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-Tag: v2.6.27.8~102
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=2ab3bef821648fb04dec72b240da8f572ec597db;p=karo-tx-linux.git

USB: gadget rndis: send notifications

commit ff3495052af48f7a2bf7961b131dc9e161dae19c upstream.

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>
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 659b3d9671c4..00dfbbeb28c2 100644
--- a/drivers/usb/gadget/f_rndis.c
+++ b/drivers/usb/gadget/f_rndis.c
@@ -303,7 +303,7 @@ 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