igb: don't read eicr when responding to legacy interrupts

The interrupt handler was reading eicr and then doing nothing with the
result.  I have removed the variable and the register read since they
provide no value to the legacy interrupt handler.

Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/igb/igb_main.c b/drivers/net/igb/igb_main.c
index e3f521c..56c1455 100644 (file)
--- a/drivers/net/igb/igb_main.c
+++ b/drivers/net/igb/igb_main.c
@@ -3519,7 +3519,7 @@ static irqreturn_t igb_intr_msi(int irq, void *data)
 }
 
 /**
- * igb_intr - Interrupt Handler
+ * igb_intr - Legacy Interrupt Handler
  * @irq: interrupt number
  * @data: pointer to a network interface device structure
  **/
@@ -3531,7 +3531,6 @@ static irqreturn_t igb_intr(int irq, void *data)
        /* Interrupt Auto-Mask...upon reading ICR, interrupts are masked.  No
         * need for the IMC write */
        u32 icr = rd32(E1000_ICR);
-       u32 eicr = 0;
        if (!icr)
                return IRQ_NONE;  /* Not our interrupt */
 
@@ -3547,8 +3546,6 @@ static irqreturn_t igb_intr(int irq, void *data)
                adapter->stats.doosync++;
        }
 
-       eicr = rd32(E1000_EICR);
-
        if (icr & (E1000_ICR_RXSEQ | E1000_ICR_LSC)) {
                hw->mac.get_link_status = 1;
                /* guard against interrupt when we're going down */