netdev - Re: spidernet: add improved phy support in sungem

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Message-Id: <200702011155.48664.jens@de.ibm.com>
Date:	Thu, 1 Feb 2007 11:55:48 +0100
From:	Jens Osterkamp <jens@...ibm.com>
To:	Linas Vepstas <linas@...tin.ibm.com>
Cc:	Francois Romieu <romieu@...zoreil.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Ishizaki Kou <kou.ishizaki@...hiba.co.jp>,
	linuxppc-dev@...abs.org, netdev@...r.kernel.org,
	cbe-oss-dev@...abs.org, jgarzik@...ox.com,
	James K Lewis <jim@...ewis.com>
Subject: Re: spidernet: add improved phy support in sungem_phy.c

On Tuesday 30 January 2007 11:30 pm, Linas Vepstas wrote:

> Shifting to the right by 5 bits has no effect on the result
> of this conditional. Either the bit is set, or its not.
> There is no need to shift.
> 
> > +	if ( (phy_reg & 0x0020) >> 7 ) {

You are right, I corrected this.

> The result here will always be zero, since the bit,
> if set, will be shifted off the end. Bits on the lef
> are padded with zero.  Ergo, this is a bug.

You are right, wrong bit. I corrected this.

Jens
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