linux-kernel - Re: [PATCH] PCI/shpchp: fix a bus speed issue on hotplug

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Message-ID: <CAErSpo6SOc-OPQDyjweAataRXwjPYgXM3+P1nhK7zQ2vRjRE2g@mail.gmail.com>
Date:	Thu, 1 May 2014 14:00:41 -0600
From:	Bjorn Helgaas <bhelgaas@...gle.com>
To:	marcel.a@...hat.com
Cc:	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Matthew Wilcox <matthew@....cx>,
	"Michael S. Tsirkin" <mst@...hat.com>
Subject: Re: [PATCH] PCI/shpchp: fix a bus speed issue on hotplug

On Thu, May 1, 2014 at 12:57 PM, Marcel Apfelbaum
<marcel.apfelbaum@...il.com> wrote:
> On Thu, 2014-05-01 at 21:13 +0300, Marcel Apfelbaum wrote:
>> On Thu, 2014-05-01 at 12:02 -0600, Bjorn Helgaas wrote:
>> > On Thu, May 1, 2014 at 8:35 AM, Marcel Apfelbaum <marcel.a@...hat.com> wrote:
>> > > When a board is added, the shpchp driver checks if there
>> > > is a mismatch between the bridge's adapter and the bus speed.
>> > > If there is, it sets the subordinate speed (if there is no device on it).
>> > >
>> > > However, it takes the reference of the board speed from the primary bus
>> > > and not from the subordinate. If the primary bus is PCI and not PCIX/PCIe,
>> > > its speed is not updated and remains 0xff. As a result hotplug fails
>> > > with error: "Speed of bus ff and adapter 0 mismatch".
>> >
>> > It'd be cool to have a bugzilla for this with lspci and dmesg output.
>> > I'll also have to check the other hotplug drivers for similar issues,
>> > unless you've already done that.
>> I'll open a BZ with the details, sure.
> Done: https://bugzilla.kernel.org/show_bug.cgi?id=75251
> If you need further details, please let me know.

Thanks.  Would you mind attaching the "lspci -vv" output?  That should
show more details, including the information used to compute the bus
speed.

Also, you checked the "regression" box.  Can you confirm that and
identify a known-working kernel?  If we know which kernels are broken,
we can potentially mark the fix to be backported to them.

Bjorn
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