[PATCH V4 net 2/3] net: hns3: fix kernel crash when devlink reload during pf initialization

From: Jijie Shao <shaojijie@huawei.com>
To: <yisen.zhuang@huawei.com>, <salil.mehta@huawei.com>,
	<davem@davemloft.net>, <edumazet@google.com>, <kuba@kernel.org>,
	<pabeni@redhat.com>, <michal.kubiak@intel.com>,
	<rkannoth@marvell.com>, <jiri@resnulli.us>
Cc: <shenjian15@huawei.com>, <wangjie125@huawei.com>,
	<liuyonglong@huawei.com>, <shaojijie@huawei.com>,
	<netdev@vger.kernel.org>, <linux-kernel@vger.kernel.org>
Subject: [PATCH V4 net 2/3] net: hns3: fix kernel crash when devlink reload during pf initialization
Date: Mon, 25 Mar 2024 20:43:10 +0800	[thread overview]
Message-ID: <20240325124311.1866197-3-shaojijie@huawei.com> (raw)
In-Reply-To: <20240325124311.1866197-1-shaojijie@huawei.com>

From: Yonglong Liu <liuyonglong@huawei.com>

The devlink reload process will access the hardware resources,
but the register operation is done before the hardware is initialized.
So, processing the devlink reload during initialization may lead to kernel
crash. This patch fixes this by taking devl_lock during initialization.

Fixes: b741269b2759 ("net: hns3: add support for registering devlink for PF")
Signed-off-by: Yonglong Liu <liuyonglong@huawei.com>
Signed-off-by: Jijie Shao <shaojijie@huawei.com>
---
 drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c
index b4afb66efe5c..ff6a2ed23ddb 100644
--- a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c
@@ -11626,6 +11626,8 @@ static int hclge_init_ae_dev(struct hnae3_ae_dev *ae_dev)
 	if (ret)
 		goto err_pci_uninit;
 
+	devl_lock(hdev->devlink);
+
 	/* Firmware command queue initialize */
 	ret = hclge_comm_cmd_queue_init(hdev->pdev, &hdev->hw.hw);
 	if (ret)
@@ -11805,6 +11807,7 @@ static int hclge_init_ae_dev(struct hnae3_ae_dev *ae_dev)
 
 	hclge_task_schedule(hdev, round_jiffies_relative(HZ));
 
+	devl_unlock(hdev->devlink);
 	return 0;
 
 err_mdiobus_unreg:
@@ -11817,6 +11820,7 @@ static int hclge_init_ae_dev(struct hnae3_ae_dev *ae_dev)
 err_cmd_uninit:
 	hclge_comm_cmd_uninit(hdev->ae_dev, &hdev->hw.hw);
 err_devlink_uninit:
+	devl_unlock(hdev->devlink);
 	hclge_devlink_uninit(hdev);
 err_pci_uninit:
 	pcim_iounmap(pdev, hdev->hw.hw.io_base);
-- 
2.30.0

