Revert "phy: IRQ cannot be shared"

This reverts:
  commit 33c133cc7598 ("phy: IRQ cannot be shared")

On hardware with multiple PHY devices hooked up to the same IRQ line, allow
them to share it.

Sergei Shtylyov says:
  "I'm not sure now what was the reason I concluded that the IRQ sharing
  was impossible... most probably I thought that the kernel IRQ handling
  code exited the loop over the IRQ actions once IRQ_HANDLED was returned
  -- which is obviously not so in reality..."

Signed-off-by: Xander Huff <xander.huff@ni.com>
Signed-off-by: Nathan Sullivan <nathan.sullivan@ni.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 4 insertions, 2 deletions

diff --git a/drivers/net/phy/phy.c b/drivers/net/phy/phy.c
index c5dc2c363f96..c6f66832a1a6 100644
--- a/drivers/net/phy/phy.c
+++ b/drivers/net/phy/phy.c
@@ -722,8 +722,10 @@ phy_err:
 int phy_start_interrupts(struct phy_device *phydev)
 {
         atomic_set(&phydev->irq_disable, 0);
-        if (request_irq(phydev->irq, phy_interrupt, 0, "phy_interrupt",
-                        phydev) < 0) {
+        if (request_irq(phydev->irq, phy_interrupt,
+                                IRQF_SHARED,
+                                "phy_interrupt",
+                                phydev) < 0) {
                 pr_warn("%s: Can't get IRQ %d (PHY)\n",
                         phydev->mdio.bus->name, phydev->irq);
                 phydev->irq = PHY_POLL;