linux-kernel - [PATCH 3/3] PM / devfreq: Convert to use sysfs_emit

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Date:   Tue, 24 Oct 2023 20:30:16 +0200
From:   Christian Marangi <ansuelsmth@...il.com>
To:     "Rafael J. Wysocki" <rafael@...nel.org>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        MyungJoo Ham <myungjoo.ham@...sung.com>,
        Kyungmin Park <kyungmin.park@...sung.com>,
        Chanwoo Choi <cw00.choi@...sung.com>,
        Christian Marangi <ansuelsmth@...il.com>,
        Takashi Iwai <tiwai@...e.de>,
        Jonghwa Lee <jonghwa3.lee@...sung.com>,
        linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org
Subject: [PATCH 3/3] PM / devfreq: Convert to use sysfs_emit_at() API

Follow the advice of the Documentation/filesystems/sysfs.rst and show()
should only use sysfs_emit() or sysfs_emit_at() when formatting the
value to be returned to user space.

Signed-off-by: Christian Marangi <ansuelsmth@...il.com>
---
 drivers/devfreq/devfreq.c | 37 +++++++++++++++++--------------------
 1 file changed, 17 insertions(+), 20 deletions(-)

diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c
index 81d9df89dde6..2345c86cf19b 100644
--- a/drivers/devfreq/devfreq.c
+++ b/drivers/devfreq/devfreq.c
@@ -1697,7 +1697,7 @@ static ssize_t trans_stat_show(struct device *dev,
 	max_state = df->max_state;
 
 	if (max_state == 0)
-		return scnprintf(buf, PAGE_SIZE, "Not Supported.\n");
+		return sysfs_emit(buf, "Not Supported.\n");
 
 	mutex_lock(&df->lock);
 	if (!df->stop_polling &&
@@ -1707,47 +1707,44 @@ static ssize_t trans_stat_show(struct device *dev,
 	}
 	mutex_unlock(&df->lock);
 
-	len += scnprintf(buf + len, PAGE_SIZE - len, "     From  :   To\n");
-	len += scnprintf(buf + len, PAGE_SIZE - len, "           :");
+	len += sysfs_emit_at(buf, len, "     From  :   To\n");
+	len += sysfs_emit_at(buf, len, "           :");
 	for (i = 0; i < max_state; i++) {
 		if (len >= PAGE_SIZE - 1)
 			break;
-		len += scnprintf(buf + len, PAGE_SIZE - len, "%10lu",
-				 df->freq_table[i]);
+		len += sysfs_emit_at(buf, len, "%10lu",
+				     df->freq_table[i]);
 	}
+
 	if (len >= PAGE_SIZE - 1)
 		return PAGE_SIZE - 1;
-
-	len += scnprintf(buf + len, PAGE_SIZE - len, "   time(ms)\n");
+	len += sysfs_emit_at(buf, len, "   time(ms)\n");
 
 	for (i = 0; i < max_state; i++) {
 		if (len >= PAGE_SIZE - 1)
 			break;
-		if (df->freq_table[i] == df->previous_freq)
-			len += scnprintf(buf + len, PAGE_SIZE - len, "*");
+		if (df->freq_table[2] == df->previous_freq)
+			len += sysfs_emit_at(buf, len, "*");
 		else
-			len += scnprintf(buf + len, PAGE_SIZE - len, " ");
+			len += sysfs_emit_at(buf, len, " ");
 		if (len >= PAGE_SIZE - 1)
 			break;
-
-		len += scnprintf(buf + len, PAGE_SIZE - len, "%10lu:",
-				 df->freq_table[i]);
+		len += sysfs_emit_at(buf, len, "%10lu:", df->freq_table[i]);
 		for (j = 0; j < max_state; j++) {
 			if (len >= PAGE_SIZE - 1)
 				break;
-			len += scnprintf(buf + len, PAGE_SIZE - len, "%10u",
-					 df->stats.trans_table[(i * max_state) + j]);
+			len += sysfs_emit_at(buf, len, "%10u",
+				df->stats.trans_table[(i * max_state) + j]);
 		}
 		if (len >= PAGE_SIZE - 1)
 			break;
-		len += scnprintf(buf + len, PAGE_SIZE - len, "%10llu\n", (u64)
-				 jiffies64_to_msecs(df->stats.time_in_state[i]));
+		len += sysfs_emit_at(buf, len, "%10llu\n", (u64)
+				     jiffies64_to_msecs(df->stats.time_in_state[i]));
 	}
 
 	if (len < PAGE_SIZE - 1)
-		len += scnprintf(buf + len, PAGE_SIZE - len, "Total transition : %u\n",
-				 df->stats.total_trans);
-
+		len += sysfs_emit_at(buf, len, "Total transition : %u\n",
+				     df->stats.total_trans);
 	if (len >= PAGE_SIZE - 1) {
 		pr_warn_once("devfreq transition table exceeds PAGE_SIZE. Disabling\n");
 		return -EFBIG;
-- 
2.40.1