Commit 9c2c2e62 authored by Andrew Lunn's avatar Andrew Lunn Committed by David S. Miller
Browse files

net: phy: Restore phy_resume() locking assumption 



commit f5e64032 ("net: phy: fix resume handling") changes the
locking semantics for phy_resume() such that the caller now needs to
hold the phy mutex. Not all call sites were adopted to this new
semantic, resulting in warnings from the added
WARN_ON(!mutex_is_locked(&phydev->lock)).  Rather than change the
semantics, add a __phy_resume() and restore the old behavior of
phy_resume().

Reported-by: default avatarHeiner Kallweit <hkallweit1@gmail.com>
Fixes: f5e64032 ("net: phy: fix resume handling")
Signed-off-by: default avatarAndrew Lunn <andrew@lunn.ch>
Reviewed-by: default avatarFlorian Fainelli <f.fainelli@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 1b22bcad

drivers/net/phy/phy.c

+1 −1
Original line number Diff line number Diff line
@@ -819,7 +819,7 @@ void phy_start(struct phy_device *phydev) 
		break;

	case PHY_HALTED:

		/* if phy was suspended, bring the physical link up again */

		phy_resume(phydev);

		__phy_resume(phydev);



		/* make sure interrupts are re-enabled for the PHY */

		if (phy_interrupt_is_valid(phydev)) {

drivers/net/phy/phy_device.c

+13 −5
Original line number Diff line number Diff line
@@ -135,9 +135,7 @@ static int mdio_bus_phy_resume(struct device *dev) 
	if (!mdio_bus_phy_may_suspend(phydev))

		goto no_resume;



	mutex_lock(&phydev->lock);

	ret = phy_resume(phydev);

	mutex_unlock(&phydev->lock);

	if (ret < 0)

		return ret;
@@ -1041,9 +1039,7 @@ int phy_attach_direct(struct net_device *dev, struct phy_device *phydev, 
	if (err)

		goto error;



	mutex_lock(&phydev->lock);

	phy_resume(phydev);

	mutex_unlock(&phydev->lock);

	phy_led_triggers_register(phydev);



	return err;
@@ -1172,7 +1168,7 @@ int phy_suspend(struct phy_device *phydev) 
}

EXPORT_SYMBOL(phy_suspend);



int phy_resume(struct phy_device *phydev)

int __phy_resume(struct phy_device *phydev)

{

	struct phy_driver *phydrv = to_phy_driver(phydev->mdio.dev.driver);

	int ret = 0;
@@ -1189,6 +1185,18 @@ int phy_resume(struct phy_device *phydev) 


	return ret;

}

EXPORT_SYMBOL(__phy_resume);



int phy_resume(struct phy_device *phydev)

{

	int ret;



	mutex_lock(&phydev->lock);

	ret = __phy_resume(phydev);

	mutex_unlock(&phydev->lock);



	return ret;

}

EXPORT_SYMBOL(phy_resume);



int phy_loopback(struct phy_device *phydev, bool enable)

include/linux/phy.h

+1 −0
Original line number Diff line number Diff line
@@ -924,6 +924,7 @@ void phy_device_remove(struct phy_device *phydev); 
int phy_init_hw(struct phy_device *phydev);

int phy_suspend(struct phy_device *phydev);

int phy_resume(struct phy_device *phydev);

int __phy_resume(struct phy_device *phydev);

int phy_loopback(struct phy_device *phydev, bool enable);

struct phy_device *phy_attach(struct net_device *dev, const char *bus_id,

			      phy_interface_t interface);

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