staging: comedi: change type of auto-config context

Change the type of the context parameter passed to
`comedi_auto_config_helper()` from `void *` to `unsigned long`.  It's
currently just an internal change and all current internal usages pass
pointers in the context, but future uses of this function may pass
integer values or pointer values at the whim of a lower-level comedi
driver and the `unsigned long` type expresses this better as it is
commonly used in the Linux kernel to hold such values.

Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/comedi/drivers.c

@@ -837,7 +837,8 @@ static int
 comedi_auto_config_helper(struct device *hardware_device,
 			  struct comedi_driver *driver,
 			  int (*attach_wrapper) (struct comedi_device *,
-						 void *), void *context)
+						 unsigned long),
+			  unsigned long context)
 {
 	int minor;
 	struct comedi_device_file_info *dev_file_info;
@@ -878,9 +879,10 @@ comedi_auto_config_helper(struct device *hardware_device,
 	return ret;
 }
 
-static int comedi_auto_config_wrapper(struct comedi_device *dev, void *context)
+static int comedi_auto_config_wrapper(struct comedi_device *dev,
+				      unsigned long context)
 {
-	struct comedi_devconfig *it = context;
+	struct comedi_devconfig *it = (struct comedi_devconfig *)context;
 	struct comedi_driver *driv = dev->driver;
 
 	if (driv->num_names) {
@@ -916,7 +918,8 @@ static int comedi_auto_config(struct device *hardware_device,
 	BUG_ON(num_options > COMEDI_NDEVCONFOPTS);
 	memcpy(it.options, options, num_options * sizeof(int));
 	return comedi_auto_config_helper(hardware_device, driver,
-					 comedi_auto_config_wrapper, &it);
+					 comedi_auto_config_wrapper,
+					 (unsigned long)&it);
 }
 
 static void comedi_auto_unconfig(struct device *hardware_device)
@@ -980,16 +983,18 @@ static int comedi_old_pci_auto_config(struct pci_dev *pcidev,
 				  options, ARRAY_SIZE(options));
 }
 
-static int comedi_pci_attach_wrapper(struct comedi_device *dev, void *pcidev)
+static int comedi_pci_attach_wrapper(struct comedi_device *dev,
+				     unsigned long context)
 {
-	return dev->driver->attach_pci(dev, pcidev);
+	return dev->driver->attach_pci(dev, (struct pci_dev *)context);
 }
 
 static int comedi_new_pci_auto_config(struct pci_dev *pcidev,
 				      struct comedi_driver *driver)
 {
 	return comedi_auto_config_helper(&pcidev->dev, driver,
-					 comedi_pci_attach_wrapper, pcidev);
+					 comedi_pci_attach_wrapper,
+					 (unsigned long)pcidev);
 }
 
 int comedi_pci_auto_config(struct pci_dev *pcidev, struct comedi_driver *driver)
@@ -1047,16 +1052,18 @@ static int comedi_old_usb_auto_config(struct usb_interface *intf,
 	return comedi_auto_config(&intf->dev, driver, NULL, 0);
 }
 
-static int comedi_usb_attach_wrapper(struct comedi_device *dev, void *intf)
+static int comedi_usb_attach_wrapper(struct comedi_device *dev,
+				     unsigned long context)
 {
-	return dev->driver->attach_usb(dev, intf);
+	return dev->driver->attach_usb(dev, (struct usb_interface *)context);
 }
 
 static int comedi_new_usb_auto_config(struct usb_interface *intf,
 				      struct comedi_driver *driver)
 {
 	return comedi_auto_config_helper(&intf->dev, driver,
-					 comedi_usb_attach_wrapper, intf);
+					 comedi_usb_attach_wrapper,
+					 (unsigned long)intf);
 }
 
 int comedi_usb_auto_config(struct usb_interface *intf,