netdev - RE: [PATCH] net: fec: fix the error to get the previous BD entry

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Date:	Thu, 22 Aug 2013 14:14:38 +0000
From:	Li Frank-B20596 <B20596@...escale.com>
To:	Duan Fugang-B38611 <B38611@...escale.com>,
	Zhou Luwei-B45643 <B45643@...escale.com>,
	"davem@...emloft.net" <davem@...emloft.net>
CC:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"shawn.guo@...aro.org" <shawn.guo@...aro.org>,
	"bhutchings@...arflare.com" <bhutchings@...arflare.com>,
	Estevam Fabio-R49496 <r49496@...escale.com>,
	"stephen@...workplumber.org" <stephen@...workplumber.org>
Subject: RE: [PATCH] net: fec: fix the error to get the previous BD entry

> 
> -	bdp_pre = fec_enet_get_prevdesc(bdp, fep->bufdesc_ex);
> +	if (bdp == fep->tx_bd_base)
> +		bdp_pre = bdp + TX_RING_SIZE - 1;

You need consider both extended BD format and legacy format. 
The size of BD is difference, you can NOT directly you bdp+TX_RING_SIZE -1

Best regards
Frank Li

> +	else
> +		bdp_pre = fec_enet_get_prevdesc(bdp, fep->bufdesc_ex);
>  	if ((id_entry->driver_data & FEC_QUIRK_ERR006358) &&
>  	    !(bdp_pre->cbd_sc & BD_ENET_TX_READY)) {
>  		fep->delay_work.trig_tx = true;
> --
> 1.7.1


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