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Date:   Thu, 6 Jun 2019 14:57:44 +0200
From:   Amadeusz Sławiński 
        <amadeuszx.slawinski@...ux.intel.com>
To:     Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
Cc:     alsa-devel@...a-project.org,
        Cezary Rojewski <cezary.rojewski@...el.com>,
        linux-kernel@...r.kernel.org, Jie Yang <yang.jie@...ux.intel.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Takashi Iwai <tiwai@...e.com>, Mark Brown <broonie@...nel.org>
Subject: Re: [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@...ux.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@...e.de> Signed-off-by: Amadeusz Sławiński
> > <amadeuszx.slawinski@...ux.intel.com> Signed-off-by: Pierre-Louis
> > Bossart <pierre-louis.bossart@...ux.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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