From: Malcolm Priestley <tvboxspy@gmail.com>
Date: Tue, 21 Apr 2015 21:33:00 +0000 (+0100)
Subject: staging: vt6655: vnt_tx_packet Correct TX order of OWNED_BY_NIC
X-Git-Tag: omap-for-v4.2/wakeirq-drivers~2^2~9^2~4
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d65d2b25d2761153390df8026cca1a528d9b6c5a;p=pandora-kernel.git

staging: vt6655: vnt_tx_packet Correct TX order of OWNED_BY_NIC

The state of m_td0TD0.f1Owner should change after the buff_addr
has been filled otherwise the device grabs the buffer too early.

m_td0TD0.f1Owner is protected by memory barriers on both sides
of change.

iTDUsed is best incremented after MACvTransmit.

It appears that f1Owner actually polls to do the memory transfer.

A back port patch will be needed for v3.19

Signed-off-by: Malcolm Priestley <tvboxspy@gmail.com>
Cc: <stable@vger.kernel.org> # v4.0+
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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