[net-next PATCH 2/3] igb: only disable/enable interrupt bits for igb physical function

[Jeff Kirsher <jeffrey.t.kirsher@intel.com>]

From: Alexander Duyck <alexander.h.duyck@intel.com>

The igb_irq_disable/enable calls were causing virtual functions associated
with the igb physical function to have their interrupts disabled.  In order
to prevent this from occuring we should only clear/set the bits related to
the physical function.

Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
---

 drivers/net/igb/igb_main.c |   14 +++++++++-----
 1 files changed, 9 insertions(+), 5 deletions(-)

diff --git a/drivers/net/igb/igb_main.c b/drivers/net/igb/igb_main.c
index 95089a8..1d03fcb 100644
--- a/drivers/net/igb/igb_main.c
+++ b/drivers/net/igb/igb_main.c
@@ -821,9 +821,11 @@ static void igb_irq_disable(struct igb_adapter *adapter)
 	struct e1000_hw *hw = &adapter->hw;
 
 	if (adapter->msix_entries) {
-		wr32(E1000_EIAM, 0);
-		wr32(E1000_EIMC, ~0);
-		wr32(E1000_EIAC, 0);
+		u32 regval = rd32(E1000_EIAM);
+		wr32(E1000_EIAM, regval & ~adapter->eims_enable_mask);
+		wr32(E1000_EIMC, adapter->eims_enable_mask);
+		regval = rd32(E1000_EIAC);
+		wr32(E1000_EIAC, regval & ~adapter->eims_enable_mask);
 	}
 
 	wr32(E1000_IAM, 0);
@@ -841,8 +843,10 @@ static void igb_irq_enable(struct igb_adapter *adapter)
 	struct e1000_hw *hw = &adapter->hw;
 
 	if (adapter->msix_entries) {
-		wr32(E1000_EIAC, adapter->eims_enable_mask);
-		wr32(E1000_EIAM, adapter->eims_enable_mask);
+		u32 regval = rd32(E1000_EIAC);
+		wr32(E1000_EIAC, regval | adapter->eims_enable_mask);
+		regval = rd32(E1000_EIAM);
+		wr32(E1000_EIAM, regval | adapter->eims_enable_mask);
 		wr32(E1000_EIMS, adapter->eims_enable_mask);
 		if (adapter->vfs_allocated_count)
 			wr32(E1000_MBVFIMR, 0xFF);