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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Hao Chen <chenhao288@hisilicon.com>,
        Guangbin Huang <huangguangbin2@huawei.com>,
        "David S. Miller" <davem@davemloft.net>,
        Sasha Levin <sashal@kernel.org>
Subject: [PATCH 5.17 0818/1126] net: hns3: add netdev reset check for hns3_set_tunable()
Date:   Tue,  5 Apr 2022 09:26:05 +0200
Message-Id: <20220405070431.574524114@linuxfoundation.org>
In-Reply-To: <20220405070407.513532867@linuxfoundation.org>
References: <20220405070407.513532867@linuxfoundation.org>
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From: Hao Chen <chenhao288@hisilicon.com>

[ Upstream commit f5cd60169f981ca737c9e49c446506dfafc90a35 ]

When pci device reset failed, it does uninit operation and priv->ring
is NULL, it causes accessing NULL pointer error.

Add netdev reset check for hns3_set_tunable() to fix it.

Fixes: 99f6b5fb5f63 ("net: hns3: use bounce buffer when rx page can not be reused")
Signed-off-by: Hao Chen <chenhao288@hisilicon.com>
Signed-off-by: Guangbin Huang <huangguangbin2@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/net/ethernet/hisilicon/hns3/hns3_ethtool.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3_ethtool.c b/drivers/net/ethernet/hisilicon/hns3/hns3_ethtool.c
index 7591772c9a6b..1f6d6faeec24 100644
--- a/drivers/net/ethernet/hisilicon/hns3/hns3_ethtool.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3_ethtool.c
@@ -1764,9 +1764,6 @@ static int hns3_set_tx_spare_buf_size(struct net_device *netdev,
 	struct hnae3_handle *h = priv->ae_handle;
 	int ret;
 
-	if (hns3_nic_resetting(netdev))
-		return -EBUSY;
-
 	h->kinfo.tx_spare_buf_size = data;
 
 	ret = hns3_reset_notify(h, HNAE3_DOWN_CLIENT);
@@ -1797,6 +1794,11 @@ static int hns3_set_tunable(struct net_device *netdev,
 	struct hnae3_handle *h = priv->ae_handle;
 	int i, ret = 0;
 
+	if (hns3_nic_resetting(netdev) || !priv->ring) {
+		netdev_err(netdev, "failed to set tunable value, dev resetting!");
+		return -EBUSY;
+	}
+
 	switch (tuna->id) {
 	case ETHTOOL_TX_COPYBREAK:
 		priv->tx_copybreak = *(u32 *)data;
-- 
2.34.1