rt2x00: Fix sparse warning on nested container_of()

Sparse produces warnings about nested contain_of() statements,
this means that lines like:
	interface_to_usbdev(to_usb_interface(rt2x00dev->dev));
will upset sparse.
Add a new macro to rt2x00usb.h which will convert to device
structure to the usb_device pointer in 2 steps to prevent this
sparse warning.

Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 3 insertions, 6 deletions

diff --git a/drivers/net/wireless/rt2x00/rt2x00usb.c b/drivers/net/wireless/rt2x00/rt2x00usb.c
index b94c461fbaf9..5593b9a83108 100644
--- a/drivers/net/wireless/rt2x00/rt2x00usb.c
+++ b/drivers/net/wireless/rt2x00/rt2x00usb.c
@@ -40,8 +40,7 @@ int rt2x00usb_vendor_request(struct rt2x00_dev *rt2x00dev,
                              void *buffer, const u16 buffer_length,
                              const int timeout)
 {
-        struct usb_device *usb_dev =
-                interface_to_usbdev(to_usb_interface(rt2x00dev->dev));
+        struct usb_device *usb_dev = to_usb_device_intf(rt2x00dev->dev);
         int status;
         unsigned int i;
         unsigned int pipe =
@@ -162,8 +161,7 @@ static void rt2x00usb_interrupt_txdone(struct urb *urb)
 int rt2x00usb_write_tx_data(struct queue_entry *entry)
 {
         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
-        struct usb_device *usb_dev =
-                interface_to_usbdev(to_usb_interface(rt2x00dev->dev));
+        struct usb_device *usb_dev = to_usb_device_intf(rt2x00dev->dev);
         struct queue_entry_priv_usb *entry_priv = entry->priv_data;
         struct skb_frame_desc *skbdesc;
         u32 length;
@@ -319,8 +317,7 @@ EXPORT_SYMBOL_GPL(rt2x00usb_disable_radio);
 void rt2x00usb_init_rxentry(struct rt2x00_dev *rt2x00dev,
                             struct queue_entry *entry)
 {
-        struct usb_device *usb_dev =
-                interface_to_usbdev(to_usb_interface(rt2x00dev->dev));
+        struct usb_device *usb_dev = to_usb_device_intf(rt2x00dev->dev);
         struct queue_entry_priv_usb *entry_priv = entry->priv_data;
 
         usb_fill_bulk_urb(entry_priv->urb, usb_dev,