net: phy: Avoid deadlock during phy_error()
authorFlorian Fainelli <f.fainelli@gmail.com>
Fri, 20 Jan 2017 23:31:52 +0000 (15:31 -0800)
committerDavid S. Miller <davem@davemloft.net>
Mon, 23 Jan 2017 20:37:10 +0000 (15:37 -0500)
commiteab127717a6af54401ba534790c793ec143cd1fc
tree844269bbc845f289d134965033ff37e0243c0811
parent9f427a0e474a67b454420c131709600d44850486
net: phy: Avoid deadlock during phy_error()

phy_error() is called in the PHY state machine workqueue context, and
calls phy_trigger_machine() which does a cancel_delayed_work_sync() of
the workqueue we execute from, causing a deadlock situation.

Augment phy_trigger_machine() machine with a sync boolean indicating
whether we should use cancel_*_sync() or just cancel_*_work().

Fixes: 3c293f4e08b5 ("net: phy: Trigger state machine on state change and not polling.")
Reported-by: Russell King <rmk+kernel@armlinux.org.uk>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
drivers/net/phy/phy.c