linux-kernel - [PATCH net 7/7] net: hns3: fix kernel crash when devlink reload during vf initialization

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Date: Mon, 22 Apr 2024 21:43:27 +0800
From: Jijie Shao <shaojijie@...wei.com>
To: <yisen.zhuang@...wei.com>, <salil.mehta@...wei.com>,
	<davem@...emloft.net>, <edumazet@...gle.com>, <kuba@...nel.org>,
	<pabeni@...hat.com>
CC: <shenjian15@...wei.com>, <wangjie125@...wei.com>,
	<liuyonglong@...wei.com>, <shaojijie@...wei.com>, <chenhao418@...wei.com>,
	<netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH net 7/7] net: hns3: fix kernel crash when devlink reload during vf initialization

From: Yonglong Liu <liuyonglong@...wei.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: cd6242991d2e ("net: hns3: add support for registering devlink for VF")
Signed-off-by: Yonglong Liu <liuyonglong@...wei.com>
Signed-off-by: Jijie Shao <shaojijie@...wei.com>
---
 drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_main.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_main.c b/drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_main.c
index 08db8e84be4e..3ee41943d15f 100644
--- a/drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_main.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_main.c
@@ -2849,6 +2849,8 @@ static int hclgevf_init_hdev(struct hclgevf_dev *hdev)
 	if (ret)
 		goto err_devlink_init;
 
+	devl_lock(hdev->devlink);
+
 	ret = hclge_comm_cmd_queue_init(hdev->pdev, &hdev->hw.hw);
 	if (ret)
 		goto err_cmd_queue_init;
@@ -2950,6 +2952,7 @@ static int hclgevf_init_hdev(struct hclgevf_dev *hdev)
 	hclgevf_task_schedule(hdev, round_jiffies_relative(HZ));
 	timer_setup(&hdev->reset_timer, hclgevf_reset_timer, 0);
 
+	devl_unlock(hdev->devlink);
 	return 0;
 
 err_config:
@@ -2960,6 +2963,7 @@ static int hclgevf_init_hdev(struct hclgevf_dev *hdev)
 err_cmd_init:
 	hclge_comm_cmd_uninit(hdev->ae_dev, &hdev->hw.hw);
 err_cmd_queue_init:
+	devl_unlock(hdev->devlink);
 	hclgevf_devlink_uninit(hdev);
 err_devlink_init:
 	hclgevf_pci_uninit(hdev);
-- 
2.30.0