netdev - Re: [PATCH 1/2] sky2: EEPROM read/write bug fixes

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Date:	Thu, 28 Aug 2008 08:30:35 -0700
From:	Stephen Hemminger <shemminger@...ux-foundation.org>
To:	Ben Hutchings <bhutchings@...arflare.com>
Cc:	Jeff Garzik <jgarzik@...ox.com>, netdev@...r.kernel.org
Subject: Re: [PATCH 1/2] sky2: EEPROM read/write bug fixes

On Thu, 28 Aug 2008 12:13:25 +0100
Ben Hutchings <bhutchings@...arflare.com> wrote:

> Stephen Hemminger wrote:
> > Cleanup and harden the routines accessing the EEPROM.
> >   1. Prevent spin forever waiting for the TWSI bus
> >   2. Fix write eeprom to write full words rather than only 16 bits 
> >     Luckly the vendor doesn't provide EEPROM in Linux format so it must never
> >     have been used.
> >   3. Don't allow partial eeprom writes, not needed, not safe.
> [...]
> 
> You should be able to replace the VPD access code with calls through
> pci_dev->vpd->ops - though you'd need to remove some declarations from
> drivers/pci/pci.h to include/linux/pci.h.
> 
> Ben.
> 

Generically a good idea, but it won't work for this device.
It turns out that the read/write timeouts in pci/access.c are too
short. Since the pci vpd code spins under spin lock with irq's disabled,
it really can't wait for up to 10ms!

Minor note: the pci code seems to be much more verbose with little
gain in real functionality.
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