[PATCH] usb-net/pegasus: simplify carrier detection

[Dan Williams <dcbw@redhat.com>]

Simplify pegasus carrier detection; rely only on the periodic MII
polling.  Reverts pieces of c43c49bd61fdb9bb085ddafcaadb17d06f95ec43.

Signed-off-by: Dan Williams <dcbw@redhat.com>

--- a/drivers/usb/net/pegasus.h	2007-04-25 21:21:00.000000000 -0400
+++ b/drivers/usb/net/pegasus.h	2007-04-25 21:21:13.000000000 -0400
@@ -11,7 +11,6 @@
 
 #define	PEGASUS_II		0x80000000
 #define	HAS_HOME_PNA		0x40000000
-#define	TRUST_LINK_STATUS	0x20000000
 
 #define	PEGASUS_MTU		1536
 #define	RX_SKBS			4
@@ -204,7 +203,7 @@
 PEGASUS_DEV( "Allied Telesyn Int. AT-USB100", VENDOR_ALLIEDTEL, 0xb100,
 		DEFAULT_GPIO_RESET | PEGASUS_II )
 PEGASUS_DEV( "Belkin F5D5050 USB Ethernet", VENDOR_BELKIN, 0x0121,
-		DEFAULT_GPIO_RESET | PEGASUS_II | TRUST_LINK_STATUS )
+		DEFAULT_GPIO_RESET | PEGASUS_II )
 PEGASUS_DEV( "Billionton USB-100", VENDOR_BILLIONTON, 0x0986,
 		DEFAULT_GPIO_RESET )
 PEGASUS_DEV( "Billionton USBLP-100", VENDOR_BILLIONTON, 0x0987,
--- a/drivers/usb/net/pegasus.c	2007-04-25 21:20:32.000000000 -0400
+++ b/drivers/usb/net/pegasus.c	2007-04-25 21:22:15.000000000 -0400
@@ -848,16 +848,6 @@
 		 * d[0].NO_CARRIER kicks in only with failed TX.
 		 * ... so monitoring with MII may be safest.
 		 */
-		if (pegasus->features & TRUST_LINK_STATUS) {
-			if (d[5] & LINK_STATUS)
-				netif_carrier_on(net);
-			else
-				netif_carrier_off(net);
-		} else {
-			/* Never set carrier _on_ based on ! NO_CARRIER */
-			if (d[0] & NO_CARRIER)
-				netif_carrier_off(net);	
-		}
 
 		/* bytes 3-4 == rx_lostpkt, reg 2E/2F */
 		pegasus->stats.rx_missed_errors += ((d[3] & 0x7f) << 8) | d[4];