From: Tommy Christensen <tommy.christensen@tpack.net>
Date: Mon, 7 Nov 2005 08:58:04 +0000 (-0800)
Subject: [PATCH] 3c59x: avoid blindly reading link status twice
X-Git-Tag: v2.6.15-rc1~700
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d9e46de34e4212f472684b1561ba323aac54ea25;p=linux-2.6

[PATCH] 3c59x: avoid blindly reading link status twice

In order to spare some I/O operations, be more intelligent about when to
read from the PHY.

Pointed out by Bogdan Costescu.

Signed-off-by: Tommy S. Christensen <tommy.christensen@tpack.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

diff --git a/drivers/net/3c59x.c b/drivers/net/3c59x.c
index 88ce4c43fd..e1f773d07e 100644
--- a/drivers/net/3c59x.c
+++ b/drivers/net/3c59x.c
@@ -1893,7 +1893,10 @@ vortex_timer(unsigned long data)
 		{
 			spin_lock_bh(&vp->lock);
 			mii_status = mdio_read(dev, vp->phys[0], MII_BMSR);
-			mii_status = mdio_read(dev, vp->phys[0], MII_BMSR);
+			if (!(mii_status & BMSR_LSTATUS)) {
+				/* Re-read to get actual link status */
+				mii_status = mdio_read(dev, vp->phys[0], MII_BMSR);
+			}
 			ok = 1;
 			if (vortex_debug > 2)
 				printk(KERN_DEBUG "%s: MII transceiver has status %4.4x.\n",