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net: phy: Fix phy_mac_interrupt()

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commit deccd16f91f930af8e91ffbbfc839d0ad8da999d upstream.

Commit 5ea94e7686 ("phy: add phy_mac_interrupt()") to use with
PHY_IGNORE_INTERRUPT added a cancel_work_sync() into phy_mac_interrupt()
which is allowed to sleep, whereas phy_mac_interrupt() is expected to be
callable from interrupt context.

Now that we have fixed how the PHY state machine treats
PHY_IGNORE_INTERRUPT with respect to state changes, we can just set the
new link state, and queue the PHY state machine for execution so it is
going to read the new link state.

For that to work properly, we need to update phy_change() not to try to
invoke any interrupt callbacks if we have configured the PHY device for
PHY_IGNORE_INTERRUPT, because that PHY device and its driver are not
required to implement those.

Fixes: 5ea94e7686 ("phy: add phy_mac_interrupt() to use with PHY_IGNORE_INTERRUPT")
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Florian Fainelli 2016-01-18 19:33:07 -08:00 • committed by Greg Kroah-Hartman
parent 0d1951fa23
commit b32dff21ab
1 changed files with 18 additions and 13 deletions
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31
drivers/net/phy/phy.c
View file

@ -699,25 +699,29 @@ void phy_change(struct work_struct *work)
struct phy_device *phydev =
container_of(work, struct phy_device, phy_queue);
if (phydev->drv->did_interrupt &&
!phydev->drv->did_interrupt(phydev))
goto ignore;
if (phy_interrupt_is_valid(phydev)) {
if (phydev->drv->did_interrupt &&
!phydev->drv->did_interrupt(phydev))
goto ignore;
if (phy_disable_interrupts(phydev))
goto phy_err;
if (phy_disable_interrupts(phydev))
goto phy_err;
}
mutex_lock(&phydev->lock);
if ((PHY_RUNNING == phydev->state) || (PHY_NOLINK == phydev->state))
phydev->state = PHY_CHANGELINK;
mutex_unlock(&phydev->lock);
atomic_dec(&phydev->irq_disable);
enable_irq(phydev->irq);
if (phy_interrupt_is_valid(phydev)) {
atomic_dec(&phydev->irq_disable);
enable_irq(phydev->irq);
/* Reenable interrupts */
if (PHY_HALTED != phydev->state &&
phy_config_interrupt(phydev, PHY_INTERRUPT_ENABLED))
goto irq_enable_err;
/* Reenable interrupts */
if (PHY_HALTED != phydev->state &&
phy_config_interrupt(phydev, PHY_INTERRUPT_ENABLED))
goto irq_enable_err;
}
/* reschedule state queue work to run as soon as possible */
cancel_delayed_work_sync(&phydev->state_queue);
@ -1026,9 +1030,10 @@ void phy_state_machine(struct work_struct *work)
void phy_mac_interrupt(struct phy_device *phydev, int new_link)
{
cancel_work_sync(&phydev->phy_queue);
phydev->link = new_link;
schedule_work(&phydev->phy_queue);
/* Trigger a state machine change */
queue_work(system_power_efficient_wq, &phydev->phy_queue);
}
EXPORT_SYMBOL(phy_mac_interrupt);