From: Russell King <rmk+kernel@arm.linux.org.uk>
Date: Tue, 25 Aug 2015 08:49:47 +0000 (+0100)
Subject: net: phy: add locking to phy_read_mmd_indirect()/phy_write_mmd_indirect()
X-Git-Tag: omap-for-v4.3/fixes-merge-window~53^2~8
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=05a7f582be961824d62a7f4a817f3783148b5f8a;p=pandora-kernel.git

net: phy: add locking to phy_read_mmd_indirect()/phy_write_mmd_indirect()

The phy layer is missing locking for the above two functions - it
has been observed that two threads (userspace and the phy worker
thread) can race, entering the bus ->write or ->read functions
simultaneously.

This causes the FEC driver to initialise a completion while another
thread is waiting on it or while the interrupt is calling complete()
on it, which causes spinlock unlock-without-lock, spinlock lockups,
and completion timeouts.

Fixes: a59a4d192 ("phy: add the EEE support and the way to access to the MMD registers.")
Fixes: 0c1d77dfb ("net: libphy: Add phy specific function to access mmd phy registers")
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Acked-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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