1 files changed, 7 insertions, 0 deletions

diff --git a/drivers/usb/gadget/epautoconf.c b/drivers/usb/gadget/epautoconf.c
index 8a832488ccdd..9b7360ff5aa7 100644
--- a/drivers/usb/gadget/epautoconf.c
+++ b/drivers/usb/gadget/epautoconf.c
@@ -128,6 +128,13 @@ ep_matches (
                 }
         }
 
+        /*
+         * If the protocol driver hasn't yet decided on wMaxPacketSize
+         * and wants to know the maximum possible, provide the info.
+         */
+        if (desc->wMaxPacketSize == 0)
+                desc->wMaxPacketSize = cpu_to_le16(ep->maxpacket);
+
         /* endpoint maxpacket size is an input parameter, except for bulk
          * where it's an output parameter representing the full speed limit.
          * the usb spec fixes high speed bulk maxpacket at 512 bytes.