Re: [PATCH v5 2/9] ALSA: virtio: add virtio sound driver

[Takashi Iwai]

On Thu, 25 Feb 2021 12:51:36 +0100,
Anton Yakovlev wrote:
> 
> > Now I'm wondering whether it's safe to do that from this place.
> > Basically device_reprobe() unbinds the device that releases the full
> > resources once including the devm_* stuff.  And this work itself is in
> > a part of devm allocated resource, so it'll be released there.  That
> > said, we might hit use-after-free...  This needs to be verified.
> 
> It's safe. Suicide kernel workers are funny but possible things. Since
> the kernel itself (AFAIU) assumes such a situation and does not access
> the worker structure after the callback function call.

Indeed, process_one_work() in workqueue.c assures no access to the
work object after the callback.  Then this must be fine.  Good to
know!


thanks,

Takashi