linux-kernel - [PATCH v2 2/2] ASoC: SOF: Remove strsplit_u32() and tokenize

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Message-Id: <20220825164833.3923454-3-cezary.rojewski@intel.com>
Date:   Thu, 25 Aug 2022 18:48:33 +0200
From:   Cezary Rojewski <cezary.rojewski@...el.com>
To:     alsa-devel@...a-project.org, broonie@...nel.org
Cc:     tiwai@...e.com, perex@...ex.cz,
        amadeuszx.slawinski@...ux.intel.com,
        pierre-louis.bossart@...ux.intel.com, hdegoede@...hat.com,
        lgirdwood@...il.com, kai.vehmanen@...ux.intel.com,
        peter.ujfalusi@...ux.intel.com, ranjani.sridharan@...ux.intel.com,
        yung-chuan.liao@...ux.intel.com, viro@...iv.linux.org.uk,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        andy.shevchenko@...il.com,
        Cezary Rojewski <cezary.rojewski@...el.com>
Subject: [PATCH v2 2/2] ASoC: SOF: Remove strsplit_u32() and tokenize_input()

Make use of global user input tokenization helper instead of the
internal one as both serve same purpose. With that, both strsplit_u32()
and tokenize_input() become unused so remove them.

Signed-off-by: Cezary Rojewski <cezary.rojewski@...el.com>
---
 sound/soc/sof/sof-client-probes.c | 92 ++++---------------------------
 1 file changed, 11 insertions(+), 81 deletions(-)

diff --git a/sound/soc/sof/sof-client-probes.c b/sound/soc/sof/sof-client-probes.c
index eb246b823461..3bab54cac07b 100644
--- a/sound/soc/sof/sof-client-probes.c
+++ b/sound/soc/sof/sof-client-probes.c
@@ -410,79 +410,6 @@ 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 +475,8 @@ 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;
+	size_t bytes;
+	u32 num_tkns, *tkns;
 	int ret, err;
 
 	if (priv->extractor_stream_tag == SOF_PROBES_INVALID_NODE_ID) {
@@ -557,16 +484,18 @@ sof_probes_dfs_points_write(struct file *file, const char __user *from,
 		return -ENOENT;
 	}
 
-	ret = tokenize_input(from, count, ppos, &tkns, &num_tkns);
+	ret = tokenize_user_input(from, count, (int **)&tkns);
 	if (ret < 0)
 		return ret;
+
+	num_tkns = *tkns;
 	bytes = sizeof(*tkns) * num_tkns;
 	if (!num_tkns || (bytes % sizeof(*desc))) {
 		ret = -EINVAL;
 		goto exit;
 	}
 
-	desc = (struct sof_probe_point_desc *)tkns;
+	desc = (struct sof_probe_point_desc *)&tkns[1];
 
 	ret = pm_runtime_resume_and_get(dev);
 	if (ret < 0 && ret != -EACCES) {
@@ -603,8 +532,7 @@ 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;
+	u32 num_tkns, *tkns;
 	int ret, err;
 
 	if (priv->extractor_stream_tag == SOF_PROBES_INVALID_NODE_ID) {
@@ -612,9 +540,11 @@ sof_probes_dfs_points_remove_write(struct file *file, const char __user *from,
 		return -ENOENT;
 	}
 
-	ret = tokenize_input(from, count, ppos, &tkns, &num_tkns);
+	ret = tokenize_user_input(from, count, (int **)&tkns);
 	if (ret < 0)
 		return ret;
+
+	num_tkns = *tkns;
 	if (!num_tkns) {
 		ret = -EINVAL;
 		goto exit;
@@ -626,7 +556,7 @@ 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, &tkns[1], num_tkns);
 	if (!ret)
 		ret = count;
 
-- 
2.25.1