[PATCH 2.6.25] igb: fix legacy mode irq issue

[Andy Gospodarek <andy@greyhouse.net>]

I booted an igb kernel with the option pci=nomsi and instantly noticed
that interrupts no longer worked on my igb device.  I took a look at the
interrupt initialization and quickly discovered a comment stating:

"DO NOT USE EIAME or IAME in legacy mode"

It seemed a bit odd that bits to enable IAM were being set in legacy
interrupt mode, so I dropped out the following parts and interrupts
began working fine again.

Signed-off-by: Andy Gospodarek <andy@greyhouse.net>
---

 igb_main.c |    3 ---
 1 files changed, 3 deletions(-)

diff --git a/drivers/net/igb/igb_main.c b/drivers/net/igb/igb_main.c
index f3c144d..be5da09 100644
--- a/drivers/net/igb/igb_main.c
+++ b/drivers/net/igb/igb_main.c
@@ -472,9 +471,6 @@ static int igb_request_irq(struct igb_adapter *adapter)
 		goto request_done;
 	}
 
-	/* enable IAM, auto-mask */
-	wr32(E1000_IAM, IMS_ENABLE_MASK);
-
 request_done:
 	return err;
 }