Re: [RFC PATCH net-next v5 07/25] net: dsa: qca8k: handle error with qca8k_rmw operation

-static u32
-qca8k_rmw(struct qca8k_priv *priv, u32 reg, u32 mask, u32 val)
+static int
+qca8k_rmw(struct qca8k_priv *priv, u32 reg, u32 mask, u32 write_val)
 {
 	struct mii_bus *bus = priv->bus;
 	u16 r1, r2, page;
-	u32 ret;
+	u32 val;
+	int ret;
 
 	qca8k_split_addr(reg, &r1, &r2, &page);
 

@@ -205,10 +206,15 @@ qca8k_rmw(struct qca8k_priv *priv, u32 reg, u32 mask, u32 val)
 	if (ret < 0)
 		goto exit;
 
-	ret = qca8k_mii_read32(bus, 0x10 | r2, r1);
-	ret &= ~mask;
-	ret |= val;
-	qca8k_mii_write32(bus, 0x10 | r2, r1, ret);
+	val = qca8k_mii_read32(bus, 0x10 | r2, r1);
+	if (val < 0) {
+		ret = val;
+		goto exit;
+	}
+
+	val &= ~mask;
+	val |= write_val;
+	qca8k_mii_write32(bus, 0x10 | r2, r1, val);