ASoC: SOF: Remove strsplit_u32() and tokenize_input()

Make use of global integer-array parsing helper instead of the internal
one as both serve same purpose. With that, both strsplit_u32() and
tokenize_input() become unused so remove them.
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Cezary Rojewski <cezary.rojewski@intel.com>
Link: https://lore.kernel.org/r/20220904102840.862395-3-cezary.rojewski@intel.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/sof/sof-client-probes.c

@@ -12,6 +12,8 @@
 #include <linux/debugfs.h>
 #include <linux/module.h>
 #include <linux/pm_runtime.h>
+#include <linux/string_helpers.h>
+
 #include <sound/soc.h>
 #include <sound/sof/header.h>
 #include "sof-client.h"
@@ -410,79 +412,6 @@ static const struct snd_compress_ops sof_probes_compressed_ops = {
 	.copy = sof_probes_compr_copy,
 };
 
-/**
- * strsplit_u32 - Split string into sequence of u32 tokens
- * @buf:	String to split into tokens.
- * @delim:	String containing delimiter characters.
- * @tkns:	Returned u32 sequence pointer.
- * @num_tkns:	Returned number of tokens obtained.
- */
-static int strsplit_u32(char *buf, const char *delim, u32 **tkns, size_t *num_tkns)
-{
-	char *s;
-	u32 *data, *tmp;
-	size_t count = 0;
-	size_t cap = 32;
-	int ret = 0;
-
-	*tkns = NULL;
-	*num_tkns = 0;
-	data = kcalloc(cap, sizeof(*data), GFP_KERNEL);
-	if (!data)
-		return -ENOMEM;
-
-	while ((s = strsep(&buf, delim)) != NULL) {
-		ret = kstrtouint(s, 0, data + count);
-		if (ret)
-			goto exit;
-		if (++count >= cap) {
-			cap *= 2;
-			tmp = krealloc(data, cap * sizeof(*data), GFP_KERNEL);
-			if (!tmp) {
-				ret = -ENOMEM;
-				goto exit;
-			}
-			data = tmp;
-		}
-	}
-
-	if (!count)
-		goto exit;
-	*tkns = kmemdup(data, count * sizeof(*data), GFP_KERNEL);
-	if (!(*tkns)) {
-		ret = -ENOMEM;
-		goto exit;
-	}
-	*num_tkns = count;
-
-exit:
-	kfree(data);
-	return ret;
-}
-
-static int tokenize_input(const char __user *from, size_t count,
-			  loff_t *ppos, u32 **tkns, size_t *num_tkns)
-{
-	char *buf;
-	int ret;
-
-	buf = kmalloc(count + 1, GFP_KERNEL);
-	if (!buf)
-		return -ENOMEM;
-
-	ret = simple_write_to_buffer(buf, count, ppos, from, count);
-	if (ret != count) {
-		ret = ret >= 0 ? -EIO : ret;
-		goto exit;
-	}
-
-	buf[count] = '\0';
-	ret = strsplit_u32(buf, ",", tkns, num_tkns);
-exit:
-	kfree(buf);
-	return ret;
-}
-
 static ssize_t sof_probes_dfs_points_read(struct file *file, char __user *to,
 					  size_t count, loff_t *ppos)
 {
@@ -548,8 +477,8 @@ sof_probes_dfs_points_write(struct file *file, const char __user *from,
 	struct sof_probes_priv *priv = cdev->data;
 	struct device *dev = &cdev->auxdev.dev;
 	struct sof_probe_point_desc *desc;
-	size_t num_tkns, bytes;
-	u32 *tkns;
+	u32 num_elems, *array;
+	size_t bytes;
 	int ret, err;
 
 	if (priv->extractor_stream_tag == SOF_PROBES_INVALID_NODE_ID) {
@@ -557,16 +486,18 @@ sof_probes_dfs_points_write(struct file *file, const char __user *from,
 		return -ENOENT;
 	}
 
-	ret = tokenize_input(from, count, ppos, &tkns, &num_tkns);
+	ret = parse_int_array_user(from, count, (int **)&array);
 	if (ret < 0)
 		return ret;
-	bytes = sizeof(*tkns) * num_tkns;
-	if (!num_tkns || (bytes % sizeof(*desc))) {
+
+	num_elems = *array;
+	bytes = sizeof(*array) * num_elems;
+	if (bytes % sizeof(*desc)) {
 		ret = -EINVAL;
 		goto exit;
 	}
 
-	desc = (struct sof_probe_point_desc *)tkns;
+	desc = (struct sof_probe_point_desc *)&array[1];
 
 	ret = pm_runtime_resume_and_get(dev);
 	if (ret < 0 && ret != -EACCES) {
@@ -583,7 +514,7 @@ sof_probes_dfs_points_write(struct file *file, const char __user *from,
 	if (err < 0)
 		dev_err_ratelimited(dev, "debugfs write failed to idle %d\n", err);
 exit:
-	kfree(tkns);
+	kfree(array);
 	return ret;
 }
 
@@ -603,22 +534,17 @@ sof_probes_dfs_points_remove_write(struct file *file, const char __user *from,
 	struct sof_client_dev *cdev = file->private_data;
 	struct sof_probes_priv *priv = cdev->data;
 	struct device *dev = &cdev->auxdev.dev;
-	size_t num_tkns;
-	u32 *tkns;
 	int ret, err;
+	u32 *array;
 
 	if (priv->extractor_stream_tag == SOF_PROBES_INVALID_NODE_ID) {
 		dev_warn(dev, "no extractor stream running\n");
 		return -ENOENT;
 	}
 
-	ret = tokenize_input(from, count, ppos, &tkns, &num_tkns);
+	ret = parse_int_array_user(from, count, (int **)&array);
 	if (ret < 0)
 		return ret;
-	if (!num_tkns) {
-		ret = -EINVAL;
-		goto exit;
-	}
 
 	ret = pm_runtime_resume_and_get(dev);
 	if (ret < 0) {
@@ -626,7 +552,7 @@ sof_probes_dfs_points_remove_write(struct file *file, const char __user *from,
 		goto exit;
 	}
 
-	ret = sof_probes_points_remove(cdev, tkns, num_tkns);
+	ret = sof_probes_points_remove(cdev, &array[1], array[0]);
 	if (!ret)
 		ret = count;
 
@@ -635,7 +561,7 @@ sof_probes_dfs_points_remove_write(struct file *file, const char __user *from,
 	if (err < 0)
 		dev_err_ratelimited(dev, "debugfs write failed to idle %d\n", err);
 exit:
-	kfree(tkns);
+	kfree(array);
 	return ret;
 }