From: Richard Röjfors <richard.rojfors@endian.se>
Date: Sun, 16 Nov 2008 03:53:24 +0000 (-0800)
Subject: USB: gadget rndis: send notifications
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=ff3495052af48f7a2bf7961b131dc9e161dae19c;p=linux-beck.git

USB: gadget rndis: send notifications

It turns out that atomic_inc_return() returns the *new* value
not the original one, so the logic in rndis_response_available()
kept the first RNDIS response notification from getting out.
This prevented interoperation with MS-Windows (but not Linux).

Fix this to make RNDIS behave again.

Signed-off-by: Richard Röjfors <richard.rojfors@endian.se>
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Cc: stable <stable@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

diff --git a/drivers/usb/gadget/f_rndis.c b/drivers/usb/gadget/f_rndis.c
index 8afb14a4a72f..428b5993575a 100644
--- a/drivers/usb/gadget/f_rndis.c
+++ b/drivers/usb/gadget/f_rndis.c
@@ -302,7 +302,7 @@ static void rndis_response_available(void *_rndis)
 	__le32				*data = req->buf;
 	int				status;
 
-	if (atomic_inc_return(&rndis->notify_count))
+	if (atomic_inc_return(&rndis->notify_count) != 1)
 		return;
 
 	/* Send RNDIS RESPONSE_AVAILABLE notification; a