USB: g_mass_storage: superfluous and missing packets fixed

The mass storage function responded needlessly to a set
configuration packet.  This was a leftover from converting
gadget (file storage gadget) into a composite function.

Moreover, it has failed to respond to get max LUN request.
Adding request queueing made the function work better.

Signed-off-by: Michal Nazarewicz <m.nazarewicz@samsung.com>
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Cc: Alan Stern <stern@rowland.harvard.edu>
Cc: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 6 insertions, 9 deletions

diff --git a/drivers/usb/gadget/f_mass_storage.c b/drivers/usb/gadget/f_mass_storage.c
index 0a18d446e9dd..3c835503ffb1 100644
--- a/drivers/usb/gadget/f_mass_storage.c
+++ b/drivers/usb/gadget/f_mass_storage.c
@@ -618,7 +618,12 @@ static int fsg_setup(struct usb_function *f,
                         return -EDOM;
                 VDBG(fsg, "get max LUN\n");
                 *(u8 *) req->buf = fsg->common->nluns - 1;
-                return 1;
+
+                /* Respond with data/status */
+                req->length = min(1, w_length);
+                fsg->common->ep0req_name =
+                        ctrl->bRequestType & USB_DIR_IN ? "ep0-in" : "ep0-out";
+                return ep0_queue(fsg->common);
         }
 
         VDBG(fsg,
@@ -2528,14 +2533,6 @@ static void handle_exception(struct fsg_common *common)
 
         case FSG_STATE_CONFIG_CHANGE:
                 rc = do_set_config(common, new_config);
-                if (common->ep0_req_tag != exception_req_tag)
-                        break;
-                if (rc != 0) {                  /* STALL on errors */
-                        DBG(common, "ep0 set halt\n");
-                        usb_ep_set_halt(common->ep0);
-                } else {                        /* Complete the status stage */
-                        ep0_queue(common);
-                }
                 break;
 
         case FSG_STATE_EXIT: