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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: 3c293f4e08 ("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>
This commit is contained in:
Florian Fainelli 2017-01-20 15:31:52 -08:00 committed by David S. Miller
parent 9f427a0e47
commit eab127717a
1 changed files with 9 additions and 5 deletions
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12
drivers/net/phy/phy.c
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@ -649,14 +649,18 @@ void phy_start_machine(struct phy_device *phydev)
* phy_trigger_machine - trigger the state machine to run
*
* @phydev: the phy_device struct
* @sync: indicate whether we should wait for the workqueue cancelation
*
* Description: There has been a change in state which requires that the
* state machine runs.
*/
static void phy_trigger_machine(struct phy_device *phydev)
static void phy_trigger_machine(struct phy_device *phydev, bool sync)
{
if (sync)
cancel_delayed_work_sync(&phydev->state_queue);
else
cancel_delayed_work(&phydev->state_queue);
queue_delayed_work(system_power_efficient_wq, &phydev->state_queue, 0);
}
@ -693,7 +697,7 @@ static void phy_error(struct phy_device *phydev)
phydev->state = PHY_HALTED;
mutex_unlock(&phydev->lock);
phy_trigger_machine(phydev);
phy_trigger_machine(phydev, false);
}
/**
@ -840,7 +844,7 @@ void phy_change(struct phy_device *phydev)
}
/* reschedule state queue work to run as soon as possible */
phy_trigger_machine(phydev);
phy_trigger_machine(phydev, true);
return;
ignore:
@ -942,7 +946,7 @@ void phy_start(struct phy_device *phydev)
if (do_resume)
phy_resume(phydev);
phy_trigger_machine(phydev);
phy_trigger_machine(phydev, true);
}
EXPORT_SYMBOL(phy_start);