USB: Add a usb_pipe_endpoint() convenience function

Converting a pipe number to a struct usb_host_endpoint pointer is a little
messy.  Introduce a new convenience function to hide the mess.

Signed-off-by: Matthew Wilcox <willy@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 8 insertions, 0 deletions

diff --git a/include/linux/usb.h b/include/linux/usb.h
index 1eb4762d9ea8..fd7d61e58198 100644
--- a/include/linux/usb.h
+++ b/include/linux/usb.h
@@ -1552,6 +1552,14 @@ static inline unsigned int __create_pipe(struct usb_device *dev,
 #define usb_rcvintpipe(dev,endpoint)    \
         ((PIPE_INTERRUPT << 30) | __create_pipe(dev, endpoint) | USB_DIR_IN)
 
+static inline struct usb_host_endpoint *
+usb_pipe_endpoint(struct usb_device *dev, unsigned int pipe)
+{
+        struct usb_host_endpoint **eps;
+        eps = usb_pipein(pipe) ? dev->ep_in : dev->ep_out;
+        return eps[usb_pipeendpoint(pipe)];
+}
+
 /*-------------------------------------------------------------------------*/
 
 static inline __u16