Commit c43c49bd authored by Dan Williams's avatar Dan Williams Committed by Jeff Garzik
Browse files

usb-net/pegasus: fix pegasus carrier detection 



Broken by 4a1728a2 which switched the
return semantics of read_mii_word() but didn't fix usage of
read_mii_word() to conform to the new semantics.

Setting carrier to off based on the NO_CARRIER flag is also incorrect as
that flag only triggers on TX failure and therefore isn't correct when
no frames are being transmitted.  Since there is already a 2*HZ MII
carrier check going on, defer to that.

Add a TRUST_LINK_STATUS feature flag for adapters where the LINK_STATUS
flag is actually correct, and use that rather than the NO_CARRIER flag.

Signed-off-by: default avatarDan Williams <dcbw@redhat.com>
Signed-off-by: default avatarJeff Garzik <jeff@garzik.org>
parent b748d9e3

drivers/usb/net/pegasus.c

+12 −5
Original line number Diff line number Diff line
@@ -316,6 +316,7 @@ static int update_eth_regs_async(pegasus_t * pegasus) 
	return ret;

}



/* Returns 0 on success, error on failure */

static int read_mii_word(pegasus_t * pegasus, __u8 phy, __u8 indx, __u16 * regd)

{

	int i;
@@ -847,10 +848,16 @@ static void intr_callback(struct urb *urb) 
		 * 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);	

		else

			netif_carrier_on(net);

		}



		/* bytes 3-4 == rx_lostpkt, reg 2E/2F */

		pegasus->stats.rx_missed_errors += ((d[3] & 0x7f) << 8) | d[4];
@@ -950,7 +957,7 @@ static void set_carrier(struct net_device *net) 
	pegasus_t *pegasus = netdev_priv(net);

	u16 tmp;



	if (!read_mii_word(pegasus, pegasus->phy, MII_BMSR, &tmp))

	if (read_mii_word(pegasus, pegasus->phy, MII_BMSR, &tmp))

		return;



	if (tmp & BMSR_LSTATUS)

drivers/usb/net/pegasus.h

+2 −1
Original line number Diff line number Diff line
@@ -11,6 +11,7 @@ 


#define	PEGASUS_II		0x80000000

#define	HAS_HOME_PNA		0x40000000

#define	TRUST_LINK_STATUS	0x20000000



#define	PEGASUS_MTU		1536

#define	RX_SKBS			4
@@ -203,7 +204,7 @@ PEGASUS_DEV( "AEI USB Fast Ethernet Adapter", VENDOR_AEILAB, 0x1701, 
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 )

		DEFAULT_GPIO_RESET | PEGASUS_II | TRUST_LINK_STATUS )

PEGASUS_DEV( "Billionton USB-100", VENDOR_BILLIONTON, 0x0986,

		DEFAULT_GPIO_RESET )

PEGASUS_DEV( "Billionton USBLP-100", VENDOR_BILLIONTON, 0x0987,

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