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phylib: Allow early-out in phy_change

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Marvell 88E1121R Dual PHY device can be hardware-configured
to use shared interrupt pin for both PHY ports. For such
PHY configurations using shared PHY interrupt phy_interrupt()
handler will also schedule a work for PHY port which didn't
cause an interrupt.

This patch adds a possibility for PHY drivers to provide
did_interrupt() function which reports if the PHY (or a PHY
port in a multi-PHY device) generated an interrupt. This
function is called in phy_change() as phy_change() shouldn't
proceed if it is invoked for a PHY which didn't cause an
interrupt. So check for interrupt originator in phy_change()
to allow early-out.

Signed-off-by: Anatolij Gustschin <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Anatolij Gustschin 2009-04-07 02:01:42 +00:00 • committed by David S. Miller
commit a8729eb302
2 changed files with 15 additions and 0 deletions
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9
drivers/net/phy/phy.c
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@ -655,6 +655,10 @@ static 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;
err = phy_disable_interrupts(phydev);
if (err)
@ -681,6 +685,11 @@ static void phy_change(struct work_struct *work)
return;
ignore:
atomic_dec(&phydev->irq_disable);
enable_irq(phydev->irq);
return;
irq_enable_err:
disable_irq(phydev->irq);
atomic_inc(&phydev->irq_disable);