netdev - [PATCH 2/5] igb: ethtool -d reads EICR which is incorrect as it is read on clear

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Message-ID: <20080826112505.15627.9993.stgit@jtkirshe-mobile.jf.intel.com>
Date:	Tue, 26 Aug 2008 04:25:05 -0700
From:	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
To:	jeff@...zik.org
Cc:	netdev@...r.kernel.org, davem@...emloft.net,
	akpm@...ux-foundation.org,
	Alexander Duyck <alexander.h.duyck@...el.com>,
	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Subject: [PATCH 2/5] igb: ethtool -d reads EICR which is incorrect as it is
	read on clear

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

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@...el.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
---

 drivers/net/igb/igb_ethtool.c |    8 ++++++--
 1 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/net/igb/igb_ethtool.c b/drivers/net/igb/igb_ethtool.c
index 6c0a8c2..58906c9 100644
--- 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);

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