staging: comedi: usbduxsigma: tidy up tidy_up()

Rename the function so it has namespace associated with the driver.

For aesthetic reasons, move the function so it's near the one that
allocates the usb buffers.

Tidy up the function so it frees the buffers in the opposite order
they were allocated. Also remove the = NULL for all the buffers,
the driver is being detached so the comedi core will kfree the
private data.
Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/comedi/drivers/usbduxsigma.c

@@ -1514,62 +1514,6 @@ static int usbdux_pwm_config(struct comedi_device *dev,
 	return -EINVAL;
 }
 
-/* end of PWM */
-/*****************************************************************/
-
-static void tidy_up(struct usbduxsigma_private *usbduxsub_tmp)
-{
-	int i;
-
-	/* force unlink all urbs */
-	usbdux_ai_stop(usbduxsub_tmp, 1);
-	usbdux_ao_stop(usbduxsub_tmp, 1);
-	usbdux_pwm_stop(usbduxsub_tmp, 1);
-
-	if (usbduxsub_tmp->urbIn) {
-		for (i = 0; i < usbduxsub_tmp->numOfInBuffers; i++) {
-			kfree(usbduxsub_tmp->urbIn[i]->transfer_buffer);
-			usbduxsub_tmp->urbIn[i]->transfer_buffer = NULL;
-			usb_free_urb(usbduxsub_tmp->urbIn[i]);
-			usbduxsub_tmp->urbIn[i] = NULL;
-		}
-		kfree(usbduxsub_tmp->urbIn);
-		usbduxsub_tmp->urbIn = NULL;
-	}
-	if (usbduxsub_tmp->urbOut) {
-		for (i = 0; i < usbduxsub_tmp->numOfOutBuffers; i++) {
-			if (usbduxsub_tmp->urbOut[i]->transfer_buffer) {
-				kfree(usbduxsub_tmp->
-				      urbOut[i]->transfer_buffer);
-				usbduxsub_tmp->urbOut[i]->transfer_buffer =
-				    NULL;
-			}
-			if (usbduxsub_tmp->urbOut[i]) {
-				usb_free_urb(usbduxsub_tmp->urbOut[i]);
-				usbduxsub_tmp->urbOut[i] = NULL;
-			}
-		}
-		kfree(usbduxsub_tmp->urbOut);
-		usbduxsub_tmp->urbOut = NULL;
-	}
-	if (usbduxsub_tmp->urbPwm) {
-		kfree(usbduxsub_tmp->urbPwm->transfer_buffer);
-		usbduxsub_tmp->urbPwm->transfer_buffer = NULL;
-		usb_free_urb(usbduxsub_tmp->urbPwm);
-		usbduxsub_tmp->urbPwm = NULL;
-	}
-	kfree(usbduxsub_tmp->inBuffer);
-	usbduxsub_tmp->inBuffer = NULL;
-	kfree(usbduxsub_tmp->insnBuffer);
-	usbduxsub_tmp->insnBuffer = NULL;
-	kfree(usbduxsub_tmp->outBuffer);
-	usbduxsub_tmp->outBuffer = NULL;
-	kfree(usbduxsub_tmp->dac_commands);
-	usbduxsub_tmp->dac_commands = NULL;
-	kfree(usbduxsub_tmp->dux_commands);
-	usbduxsub_tmp->dux_commands = NULL;
-}
-
 static int usbduxsigma_getstatusinfo(struct comedi_device *dev, int chan)
 {
 	struct usbduxsigma_private *devpriv = dev->private;
@@ -1793,6 +1737,49 @@ static int usbduxsigma_alloc_usb_buffers(struct comedi_device *dev)
 	return 0;
 }
 
+static void usbduxsigma_free_usb_buffers(struct comedi_device *dev)
+{
+	struct usbduxsigma_private *devpriv = dev->private;
+	struct urb *urb;
+	int i;
+
+	/* force unlink all urbs */
+	usbdux_ai_stop(devpriv, 1);
+	usbdux_ao_stop(devpriv, 1);
+	usbdux_pwm_stop(devpriv, 1);
+
+	urb = devpriv->urbPwm;
+	if (urb) {
+		kfree(urb->transfer_buffer);
+		usb_free_urb(urb);
+	}
+	if (devpriv->urbOut) {
+		for (i = 0; i < devpriv->numOfOutBuffers; i++) {
+			urb = devpriv->urbOut[i];
+			if (urb) {
+				kfree(urb->transfer_buffer);
+				usb_free_urb(urb);
+			}
+		}
+		kfree(devpriv->urbOut);
+	}
+	if (devpriv->urbIn) {
+		for (i = 0; i < devpriv->numOfInBuffers; i++) {
+			urb = devpriv->urbIn[i];
+			if (urb) {
+				kfree(urb->transfer_buffer);
+				usb_free_urb(urb);
+			}
+		}
+		kfree(devpriv->urbIn);
+	}
+	kfree(devpriv->outBuffer);
+	kfree(devpriv->insnBuffer);
+	kfree(devpriv->inBuffer);
+	kfree(devpriv->dux_commands);
+	kfree(devpriv->dac_commands);
+}
+
 static int usbduxsigma_auto_attach(struct comedi_device *dev,
 				   unsigned long context_unused)
 {
@@ -1851,7 +1838,7 @@ static void usbduxsigma_detach(struct comedi_device *dev)
 	usb_set_intfdata(intf, NULL);
 
 	down(&devpriv->sem);
-	tidy_up(devpriv);
+	usbduxsigma_free_usb_buffers(dev);
 	up(&devpriv->sem);
 }