linux-kernel - Re: [PATCH 2/4] ALSA: hda: Stop mangling PCI MSI

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Date:   Fri, 23 Oct 2020 14:59:08 +0200
From:   Takashi Iwai <tiwai@...e.de>
To:     Kai-Heng Feng <kai.heng.feng@...onical.com>
Cc:     tiwai@...e.com, Jaroslav Kysela <perex@...ex.cz>,
        Kai Vehmanen <kai.vehmanen@...ux.intel.com>,
        Alex Deucher <alexander.deucher@....com>,
        Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
        "moderated list:SOUND" <alsa-devel@...a-project.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/4] ALSA: hda: Stop mangling PCI MSI

On Fri, 23 Oct 2020 14:53:08 +0200,
Kai-Heng Feng wrote:
> 
> 
> 
> > On Oct 23, 2020, at 19:34, Takashi Iwai <tiwai@...e.de> wrote:
> > 
> > On Fri, 23 Oct 2020 12:23:36 +0200,
> > Kai-Heng Feng wrote:
> >> 
> >> @@ -1038,14 +1036,6 @@ static int azx_suspend(struct device *dev)
> >> 		__azx_runtime_suspend(chip);
> >> 	else
> >> 		pm_runtime_force_suspend(dev);
> >> -	if (bus->irq >= 0) {
> >> -		free_irq(bus->irq, chip);
> >> -		bus->irq = -1;
> >> -		chip->card->sync_irq = -1;
> >> -	}
> > 
> > This release of irq has nothing to do with MSI.  There has been PCI
> > controllers that assign to a different IRQ line after the resume.
> 
> Can this issue happened before commit 41017f0cac925 ("[PATCH] PCI: MSI(X) save/restore for suspend/resume") was merged?

It's not about MSI.  The IRQ number itself may change after the
resume.

But I guess it's hard to prove it; the system was tad old, and I don't
know who own it now.


Takashi