4.7-stable review patch.  If anyone has any objections, please let me know.


From: Xander Huff <xander.h...@ni.com>

[ Upstream commit c3e70edd7c2eed6acd234627a6007627f5c76e8e ]

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.h...@ni.com>
Signed-off-by: Nathan Sullivan <nathan.sulli...@ni.com>
Signed-off-by: David S. Miller <da...@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
 drivers/net/phy/phy.c |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

--- 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;

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