linux-kernel - [PATCH 1/4][RFC] e1000e: save the return value of e1000e

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Date:   Wed, 11 Nov 2020 13:51:00 +0800
From:   Chen Yu <yu.c.chen@...el.com>
To:     intel-wired-lan@...ts.osuosl.org
Cc:     "Neftin, Sasha" <sasha.neftin@...el.com>,
        Len Brown <len.brown@...el.com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        "Brandt, Todd E" <todd.e.brandt@...el.com>,
        Zhang Rui <rui.zhang@...el.com>,
        Tony Nguyen <anthony.l.nguyen@...el.com>,
        Jesse Brandeburg <jesse.brandeburg@...el.com>,
        linux-kernel@...r.kernel.org, Chen Yu <yu.c.chen@...el.com>
Subject: [PATCH 1/4][RFC] e1000e: save the return value of e1000e_reset()

Sometimes e1000e_reset() might fail during reume from S3 due to
hardware/firmware issues. Actually the return value from e1000e_reset()
can be used by the caller to verify if the NIC succeed to initialize or
not.

Introduce a static function _e1000e_reset() which is derived
from e1000e_reset(), except that the former returns the result
of this reset.

No functional change expected.

Signed-off-by: Chen Yu <yu.c.chen@...el.com>
---
 drivers/net/ethernet/intel/e1000e/netdev.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/intel/e1000e/netdev.c b/drivers/net/ethernet/intel/e1000e/netdev.c
index b30f00891c03..f7c08426c0d7 100644
--- a/drivers/net/ethernet/intel/e1000e/netdev.c
+++ b/drivers/net/ethernet/intel/e1000e/netdev.c
@@ -3998,7 +3998,7 @@ static void e1000e_systim_reset(struct e1000_adapter *adapter)
  * set/changed during runtime. After reset the device needs to be
  * properly configured for Rx, Tx etc.
  */
-void e1000e_reset(struct e1000_adapter *adapter)
+static int _e1000e_reset(struct e1000_adapter *adapter)
 {
 	struct e1000_mac_info *mac = &adapter->hw.mac;
 	struct e1000_fc_info *fc = &adapter->hw.fc;
@@ -4191,14 +4191,14 @@ void e1000e_reset(struct e1000_adapter *adapter)
 		default:
 			dev_err(&adapter->pdev->dev,
 				"Invalid PHY type setting EEE advertisement\n");
-			return;
+			return -EINVAL;
 		}
 
 		ret_val = hw->phy.ops.acquire(hw);
 		if (ret_val) {
 			dev_err(&adapter->pdev->dev,
 				"EEE advertisement - unable to acquire PHY\n");
-			return;
+			return -EBUSY;
 		}
 
 		e1000_write_emi_reg_locked(hw, adv_addr,
@@ -4239,6 +4239,12 @@ void e1000e_reset(struct e1000_adapter *adapter)
 		ew32(FEXTNVM9, reg);
 	}
 
+	return 0;
+}
+
+void e1000e_reset(struct e1000_adapter *adapter)
+{
+	_e1000e_reset(adapter);
 }
 
 /**
-- 
2.17.1