Re: [net v2] gianfar: Fix Tx flow control deactivation

From: Claudiu Manoil <claudiu.manoil@nxp.com>
Date: Mon, 4 Sep 2017 10:45:28 +0300

The wrong register is checked for the Tx flow control bit,
it should have been maccfg1 not maccfg2.
This went unnoticed for so long probably because the impact is
hardly visible, not to mention the tangled code from adjust_link().
First, link flow control (i.e. handling of Rx/Tx link level pause frames)
is disabled by default (needs to be enabled via 'ethtool -A').
Secondly, maccfg2 always returns 0 for tx_flow_oldval (except for a few
old boards), which results in Tx flow control remaining always on
once activated.

Fixes: 45b679c9a3ccd9e34f28e6ec677b812a860eb8eb ("gianfar: Implement PAUSE frame generation support")

Signed-off-by: Claudiu Manoil <claudiu.manoil@nxp.com>

Please do not put an empty line between Fixes: and other tags.  All tags
are equal and should be in one uninterrupted block of text.

Applied, and queued up for -stable, thanks.