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From:   lily <floridsleeves@gmail.com>
To:     intel-wired-lan@lists.osuosl.org, netdev@vger.kernel.org,
        linux-kernel@vger.kernel.org
Cc:     jesse.brandeburg@intel.com, anthony.l.nguyen@intel.com,
        davem@davemloft.net, edumazet@google.com, kuba@kernel.org,
        pabeni@redhat.com, lily <floridsleeves@gmail.com>
Subject: [PATCH v1] drivers/net/ethernet: check return value of e1e_rphy()
Date:   Mon, 22 Aug 2022 23:02:00 -0700
Message-Id: <20220823060200.1452663-1-floridsleeves@gmail.com>
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e1e_rphy() could return error value, which need to be checked.

Signed-off-by: Li Zhong <floridsleeves@gmail.com>
---
 drivers/net/ethernet/intel/e1000e/phy.c | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/intel/e1000e/phy.c b/drivers/net/ethernet/intel/e1000e/phy.c
index fd07c3679bb1..15ac302fdee0 100644
--- a/drivers/net/ethernet/intel/e1000e/phy.c
+++ b/drivers/net/ethernet/intel/e1000e/phy.c
@@ -2697,9 +2697,12 @@ static s32 e1000_access_phy_wakeup_reg_bm(struct e1000_hw *hw, u32 offset,
 void e1000_power_up_phy_copper(struct e1000_hw *hw)
 {
 	u16 mii_reg = 0;
+	int ret;
 
 	/* The PHY will retain its settings across a power down/up cycle */
-	e1e_rphy(hw, MII_BMCR, &mii_reg);
+	ret = e1e_rphy(hw, MII_BMCR, &mii_reg);
+	if (ret)
+		return ret;
 	mii_reg &= ~BMCR_PDOWN;
 	e1e_wphy(hw, MII_BMCR, mii_reg);
 }
@@ -2715,9 +2718,12 @@ void e1000_power_up_phy_copper(struct e1000_hw *hw)
 void e1000_power_down_phy_copper(struct e1000_hw *hw)
 {
 	u16 mii_reg = 0;
+	int ret;
 
 	/* The PHY will retain its settings across a power down/up cycle */
-	e1e_rphy(hw, MII_BMCR, &mii_reg);
+	ret = e1e_rphy(hw, MII_BMCR, &mii_reg);
+	if (ret)
+		return ret;
 	mii_reg |= BMCR_PDOWN;
 	e1e_wphy(hw, MII_BMCR, mii_reg);
 	usleep_range(1000, 2000);
@@ -3037,7 +3043,9 @@ s32 e1000_link_stall_workaround_hv(struct e1000_hw *hw)
 		return 0;
 
 	/* Do not apply workaround if in PHY loopback bit 14 set */
-	e1e_rphy(hw, MII_BMCR, &data);
+	ret_val = e1e_rphy(hw, MII_BMCR, &data);
+	if (ret_val)
+		return ret_val;
 	if (data & BMCR_LOOPBACK)
 		return 0;
 
-- 
2.25.1