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It seems that there are maximum timings for mdio accesses that can be
hit when the system is under load and the thread is scheduled during
a read or write access. Since there is no way of knowing if this
happens as there is not even a parity bit, try to work around it
by disabling interrupts during any gpio-mdio accesses.
Performance impact seems to be neglectable, as mdio accesses are not
that often.
Hopefully fixes #19500.
Signed-off-by: Jonas Gorski <jogo@openwrt.org>
Backport of r46012.
git-svn-id: svn://svn.openwrt.org/openwrt/branches/chaos_calmer@46016 3c298f89-4303-0410-b956-a3cf2f4a3e73
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