[PATCH] USB: simplify spinlocks in send path for speedtouch

irqsave spinlocks in an interrupt handler are superfluous.
Simple spinlocks are sufficient and quicker. As this is in
interrupt context, every cycle counts.

drivers/usb/misc/speedtouch.c

@@ -582,7 +582,6 @@ static void udsl_usb_send_data_complete (struct urb *urb, struct pt_regs *regs)
 	struct udsl_usb_send_data_context *ctx = (struct udsl_usb_send_data_context *) urb->context;
 	struct udsl_instance_data *instance = ctx->instance;
 	int err;
-	unsigned long flags;
 
 	PDEBUG ("udsl_usb_send_data_completion (vcc = %p, skb = %p, status %d)\n", ctx->vcc,
 		ctx->skb, urb->status);
@@ -590,15 +589,15 @@ static void udsl_usb_send_data_complete (struct urb *urb, struct pt_regs *regs)
 	ctx->vcc->pop (ctx->vcc, ctx->skb);
 	ctx->skb = NULL;
 
-	spin_lock_irqsave (&instance->sndqlock, flags);
+	spin_lock (&instance->sndqlock);
 	if (skb_queue_empty (&instance->sndqueue)) {
-		spin_unlock_irqrestore (&instance->sndqlock, flags);
+		spin_unlock (&instance->sndqlock);
 		return;
 	}
 	/* submit next skb */
 	ctx->skb = skb_dequeue (&(instance->sndqueue));
 	ctx->vcc = ((struct udsl_cb *) (ctx->skb->cb))->vcc;
-	spin_unlock_irqrestore (&instance->sndqlock, flags);
+	spin_unlock (&instance->sndqlock);
 	usb_fill_bulk_urb (urb,
 		       instance->usb_dev,
 		       usb_sndbulkpipe (instance->usb_dev, UDSL_ENDPOINT_DATA_OUT),