[PATCH v2 2/2] ASoC: wm_adsp: Return whether changed when writing controls

Richard Fitzgerald
2022-11-23T16:58:31Z

From: Simon Trimmer <simont@opensource.cirrus.com>

Functions that update cs_dsp controls need to handle return codes that
indicate whether the control value changed. A return code of 1 indicates
a change, 0 indicates no-change and a negative value is an error
condition.

Acked controls implicitly change value when written so a successful
write shall always report that the value changed.

Signed-off-by: Simon Trimmer <simont@opensource.cirrus.com>
Signed-off-by: Richard Fitzgerald <rf@opensource.cirrus.com>
---
sound/soc/codecs/wm_adsp.c | 27 ++++++++++++++++++---------
1 file changed, 18 insertions(+), 9 deletions(-)

diff --git a/sound/soc/codecs/wm_adsp.c b/sound/soc/codecs/wm_adsp.c
index 34a94b011518..02fbffd73853 100644
--- a/sound/soc/codecs/wm_adsp.c
+++ b/sound/soc/codecs/wm_adsp.c
@@ -19,6 +19,7 @@
#include <linux/regmap.h>
#include <linux/regulator/consumer.h>
#include <linux/slab.h>
+#include <linux/vmalloc.h>
#include <linux/workqueue.h>
#include <linux/debugfs.h>
#include <sound/core.h>
@@ -419,16 +420,21 @@ static int wm_coeff_tlv_put(struct snd_kcontrol *kctl,
(struct soc_bytes_ext *)kctl->private_value;
struct wm_coeff_ctl *ctl = bytes_ext_to_ctl(bytes_ext);
struct cs_dsp_coeff_ctl *cs_ctl = ctl->cs_ctl;
+ void *scratch;
int ret = 0;

- mutex_lock(&cs_ctl->dsp->pwr_lock);
+ scratch = vmalloc(size);
+ if (!scratch)
+ return -ENOMEM;

- if (copy_from_user(cs_ctl->cache, bytes, size))
+ if (copy_from_user(scratch, bytes, size)) {
ret = -EFAULT;
- else
- ret = cs_dsp_coeff_write_ctrl(cs_ctl, 0, cs_ctl->cache, size);
-
- mutex_unlock(&cs_ctl->dsp->pwr_lock);
+ } else {
+ mutex_lock(&cs_ctl->dsp->pwr_lock);
+ ret = cs_dsp_coeff_write_ctrl(cs_ctl, 0, scratch, size);
+ mutex_unlock(&cs_ctl->dsp->pwr_lock);
+ }
+ vfree(scratch);

return ret;
}
@@ -455,7 +461,10 @@ static int wm_coeff_put_acked(struct snd_kcontrol *kctl,

mutex_unlock(&cs_ctl->dsp->pwr_lock);

- return ret;
+ if (ret < 0)
+ return ret;
+
+ return 1;
}

static int wm_coeff_get(struct snd_kcontrol *kctl,
@@ -682,10 +691,10 @@ int wm_adsp_write_ctl(struct wm_adsp *dsp, const char *name, int type,
int ret;

ret = cs_dsp_coeff_write_ctrl(cs_ctl, 0, buf, len);
- if (ret)
+ if (ret < 0)
return ret;

- if (cs_ctl->flags & WMFW_CTL_FLAG_SYS)
+ if (ret == 0 || (cs_ctl->flags & WMFW_CTL_FLAG_SYS))
return 0;

ctl = cs_ctl->priv;
--
2.30.2