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

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Date:	Fri, 27 Apr 2007 20:17:10 -0400
From:	Jeff Garzik <jeff@...zik.org>
To:	Dan Williams <dcbw@...hat.com>
CC:	Petko Manolov <petkan@...leusys.com>, Greg KH <greg@...ah.com>,
	netdev@...r.kernel.org
Subject: Re: [PATCH] usb-net/pegasus: simplify carrier detection

Dan Williams wrote:
> Simplify pegasus carrier detection; rely only on the periodic MII
> polling.  Reverts pieces of c43c49bd61fdb9bb085ddafcaadb17d06f95ec43.
> 
> Signed-off-by: Dan Williams <dcbw@...hat.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];

applied


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