This is a note to let you know that I've just added the patch titled ASoC: wm_adsp: Pass full name to snd_ctl_notify to the 5.8-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: asoc-wm_adsp-pass-full-name-to-snd_ctl_notify.patch and it can be found in the queue-5.8 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit 7429c5cf5d9c5e989a3ed14905504b3ee671ef2d Author: Adam Brickman <Adam.Brickman@xxxxxxxxxx> Date: Thu Oct 1 16:24:25 2020 +0100 ASoC: wm_adsp: Pass full name to snd_ctl_notify [ Upstream commit 20441614d89867142060d3bcd79cc111d8ba7a8e ] A call to wm_adsp_write_ctl() could cause a kernel crash if it does not retrieve a valid kcontrol from snd_soc_card_get_kcontrol(). This can happen due to a missing control name prefix. Then, snd_ctl_notify() crashes when it tries to use the id field. Modified wm_adsp_write_ctl() to incorporate the name_prefix (if applicable) such that it is able to retrieve a valid id field from the kcontrol once the platform has booted. Fixes: eb65ccdb0836 ("ASoC: wm_adsp: Expose mixer control API") Signed-off-by: Adam Brickman <Adam.Brickman@xxxxxxxxxx> Signed-off-by: Charles Keepax <ckeepax@xxxxxxxxxxxxxxxxxxxxx> Link: https://lore.kernel.org/r/20201001152425.8590-1-ckeepax@xxxxxxxxxxxxxxxxxxxxx Signed-off-by: Mark Brown <broonie@xxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> diff --git a/sound/soc/codecs/wm_adsp.c b/sound/soc/codecs/wm_adsp.c index 519ca2e696372..18f62fde92537 100644 --- a/sound/soc/codecs/wm_adsp.c +++ b/sound/soc/codecs/wm_adsp.c @@ -2043,6 +2043,7 @@ int wm_adsp_write_ctl(struct wm_adsp *dsp, const char *name, int type, { struct wm_coeff_ctl *ctl; struct snd_kcontrol *kcontrol; + char ctl_name[SNDRV_CTL_ELEM_ID_NAME_MAXLEN]; int ret; ctl = wm_adsp_get_ctl(dsp, name, type, alg); @@ -2053,8 +2054,25 @@ int wm_adsp_write_ctl(struct wm_adsp *dsp, const char *name, int type, return -EINVAL; ret = wm_coeff_write_ctrl(ctl, buf, len); + if (ret) + return ret; + + if (ctl->flags & WMFW_CTL_FLAG_SYS) + return 0; + + if (dsp->component->name_prefix) + snprintf(ctl_name, SNDRV_CTL_ELEM_ID_NAME_MAXLEN, "%s %s", + dsp->component->name_prefix, ctl->name); + else + snprintf(ctl_name, SNDRV_CTL_ELEM_ID_NAME_MAXLEN, "%s", + ctl->name); + + kcontrol = snd_soc_card_get_kcontrol(dsp->component->card, ctl_name); + if (!kcontrol) { + adsp_err(dsp, "Can't find kcontrol %s\n", ctl_name); + return -EINVAL; + } - kcontrol = snd_soc_card_get_kcontrol(dsp->component->card, ctl->name); snd_ctl_notify(dsp->component->card->snd_card, SNDRV_CTL_EVENT_MASK_VALUE, &kcontrol->id);