linux-kernel - Re: "irq/matrix: Spread interrupts on allocation" breaks nouveau in mainline kernel

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Message-ID: <1516904984.5161.2.camel@redhat.com>
Date:   Thu, 25 Jan 2018 13:29:44 -0500
From:   Lyude Paul <lyude@...hat.com>
To:     Mike Galbraith <efault@....de>,
        "Ghannam, Yazen" <Yazen.Ghannam@....com>,
        Thomas Gleixner <tglx@...utronix.de>
Cc:     "hpa@...or.com" <hpa@...or.com>,
        "keith.busch@...el.com" <keith.busch@...el.com>,
        "mingo@...nel.org" <mingo@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Borislav Petkov <bp@...en8.de>
Subject: Re: "irq/matrix: Spread interrupts on allocation" breaks nouveau in
 mainline kernel

Will cc you with some patches in a bit, think I have this problem figured out :)

On Thu, 2018-01-25 at 04:29 +0100, Mike Galbraith wrote:
> On Wed, 2018-01-24 at 15:02 -0500, Lyude Paul wrote:
> > Almost forgot to mention: I came across this patch because reverting it
> > locally on the mainline kernel makes request_irq() behave normally (it
> > doesn't
> > attempt to allocate the same vector twice anymore) and nouveau starts doing
> > suspend/resume correctly again
> 
> Ah, someone already hunted down my resume woes.  Yup, reverting
> $subject fixed up my sole reason to use nouveau (to be able to _resume_
> as well as suspend:).  If anyone needs a lab rat, just holler.
> 
> 	-Mike