[PATCH] igb: e1000_82575: add an error code check in igb_set_d0_lplu_state_82575

[Su Hui]

igb_set_d0_lplu_state_82575() check all phy->ops.read_reg()'s return value
except this one, just fix this.

Signed-off-by: Su Hui <suhui@xxxxxxxxxxxx>
---
 drivers/net/ethernet/intel/igb/e1000_82575.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/ethernet/intel/igb/e1000_82575.c b/drivers/net/ethernet/intel/igb/e1000_82575.c
index 8d6e44ee1895..e765d5ee3661 100644
--- a/drivers/net/ethernet/intel/igb/e1000_82575.c
+++ b/drivers/net/ethernet/intel/igb/e1000_82575.c
@@ -978,6 +978,9 @@ static s32 igb_set_d0_lplu_state_82575(struct e1000_hw *hw, bool active)
 		/* When LPLU is enabled, we should disable SmartSpeed */
 		ret_val = phy->ops.read_reg(hw, IGP01E1000_PHY_PORT_CONFIG,
 						&data);
+		if (ret_val)
+			goto out;
+
 		data &= ~IGP01E1000_PSCFR_SMART_SPEED;
 		ret_val = phy->ops.write_reg(hw, IGP01E1000_PHY_PORT_CONFIG,
 						 data);
-- 
2.30.2