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authorCharles Keepax <ckeepax@opensource.wolfsonmicro.com>2017-03-06 17:54:33 +0100
committerMark Brown <broonie@kernel.org>2017-03-07 13:07:58 +0100
commit67430a39ca7a6af28aade5acb92d43ee257c1014 (patch)
treef01f19d431c4ecb390f5d10c33c01a722b422caf
parentLinux 4.11-rc1 (diff)
downloadlinux-67430a39ca7a6af28aade5acb92d43ee257c1014.tar.xz
linux-67430a39ca7a6af28aade5acb92d43ee257c1014.zip
ASoC: wm_adsp: Return an error on write to a disabled volatile control
Volatile controls should only be accessed when the firmware is active, currently however writes to these controls will succeed, but the data will be lost, if the firmware is powered down. Update this behaviour such that an error is returned the same as it is for reads. Signed-off-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com> Signed-off-by: Mark Brown <broonie@kernel.org>
-rw-r--r--sound/soc/codecs/wm_adsp.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/sound/soc/codecs/wm_adsp.c b/sound/soc/codecs/wm_adsp.c
index d151224ffcca..6313b3da967b 100644
--- a/sound/soc/codecs/wm_adsp.c
+++ b/sound/soc/codecs/wm_adsp.c
@@ -899,7 +899,10 @@ static int wm_coeff_put(struct snd_kcontrol *kctl,
mutex_lock(&ctl->dsp->pwr_lock);
- memcpy(ctl->cache, p, ctl->len);
+ if (ctl->flags & WMFW_CTL_FLAG_VOLATILE)
+ ret = -EPERM;
+ else
+ memcpy(ctl->cache, p, ctl->len);
ctl->set = 1;
if (ctl->enabled && ctl->dsp->running)
@@ -926,6 +929,8 @@ static int wm_coeff_tlv_put(struct snd_kcontrol *kctl,
ctl->set = 1;
if (ctl->enabled && ctl->dsp->running)
ret = wm_coeff_write_control(ctl, ctl->cache, size);
+ else if (ctl->flags & WMFW_CTL_FLAG_VOLATILE)
+ ret = -EPERM;
}
mutex_unlock(&ctl->dsp->pwr_lock);