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

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Message-ID: <CAGmqidnusPSYt9GHfQVs7SP620jyEN=Aicr1jS3Esb9C5Ov2wA@mail.gmail.com>
Date:	Tue, 10 Dec 2013 07:01:55 -0800
From:	Natarajan Gurumoorthy <natg@...gle.com>
To:	Michael Chan <mchan@...adcom.com>
Cc:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
	nsujir@...adcom.com, netdev@...r.kernel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] net-tg3: Initialize REG_BASE_ADDR at PCI config offset
 120 to 0

Michael,
     The only time I see crashes is after the tg3 driver has been
loaded into the system. I our use case we are poking around
/sys/devices/pcixxxx/......../config.
     I guess you will incorporate the original patch into the driver
and we can abandon this patch.

Regards
Nat


On Mon, Dec 9, 2013 at 10:58 PM, Michael Chan <mchan@...adcom.com> wrote:
> 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?
>



-- 
Regards
Nat Gurumoorthy AB6SJ
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