netdev - [patch 14/14] e1000: No-delay link detection at interface up

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Message-Id: <1166175754.3365.137.camel@laptopd505.fenrus.org>
Date:	Fri, 15 Dec 2006 10:42:34 +0100
From:	Arjan van de Ven <arjan@...ux.intel.com>
To:	netdev@...r.kernel.org
Subject: [patch 14/14] e1000: No-delay link detection at interface up

Subject: e1000: No-delay link detection at interface up
From: Jesse Brandeburg <jesse.brandeburg@...el.com>

Currently after an interface up, the link state is detected 2 seconds later
when the first watchdog timer runs. This patch changes that by triggering
the hardware to generate a link-change interrupt from the up() function
instead. This has the result that the link state gets detected immediately
and without races. This has the potential to speed up booting since a normal
distribution boot process waits for a link before DHCP is attempted.

Signed-off-by: Jesse Brandeburg <jesse.brandeburg@...el.com>
Signed-off-by: Auke Kok <auke-jan.h.kok@...el.com>
Signed-off-by: Arjan van de Ven <arjan@...ux.intel.com>
---

 drivers/net/e1000/e1000_main.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

Index: linux-2.6/drivers/net/e1000/e1000_main.c
===================================================================
--- linux-2.6.orig/drivers/net/e1000/e1000_main.c
+++ linux-2.6/drivers/net/e1000/e1000_main.c
@@ -543,7 +543,8 @@ e1000_up(struct e1000_adapter *adapter)
 
 	clear_bit(__E1000_DOWN, &adapter->flags);
 
-	mod_timer(&adapter->watchdog_timer, jiffies + 2 * HZ);
+	/* fire a link change interrupt to start the watchdog */
+	E1000_WRITE_REG(&adapter->hw, ICS, E1000_ICS_LSC);
 	return 0;
 }
 

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