primitives.

Cc: Samuel Ortiz <sameo@linux.intel.com>
Cc: linux-wireless@vger.kernel.org
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/nfc/nfcmrvl/usb.c

@@ -160,13 +160,14 @@ static void nfcmrvl_tx_complete(struct urb *urb)
 	struct nci_dev *ndev = (struct nci_dev *)skb->dev;
 	struct nfcmrvl_private *priv = nci_get_drvdata(ndev);
 	struct nfcmrvl_usb_drv_data *drv_data = priv->drv_data;
+	unsigned long flags;
 
 	nfc_info(priv->dev, "urb %p status %d count %d\n",
 		 urb, urb->status, urb->actual_length);
 
-	spin_lock(&drv_data->txlock);
+	spin_lock_irqsave(&drv_data->txlock, flags);
 	drv_data->tx_in_flight--;
-	spin_unlock(&drv_data->txlock);
+	spin_unlock_irqrestore(&drv_data->txlock, flags);
 
 	kfree(urb->setup_packet);
 	kfree_skb(skb);