From mboxrd@z Thu Jan 1 00:00:00 1970 From: Stephen Hemminger Subject: Re: [PATCH 1/2] sky2: EEPROM read/write bug fixes Date: Sat, 30 Aug 2008 08:03:42 -0700 Message-ID: <20080830080342.3733190f@extreme> References: <20080827204626.4b65862f@extreme> <20080828111323.GI7908@solarflare.com> <20080828083035.7c6f8f42@extreme> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Cc: Ben Hutchings , Jeff Garzik , netdev@vger.kernel.org To: Stephen Hemminger Return-path: Received: from mail.vyatta.com ([216.93.170.194]:34832 "EHLO mail.vyatta.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751404AbYH3PDo (ORCPT ); Sat, 30 Aug 2008 11:03:44 -0400 In-Reply-To: <20080828083035.7c6f8f42@extreme> Sender: netdev-owner@vger.kernel.org List-ID: On Thu, 28 Aug 2008 08:30:35 -0700 Stephen Hemminger wrote: > On Thu, 28 Aug 2008 12:13:25 +0100 > Ben Hutchings 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! You can show that the pci->vpd code won't work because any access to /sys/class/net/eth0/device/vpd gets ETIMEDOUT.