2 files changed, 20 insertions, 0 deletions

diff --git a/include/linux/usb.h b/include/linux/usb.h
index 191af498c4f5..1ea25377ca0d 100644
--- a/include/linux/usb.h
+++ b/include/linux/usb.h
@@ -570,6 +570,16 @@ static inline void usb_mark_last_busy(struct usb_device *udev)
 /* for drivers using iso endpoints */
 extern int usb_get_current_frame_number(struct usb_device *usb_dev);
 
+/* Sets up a group of bulk endpoints to support multiple stream IDs. */
+extern int usb_alloc_streams(struct usb_interface *interface,
+                struct usb_host_endpoint **eps, unsigned int num_eps,
+                unsigned int num_streams, gfp_t mem_flags);
+
+/* Reverts a group of bulk endpoints back to not using stream IDs. */
+extern void usb_free_streams(struct usb_interface *interface,
+                struct usb_host_endpoint **eps, unsigned int num_eps,
+                gfp_t mem_flags);
+
 /* used these for multi-interface device registration */
 extern int usb_driver_claim_interface(struct usb_driver *driver,
                         struct usb_interface *iface, void *priv);
diff --git a/include/linux/usb/hcd.h b/include/linux/usb/hcd.h
index d268415b7a40..aca73a5c3af7 100644
--- a/include/linux/usb/hcd.h
+++ b/include/linux/usb/hcd.h
@@ -250,6 +250,16 @@ struct hc_driver {
         int     (*alloc_dev)(struct usb_hcd *, struct usb_device *);
                 /* Called by usb_disconnect to free HC device structures */
         void    (*free_dev)(struct usb_hcd *, struct usb_device *);
+        /* Change a group of bulk endpoints to support multiple stream IDs */
+        int     (*alloc_streams)(struct usb_hcd *hcd, struct usb_device *udev,
+                struct usb_host_endpoint **eps, unsigned int num_eps,
+                unsigned int num_streams, gfp_t mem_flags);
+        /* Reverts a group of bulk endpoints back to not using stream IDs.
+         * Can fail if we run out of memory.
+         */
+        int     (*free_streams)(struct usb_hcd *hcd, struct usb_device *udev,
+                struct usb_host_endpoint **eps, unsigned int num_eps,
+                gfp_t mem_flags);
 
         /* Bandwidth computation functions */
         /* Note that add_endpoint() can only be called once per endpoint before