linux-kernel - [PATCH 4.18 168/235] net: hns3: Reset net device with rtnl

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Message-Id: <20180924113121.759583406@linuxfoundation.org>
Date:   Mon, 24 Sep 2018 13:52:34 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Huazhong Tan <tanhuazhong@...wei.com>,
        Peng Li <lipeng321@...wei.com>,
        Salil Mehta <salil.mehta@...wei.com>,
        "David S. Miller" <davem@...emloft.net>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 4.18 168/235] net: hns3: Reset net device with rtnl_lock

4.18-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Huazhong Tan <tanhuazhong@...wei.com>

[ Upstream commit 6d4fab39533f1bcd933d82d1667ceea93e4de260 ]

Since current locking was not covering certain code where
netdev was being accessed or manipulated, this patch fixes
it.

Signed-off-by: Huazhong Tan <tanhuazhong@...wei.com>
Signed-off-by: Peng Li <lipeng321@...wei.com>
Signed-off-by: Salil Mehta <salil.mehta@...wei.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c |    5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

--- a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c
@@ -2825,15 +2825,13 @@ static void hclge_clear_reset_cause(stru
 static void hclge_reset(struct hclge_dev *hdev)
 {
 	/* perform reset of the stack & ae device for a client */
-
+	rtnl_lock();
 	hclge_notify_client(hdev, HNAE3_DOWN_CLIENT);
 
 	if (!hclge_reset_wait(hdev)) {
-		rtnl_lock();
 		hclge_notify_client(hdev, HNAE3_UNINIT_CLIENT);
 		hclge_reset_ae_dev(hdev->ae_dev);
 		hclge_notify_client(hdev, HNAE3_INIT_CLIENT);
-		rtnl_unlock();
 
 		hclge_clear_reset_cause(hdev);
 	} else {
@@ -2843,6 +2841,7 @@ static void hclge_reset(struct hclge_dev
 	}
 
 	hclge_notify_client(hdev, HNAE3_UP_CLIENT);
+	rtnl_unlock();
 }
 
 static void hclge_reset_event(struct hnae3_handle *handle)