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SubjectRe: [alsa-devel] [PATCH 02/14] ALSA: hdac: fix memory release for SST and SOF drivers
On Wed, 5 Jun 2019 10:06:47 -0500
Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com> wrote:

> On 6/5/19 8:45 AM, Amadeusz Sławiński wrote:
> > During the integration of HDaudio support, we changed the way in
> > which we get hdev in snd_hdac_ext_bus_device_init() to use one
> > preallocated with devm_kzalloc(), however it still left kfree(hdev)
> > in snd_hdac_ext_bus_device_exit(). It leads to oopses when trying to
> > rmmod and modprobe. Fix it, by just removing kfree call.
> >
> > SOF also uses some of the snd_hdac_ functions for HDAudio support
> > but allocated the memory with kzalloc. A matching fix is provided
> > separately to align all users of the snd_hdac_ library.
>
> There are stability issues with this change (already shared in a
> separate series) and additional findings reported by Libin so this
> should not be applied for now.
>

Yes, as mentioned in cover letter there is pending discussion, I
provided it for completeness.

> >
> > Fixes: 6298542fa33b ("ALSA: hdac: remove memory allocation from
> > snd_hdac_ext_bus_device_init") Reviewed-by: Takashi Iwai
> > <tiwai@suse.de> Signed-off-by: Amadeusz Sławiński
> > <amadeuszx.slawinski@linux.intel.com> Signed-off-by: Pierre-Louis
> > Bossart <pierre-louis.bossart@linux.intel.com> ---
> > sound/hda/ext/hdac_ext_bus.c | 1 -
> > 1 file changed, 1 deletion(-)
> >
> > diff --git a/sound/hda/ext/hdac_ext_bus.c
> > b/sound/hda/ext/hdac_ext_bus.c index c203af71a099..f33ba58b753c
> > 100644 --- a/sound/hda/ext/hdac_ext_bus.c
> > +++ b/sound/hda/ext/hdac_ext_bus.c
> > @@ -170,7 +170,6 @@ EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_device_init);
> > void snd_hdac_ext_bus_device_exit(struct hdac_device *hdev)
> > {
> > snd_hdac_device_exit(hdev);
> > - kfree(hdev);
> > }
> > EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_device_exit);
> >
> >
>
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> Alsa-devel@alsa-project.org
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