[PATCH net v2 1/4] net: dsa: realtek: rtl8365mb: use devm_mutex_init for mib_lock

[Luiz Angelo Daros de Luca <luizluca@gmail.com>]

With CONFIG_DEBUG_MUTEXES enabled, mutex_destroy() needs to be called
before the lock is discarded. Use devm_mutex_init() instead so the
cleanup is handled automatically.

Fixes: 4af2950c50c86 ("net: dsa: realtek-smi: add rtl8365mb subdriver for RTL8365MB-VC")
Reviewed-by: Mieczyslaw Nalewaj <namiltd@yahoo.com>
Signed-off-by: Luiz Angelo Daros de Luca <luizluca@gmail.com>
---
 drivers/net/dsa/realtek/rtl8365mb_main.c | 16 +++++++++++++---
 1 file changed, 13 insertions(+), 3 deletions(-)

diff --git a/drivers/net/dsa/realtek/rtl8365mb_main.c b/drivers/net/dsa/realtek/rtl8365mb_main.c
index 5ac091bf93c9..aa05375b090a 100644
--- a/drivers/net/dsa/realtek/rtl8365mb_main.c
+++ b/drivers/net/dsa/realtek/rtl8365mb_main.c
@@ -1988,16 +1988,19 @@ static void rtl8365mb_get_stats64(struct dsa_switch *ds, int port,
 	spin_unlock(&p->stats_lock);
 }
 
-static void rtl8365mb_stats_setup(struct realtek_priv *priv)
+static int rtl8365mb_stats_setup(struct realtek_priv *priv)
 {
 	struct rtl8365mb *mb = priv->chip_data;
 	struct dsa_switch *ds = &priv->ds;
 	struct dsa_port *dp;
+	int ret;
 
 	/* Per-chip global mutex to protect MIB counter access, since doing
 	 * so requires accessing a series of registers in a particular order.
 	 */
-	mutex_init(&mb->mib_lock);
+	ret = devm_mutex_init(priv->dev, &mb->mib_lock);
+	if (ret)
+		return ret;
 
 	dsa_switch_for_each_available_port(dp, ds) {
 		struct rtl8365mb_port *p = &mb->ports[dp->index];
@@ -2010,6 +2013,8 @@ static void rtl8365mb_stats_setup(struct realtek_priv *priv)
 		 */
 		INIT_DELAYED_WORK(&p->mib_work, rtl8365mb_stats_poll);
 	}
+
+	return 0;
 }
 
 static void rtl8365mb_stats_teardown(struct realtek_priv *priv)
@@ -2567,7 +2572,12 @@ static int rtl8365mb_setup(struct dsa_switch *ds)
 	}
 
 	/* Start statistics counter polling */
-	rtl8365mb_stats_setup(priv);
+	ret = rtl8365mb_stats_setup(priv);
+	if (ret) {
+		dev_err(priv->dev, "failed to setup stats: %pe\n",
+			ERR_PTR(ret));
+		goto out_teardown_irq;
+	}
 
 	return 0;
 

-- 
2.55.0