[alsa-devel] [PATCH] ASoC: intel: Fix crash at suspend/resume after failed codec registration

[Mark Brown]

On Mon, Mar 25, 2019 at 09:18:04AM -0400, Pierre-Louis Bossart wrote:
> On 3/25/19 8:12 AM, Mark Brown wrote:

> > These are driver specific issues not device model issues as far as I can
> > see?  The issue fixed by this as is that you're storing a pointer in the
> > ASoC level (not device model level) probe that you don't free when the
> > component is unbound, causing you to dereference it later during
> > suspend.  There is absolutely no problem with the machine driver not
> > being guaranteed to bind at the time it's initially registered, that's
> > perfectly normal and should cause no problems.

> Agree, what I was referring is that if the machine probe and card
> registration fails (not just deferred), the parent acpi/pci driver isn't
> notified - there is just no means to provide that information and that leads
> to all kinds of configuration issues.

If there are issues here they could happen via means other than a probe
failing so there's a problem whatever is going on - someone manually
unbinding a device for example.
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