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.

Link: https://lore.kernel.org/all/20231024183016.14648-3-ansuelsmth@gmail.com/
Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>

Author: Ansuel

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;