net: dsa: microchip: ksz8_r_dyn_mac_table(): return read/write error if we got any

The read/write path may fail. So, return error if we got it.
Reviewed-by: Vladimir Oltean <olteanv@gmail.com>
Acked-by: Arun Ramadoss <arun.ramadoss@microchip.com>
Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
Reviewed-by: Florian Fainelli <florian.fainelli@broadcom.com>
Link: https://lore.kernel.org/r/20240403125039.3414824-8-o.rempel@pengutronix.deSigned-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/dsa/microchip/ksz8795.c

@@ -385,12 +385,16 @@ static int ksz8_valid_dyn_entry(struct ksz_device *dev, u8 *data)
 	int timeout = 100;
 	const u32 *masks;
 	const u16 *regs;
+	int ret;
 
 	masks = dev->info->masks;
 	regs = dev->info->regs;
 
 	do {
-		ksz_read8(dev, regs[REG_IND_DATA_CHECK], data);
+		ret = ksz_read8(dev, regs[REG_IND_DATA_CHECK], data);
+		if (ret)
+			return ret;
+
 		timeout--;
 	} while ((*data & masks[DYNAMIC_MAC_TABLE_NOT_READY]) && timeout);
 
@@ -399,7 +403,9 @@ static int ksz8_valid_dyn_entry(struct ksz_device *dev, u8 *data)
 		return -ETIMEDOUT;
 	/* Entry is ready for accessing. */
 	} else {
-		ksz_read8(dev, regs[REG_IND_DATA_8], data);
+		ret = ksz_read8(dev, regs[REG_IND_DATA_8], data);
+		if (ret)
+			return ret;
 
 		/* There is no valid entry in the table. */
 		if (*data & masks[DYNAMIC_MAC_TABLE_MAC_EMPTY])
@@ -428,7 +434,9 @@ static int ksz8_r_dyn_mac_table(struct ksz_device *dev, u16 addr, u8 *mac_addr,
 	ctrl_addr = IND_ACC_TABLE(TABLE_DYNAMIC_MAC | TABLE_READ) | addr;
 
 	mutex_lock(&dev->alu_mutex);
-	ksz_write16(dev, regs[REG_IND_CTRL_0], ctrl_addr);
+	ret = ksz_write16(dev, regs[REG_IND_CTRL_0], ctrl_addr);
+	if (ret)
+		goto unlock_alu;
 
 	ret = ksz8_valid_dyn_entry(dev, &data);
 	if (ret == -ENXIO) {
@@ -439,7 +447,10 @@ static int ksz8_r_dyn_mac_table(struct ksz_device *dev, u16 addr, u8 *mac_addr,
 	if (ret)
 		goto unlock_alu;
 
-	ksz_read64(dev, regs[REG_IND_DATA_HI], &buf);
+	ret = ksz_read64(dev, regs[REG_IND_DATA_HI], &buf);
+	if (ret)
+		goto unlock_alu;
+
 	data_hi = (u32)(buf >> 32);
 	data_lo = (u32)buf;
 
@@ -462,7 +473,6 @@ static int ksz8_r_dyn_mac_table(struct ksz_device *dev, u16 addr, u8 *mac_addr,
 
 	mac_addr[1] = (u8)data_hi;
 	mac_addr[0] = (u8)(data_hi >> 8);
-	ret = 0;
 
 unlock_alu:
 	mutex_unlock(&dev->alu_mutex);