[PATCH] e1000e: Add error handling for e1e_rphy_locked()

[Wentao Liang]

The e1000_suspend_workarounds_ich8lan() calls e1e_rphy_locked to disable
the SMB release, but does not check its return value. A proper
implementation can be found in e1000_resume_workarounds_pchlan() from
/source/drivers/net/ethernet/intel/e1000e/ich8lan.c.

Add an error check for e1e_rphy_locked(). Log the error message and jump
to 'release' label if the e1e_rphy_locked() fails.

Fixes: 2fbe4526e5aa ("e1000e: initial support for i217")
Cc: stable@xxxxxxxxxxxxxxx # v3.5+
Signed-off-by: Wentao Liang <vulab@xxxxxxxxxxx>
---
 drivers/net/ethernet/intel/e1000e/ich8lan.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/intel/e1000e/ich8lan.c b/drivers/net/ethernet/intel/e1000e/ich8lan.c
index 2f9655cf5dd9..d16e3aa50809 100644
--- a/drivers/net/ethernet/intel/e1000e/ich8lan.c
+++ b/drivers/net/ethernet/intel/e1000e/ich8lan.c
@@ -5497,7 +5497,11 @@ void e1000_suspend_workarounds_ich8lan(struct e1000_hw *hw)
 			e1e_wphy_locked(hw, I217_SxCTRL, phy_reg);
 
 			/* Disable the SMB release on LCD reset. */
-			e1e_rphy_locked(hw, I217_MEMPWR, &phy_reg);
+			ret_val = e1e_rphy_locked(hw, I217_MEMPWR, &phy_reg);
+			if (ret_val) {
+				e_dbg("Fail to Disable the SMB release on LCD reset.");
+				goto release;
+			}
 			phy_reg &= ~I217_MEMPWR_DISABLE_SMB_RELEASE;
 			e1e_wphy_locked(hw, I217_MEMPWR, phy_reg);
 		}
-- 
2.42.0.windows.2