ixgbe: fix bug with shared interrupts

fix ixgbe bug reported with shared legacy interrupts

Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>

1 files changed, 6 insertions, 1 deletions

diff --git a/drivers/net/ixgbe/ixgbe_main.c b/drivers/net/ixgbe/ixgbe_main.c
index 11bf86b93622..cfaa3ca28f51 100644
--- a/drivers/net/ixgbe/ixgbe_main.c
+++ b/drivers/net/ixgbe/ixgbe_main.c
@@ -1245,8 +1245,13 @@ static irqreturn_t ixgbe_intr(int irq, void *data)
         /* for NAPI, using EIAM to auto-mask tx/rx interrupt bits on read
          * therefore no explict interrupt disable is necessary */
         eicr = IXGBE_READ_REG(hw, IXGBE_EICR);
-        if (!eicr)
+        if (!eicr) {
+                /* shared interrupt alert!
+                 * make sure interrupts are enabled because the read will
+                 * have disabled interrupts due to EIAM */
+                ixgbe_irq_enable(adapter);
                 return IRQ_NONE;        /* Not our interrupt */
+        }
 
         if (eicr & IXGBE_EICR_LSC)
                 ixgbe_check_lsc(adapter);