linux-kernel - Re: [PATCH] net-tg3: Initialize REG_BASE

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Message-Id: <20131210.134340.114603867817512238.davem@davemloft.net>
Date:	Tue, 10 Dec 2013 13:43:40 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	mchan@...adcom.com
Cc:	sergei.shtylyov@...entembedded.com, natg@...gle.com,
	nsujir@...adcom.com, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net-tg3: Initialize REG_BASE_ADDR at PCI config offset
 120 to 0

From: Michael Chan <mchan@...adcom.com>
Date: Mon, 9 Dec 2013 22:58:44 -0800

> On Mon, 2013-12-09 at 13:07 -0800, Michael Chan wrote: 
>> On Tue, 2013-12-10 at 00:18 +0300, Sergei Shtylyov wrote: 
>> > >        We had crashes when the PCI config space got scanned via
>> > > /sys/devices/pcixxxx/....../config.
>> > 
>> > > I agree that this fix will not help if the scan happens before the tg3
>> > > driver gets loaded.
>> > 
>> >     Then perhaps a better place for such fixup would be a PCI quirk?
>> > 
>> Yes, I agree.  Thanks.
>> 
> 
> On second thought, I think your original patch should be sufficient and
> we don't need to add the PCI quirk to cover so many devices.  The reason
> is that indirect access needs to be explicitly enabled in the
> MISC_HOST_CTRL (0x68) register.  The default value for register 0x68
> should have indirect access disabled.
> 
> Nat, does this match what you're seeing?  Did you ever see any system
> crash before tg3 loads?

What if the kernel is booted via kexec, and the driver in the kernel
we are kexec'ing from left indirect access enabled in MISC_HOST_CTRL?
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