igb: ethtool -d reads EICR which is incorrect as it is read on clear

Ethtool -d is reading the EICR and ICR registers which is currently
clearing these registers and masking off interrupts.  To prevent this we
read the EICS and ICS equivilents as they can be read without clearing or
masking.

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

diff --git a/drivers/net/igb/igb_ethtool.c b/drivers/net/igb/igb_ethtool.c
index 11aee13099513bea5dddd87cb4ff17fa4c135f7b..3eb78a66f8b6dfe33d53a83d6093c74df60a1357 100644 (file)
--- a/drivers/net/igb/igb_ethtool.c
+++ b/drivers/net/igb/igb_ethtool.c
@@ -373,13 +373,17 @@ static void igb_get_regs(struct net_device *netdev,
        regs_buff[12] = rd32(E1000_EECD);
 
        /* Interrupt */
-       regs_buff[13] = rd32(E1000_EICR);
+       /* Reading EICS for EICR because they read the
+        * same but EICS does not clear on read */
+       regs_buff[13] = rd32(E1000_EICS);
        regs_buff[14] = rd32(E1000_EICS);
        regs_buff[15] = rd32(E1000_EIMS);
        regs_buff[16] = rd32(E1000_EIMC);
        regs_buff[17] = rd32(E1000_EIAC);
        regs_buff[18] = rd32(E1000_EIAM);
-       regs_buff[19] = rd32(E1000_ICR);
+       /* Reading ICS for ICR because they read the
+        * same but ICS does not clear on read */
+       regs_buff[19] = rd32(E1000_ICS);
        regs_buff[20] = rd32(E1000_ICS);
        regs_buff[21] = rd32(E1000_IMS);
        regs_buff[22] = rd32(E1000_IMC);