From mboxrd@z Thu Jan  1 00:00:00 1970
From: Clemens Ladisch <clemens@ladisch.de>
Subject: Re: calling snd_ctl_notify from mixer ctl_put
Date: Fri, 12 Oct 2012 08:03:13 +0200
Message-ID: <5077B2A1.5070608@ladisch.de>
References: <201210112129.03097.linux@rainbow-software.org>
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To: Ondrej Zary <linux@rainbow-software.org>
Cc: alsa-devel@alsa-project.org
List-Id: alsa-devel@alsa-project.org

Ondrej Zary wrote:
> I want to enable/disable some mixer controls based on state of another control
> (switching between limiter and AGC mode). So I (re)set the
> SNDRV_CTL_ELEM_ACCESS_INACTIVE flag in kctl->vd[0].access
> and then call snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_INFO, &kctl->id);
> Everyting from ctl_put() mixer callback.
>
> When changing the control value in alsamixer, it crashes with:
> alsamixer: simple.c:948: snd_mixer_selem_get_enum_item: Assertion
> `(elem)->type == SND_MIXER_ELEM_SIMPLE' failed.

Looks like a bug in alsamixer.


Regards,
Clemens