From: Bjørn Mork <bjorn@mork.no>
Date: Mon, 21 Jan 2013 05:50:39 +0000 (+0000)
Subject: net: cdc_mbim: send ZLP after max sized NTBs
X-Git-Tag: v3.8-rc6~20^2~29^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=328d7b8a4ab045484e1cc09579abf13c8c6223e3;p=pandora-kernel.git

net: cdc_mbim: send ZLP after max sized NTBs

We normally avoid sending ZLPs by padding NTBs with a zero byte
if the NTB is shorter than dwNtbOutMaxSize, resulting in a short
USB packet instead of a ZLP.  But in the case where the NTB length
is exactly dwNtbOutMaxSize and this is an exact multiplum of
wMaxPacketSize, then we must send a ZLP.

This fixes an issue seen on a Sierra Wireless MC7710 device
where the transmission would fail whenever we ended up padding
the NTBs to max size.

Signed-off-by: Bjørn Mork <bjorn@mork.no>
Signed-off-by: David S. Miller <davem@davemloft.net>
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