[PATCH v3] ASoC: ti: omap-mcbsp: duplicate sysfs error

[David Owens]

Convert to managed versions of sysfs and clk allocation to simplify
unbinding and error handling in probe.  Managed sysfs node
creation specifically addresses the following error seen the second time
probe is attempted after sdma_pcm_platform_register() previously requested
probe deferral:

sysfs: cannot create duplicate filename '/devices/platform/68000000.ocp/49022000.mcbsp/max_tx_thres'

Signed-off-by: David Owens <dowens@xxxxxxxxxxxxxxxxxxxxx>
---

Changes in v3:
 * Whitespace changes only to allow clean applly

Changes in v2:
 * Improved error handling

---
 sound/soc/ti/omap-mcbsp-priv.h |  2 --
 sound/soc/ti/omap-mcbsp-st.c   | 21 ++++-----------------
 sound/soc/ti/omap-mcbsp.c      | 26 ++++----------------------
 3 files changed, 8 insertions(+), 41 deletions(-)

diff --git a/sound/soc/ti/omap-mcbsp-priv.h b/sound/soc/ti/omap-mcbsp-priv.h
index 7865cda4bf0a..da519ea1f303 100644
--- a/sound/soc/ti/omap-mcbsp-priv.h
+++ b/sound/soc/ti/omap-mcbsp-priv.h
@@ -316,8 +316,6 @@ static inline int omap_mcbsp_read(struct omap_mcbsp *mcbsp, u16 reg,
 
 /* Sidetone specific API */
 int omap_mcbsp_st_init(struct platform_device *pdev);
-void omap_mcbsp_st_cleanup(struct platform_device *pdev);
-
 int omap_mcbsp_st_start(struct omap_mcbsp *mcbsp);
 int omap_mcbsp_st_stop(struct omap_mcbsp *mcbsp);
 
diff --git a/sound/soc/ti/omap-mcbsp-st.c b/sound/soc/ti/omap-mcbsp-st.c
index 0bc7d26c660a..402a57a502e6 100644
--- a/sound/soc/ti/omap-mcbsp-st.c
+++ b/sound/soc/ti/omap-mcbsp-st.c
@@ -292,14 +292,11 @@ static ssize_t st_taps_store(struct device *dev,
 
 static DEVICE_ATTR_RW(st_taps);
 
-static const struct attribute *sidetone_attrs[] = {
+static struct attribute *sidetone_attrs[] = {
 	&dev_attr_st_taps.attr,
 	NULL,
 };
-
-static const struct attribute_group sidetone_attr_group = {
-	.attrs = (struct attribute **)sidetone_attrs,
-};
+ATTRIBUTE_GROUPS(sidetone);
 
 int omap_mcbsp_st_start(struct omap_mcbsp *mcbsp)
 {
@@ -347,7 +344,7 @@ int omap_mcbsp_st_init(struct platform_device *pdev)
 	if (!st_data)
 		return -ENOMEM;
 
-	st_data->mcbsp_iclk = clk_get(mcbsp->dev, "ick");
+	st_data->mcbsp_iclk = devm_clk_get(mcbsp->dev, "ick");
 	if (IS_ERR(st_data->mcbsp_iclk)) {
 		dev_warn(mcbsp->dev,
 			 "Failed to get ick, sidetone might be broken\n");
@@ -359,7 +356,7 @@ int omap_mcbsp_st_init(struct platform_device *pdev)
 	if (!st_data->io_base_st)
 		return -ENOMEM;
 
-	ret = sysfs_create_group(&mcbsp->dev->kobj, &sidetone_attr_group);
+	ret = devm_device_add_group(mcbsp->dev, &sidetone_group);
 	if (ret)
 		return ret;
 
@@ -368,16 +365,6 @@ int omap_mcbsp_st_init(struct platform_device *pdev)
 	return 0;
 }
 
-void omap_mcbsp_st_cleanup(struct platform_device *pdev)
-{
-	struct omap_mcbsp *mcbsp = platform_get_drvdata(pdev);
-
-	if (mcbsp->st_data) {
-		sysfs_remove_group(&mcbsp->dev->kobj, &sidetone_attr_group);
-		clk_put(mcbsp->st_data->mcbsp_iclk);
-	}
-}
-
 static int omap_mcbsp_st_info_volsw(struct snd_kcontrol *kcontrol,
 				    struct snd_ctl_elem_info *uinfo)
 {
diff --git a/sound/soc/ti/omap-mcbsp.c b/sound/soc/ti/omap-mcbsp.c
index 4479d74f0a45..395493a2d965 100644
--- a/sound/soc/ti/omap-mcbsp.c
+++ b/sound/soc/ti/omap-mcbsp.c
@@ -595,16 +595,13 @@ static ssize_t dma_op_mode_store(struct device *dev,
 
 static DEVICE_ATTR_RW(dma_op_mode);
 
-static const struct attribute *additional_attrs[] = {
+static struct attribute *additional_attrs[] = {
 	&dev_attr_max_tx_thres.attr,
 	&dev_attr_max_rx_thres.attr,
 	&dev_attr_dma_op_mode.attr,
 	NULL,
 };
-
-static const struct attribute_group additional_attr_group = {
-	.attrs = (struct attribute **)additional_attrs,
-};
+ATTRIBUTE_GROUPS(additional);
 
 /*
  * McBSP1 and McBSP3 are directly mapped on 1610 and 1510.
@@ -702,8 +699,7 @@ static int omap_mcbsp_init(struct platform_device *pdev)
 		mcbsp->max_tx_thres = max_thres(mcbsp) - 0x10;
 		mcbsp->max_rx_thres = max_thres(mcbsp) - 0x10;
 
-		ret = sysfs_create_group(&mcbsp->dev->kobj,
-					 &additional_attr_group);
+		ret = devm_device_add_group(mcbsp->dev, &additional_group);
 		if (ret) {
 			dev_err(mcbsp->dev,
 				"Unable to create additional controls\n");
@@ -711,16 +707,7 @@ static int omap_mcbsp_init(struct platform_device *pdev)
 		}
 	}
 
-	ret = omap_mcbsp_st_init(pdev);
-	if (ret)
-		goto err_st;
-
-	return 0;
-
-err_st:
-	if (mcbsp->pdata->buffer_size)
-		sysfs_remove_group(&mcbsp->dev->kobj, &additional_attr_group);
-	return ret;
+	return omap_mcbsp_st_init(pdev);
 }
 
 /*
@@ -1431,11 +1418,6 @@ static int asoc_mcbsp_remove(struct platform_device *pdev)
 	if (cpu_latency_qos_request_active(&mcbsp->pm_qos_req))
 		cpu_latency_qos_remove_request(&mcbsp->pm_qos_req);
 
-	if (mcbsp->pdata->buffer_size)
-		sysfs_remove_group(&mcbsp->dev->kobj, &additional_attr_group);
-
-	omap_mcbsp_st_cleanup(pdev);
-
 	return 0;
 }
 
-- 
2.34.1