wifi: rtw88: use kstrtoX_from_user() in debugfs handlers

When 'sscanf()' is not needed to scan an input, prefer common
'kstrtoX_from_user()' over 'rtw_debugfs_copy_from_user()' with
following 'kstrtoX()'. Minor adjustments, compile tested only.
Signed-off-by: Dmitry Antipov <dmantipov@yandex.ru>
Acked-by: Ping-Ke Shih <pkshih@realtek.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://msgid.link/20240110132930.438828-1-dmantipov@yandex.ru

drivers/net/wireless/realtek/rtw88/debug.c

@@ -316,23 +316,13 @@ static ssize_t rtw_debugfs_set_single_input(struct file *filp,
 {
 	struct seq_file *seqpriv = (struct seq_file *)filp->private_data;
 	struct rtw_debugfs_priv *debugfs_priv = seqpriv->private;
-	struct rtw_dev *rtwdev = debugfs_priv->rtwdev;
-	char tmp[32 + 1];
 	u32 input;
-	int num;
 	int ret;
 
-	ret = rtw_debugfs_copy_from_user(tmp, sizeof(tmp), buffer, count, 1);
+	ret = kstrtou32_from_user(buffer, count, 0, &input);
 	if (ret)
 		return ret;
 
-	num = kstrtoint(tmp, 0, &input);
-
-	if (num) {
-		rtw_warn(rtwdev, "kstrtoint failed\n");
-		return num;
-	}
-
 	debugfs_priv->cb_data = input;
 
 	return count;
@@ -485,19 +475,12 @@ static ssize_t rtw_debugfs_set_fix_rate(struct file *filp,
 	struct rtw_dev *rtwdev = debugfs_priv->rtwdev;
 	struct rtw_dm_info *dm_info = &rtwdev->dm_info;
 	u8 fix_rate;
-	char tmp[32 + 1];
 	int ret;
 
-	ret = rtw_debugfs_copy_from_user(tmp, sizeof(tmp), buffer, count, 1);
+	ret = kstrtou8_from_user(buffer, count, 0, &fix_rate);
 	if (ret)
 		return ret;
 
-	ret = kstrtou8(tmp, 0, &fix_rate);
-	if (ret) {
-		rtw_warn(rtwdev, "invalid args, [rate]\n");
-		return ret;
-	}
-
 	dm_info->fix_rate = fix_rate;
 
 	return count;
@@ -879,20 +862,13 @@ static ssize_t rtw_debugfs_set_coex_enable(struct file *filp,
 	struct rtw_debugfs_priv *debugfs_priv = seqpriv->private;
 	struct rtw_dev *rtwdev = debugfs_priv->rtwdev;
 	struct rtw_coex *coex = &rtwdev->coex;
-	char tmp[32 + 1];
 	bool enable;
 	int ret;
 
-	ret = rtw_debugfs_copy_from_user(tmp, sizeof(tmp), buffer, count, 1);
+	ret = kstrtobool_from_user(buffer, count, &enable);
 	if (ret)
 		return ret;
 
-	ret = kstrtobool(tmp, &enable);
-	if (ret) {
-		rtw_warn(rtwdev, "invalid arguments\n");
-		return ret;
-	}
-
 	mutex_lock(&rtwdev->mutex);
 	coex->manual_control = !enable;
 	mutex_unlock(&rtwdev->mutex);
@@ -951,18 +927,13 @@ static ssize_t rtw_debugfs_set_fw_crash(struct file *filp,
 	struct seq_file *seqpriv = (struct seq_file *)filp->private_data;
 	struct rtw_debugfs_priv *debugfs_priv = seqpriv->private;
 	struct rtw_dev *rtwdev = debugfs_priv->rtwdev;
-	char tmp[32 + 1];
 	bool input;
 	int ret;
 
-	ret = rtw_debugfs_copy_from_user(tmp, sizeof(tmp), buffer, count, 1);
+	ret = kstrtobool_from_user(buffer, count, &input);
 	if (ret)
 		return ret;
 
-	ret = kstrtobool(tmp, &input);
-	if (ret)
-		return -EINVAL;
-
 	if (!input)
 		return -EINVAL;
 
@@ -1030,11 +1001,12 @@ static ssize_t rtw_debugfs_set_dm_cap(struct file *filp,
 	struct rtw_debugfs_priv *debugfs_priv = seqpriv->private;
 	struct rtw_dev *rtwdev = debugfs_priv->rtwdev;
 	struct rtw_dm_info *dm_info = &rtwdev->dm_info;
-	int bit;
+	int ret, bit;
 	bool en;
 
-	if (kstrtoint_from_user(buffer, count, 10, &bit))
-		return -EINVAL;
+	ret = kstrtoint_from_user(buffer, count, 10, &bit);
+	if (ret)
+		return ret;
 
 	en = bit > 0;
 	bit = abs(bit);