Russell King bf7afb29d5
phy: improve safety of fixed-phy MII register reading ...
There is no prevention of a concurrent call to both fixed_mdio_read()
and fixed_phy_update_state(), which can result in the state being
modified while it's being inspected. Fix this by using a seqcount
to detect modifications, and memcpy()ing the state.
We remain slightly naughty here, calling link_update() and updating
the link status within the read-side loop - which would need rework
of the design to change.
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com >
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk >
Signed-off-by: David S. Miller <davem@davemloft.net >
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