netdev - Re: [PATCH] 8139cp: set ring address after enabling C+ mode

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Message-ID: <20121122213950.GA8873@electric-eye.fr.zoreil.com>
Date:	Thu, 22 Nov 2012 22:39:50 +0100
From:	Francois Romieu <romieu@...zoreil.com>
To:	Jeff Garzik <jgarzik@...ox.com>
Cc:	David Miller <davem@...emloft.net>, dwmw2@...radead.org,
	jasowang@...hat.com, netdev@...r.kernel.org, slacky@...apnet.it,
	rggjan@...il.com, gilboad@...il.com,
	Hayes Wang <hayeswang@...ltek.com>
Subject: Re: [PATCH] 8139cp: set ring address after enabling C+ mode

Jeff Garzik <jgarzik@...ox.com> :
> On 11/21/2012 11:39 PM, David Miller wrote:
> >From: Jeff Garzik <jgarzik@...ox.com>
> >Date: Wed, 21 Nov 2012 22:47:39 -0500
> >
> >>State A:  pre-b01af457, known working
> >>State B:  b01af457, known broken
> >
> >State A is also known buggy on the largest consumer of this driver,
> >the emulated hardware.
>
> >Please evaluate this realistically.
> 
> If the simulator fails to match the hardware, that is a simulator bug.

Yes.

> It is disappointing to work around someone else's software bug in
> the kernel.

Yes. :o/

I like David Woodhouse's C (attached patch) since 1) Realtek does
not seem to care about oldies 2) the emulation will not be fixed in a
decent timeframe 3) real 8139cp users care.

It would be nice if gilboad could give it a try (users Cced).

Btw David W., could consider adding artificial delays between the writes
and see if / when things start to fail (CpCmd write in cp_start_hw is an
unflushed posted write for instance).

-- 
Ueimor

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