linux-kernel - Re: [PATCH] PCI: Avoid broken MSI on SB600 USB devices

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Message-ID: <CAHp75VdKOzgWgsTh-8sAEEey8iOLUUgnw=M-OeX+Dzhu2tnH1g@mail.gmail.com>
Date:   Wed, 23 Mar 2022 15:43:29 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     David Woodhouse <dwmw2@...radead.org>
Cc:     Bjorn Helgaas <helgaas@...nel.org>,
        linux-pci <linux-pci@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Mick Lorain <micklorain@...tonmail.com>,
        Alex Williamson <alex.williamson@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Bjorn Helgaas <bhelgaas@...gle.com>
Subject: Re: [PATCH] PCI: Avoid broken MSI on SB600 USB devices

On Wed, Mar 23, 2022 at 2:43 PM David Woodhouse <dwmw2@...radead.org> wrote:
> On Wed, 2022-03-23 at 10:03 +0200, Andy Shevchenko wrote:
> > On Wed, Mar 23, 2022 at 4:26 AM Bjorn Helgaas <helgaas@...nel.org> wrote:
> > > On Mon, Mar 21, 2022 at 01:34:46PM -0500, Bjorn Helgaas wrote:
> > > > From: Bjorn Helgaas <bhelgaas@...gle.com>
> > > > Some ATI SB600 USB adapters advertise MSI, but if INTx is disabled by
> > > > setting PCI_COMMAND_INTX_DISABLE,
> >
> > > > MSI doesn't work either.
> >
> > I think this is not correct.
>
> I think it was perfectly correct until you added a couple of newlines
> in the middle of the sentence, then took it out of context. :)
>
> "If INTX is disabled, MSI doesn't work either".

Ah, I stand corrected. Thanks for the English lesson!

> But really, in that case surely the solution is *not* to disable INTX
> for this device. Then MSI will work, right?

That was my intention, but Bjorn has concerns.

-- 
With Best Regards,
Andy Shevchenko