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

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Date: Fri, 15 Mar 2024 18:07:47 +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>, <netdev@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>
Subject: [PATCH net 2/3] net: hns3: fix kernel crash when devlink reload during pf initialization

From: Yonglong Liu <liuyonglong@...wei.com>

The devlink reload process will access the hardware resources,
but the register operation is before the hardware initialize
done, so, if process the devlink reload during initializetion,
may lead the kernel crash. This patch check whether the NIC is
initialized to fix the problem.

Fixes: b741269b2759 ("net: hns3: add support for registering devlink for PF")
Signed-off-by: Yonglong Liu <liuyonglong@...wei.com>
Signed-off-by: Jijie Shao <shaojijie@...wei.com>
---
 drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_devlink.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_devlink.c b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_devlink.c
index 9a939c0b217f..80db4f7b05f6 100644
--- a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_devlink.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_devlink.c
@@ -40,8 +40,9 @@ static int hclge_devlink_reload_down(struct devlink *devlink, bool netns_change,
 	struct pci_dev *pdev = hdev->pdev;
 	int ret;
 
-	if (test_bit(HCLGE_STATE_RST_HANDLING, &hdev->state)) {
-		dev_err(&pdev->dev, "reset is handling\n");
+	if (test_bit(HCLGE_STATE_RST_HANDLING, &hdev->state) ||
+	    !test_bit(HCLGE_STATE_NIC_REGISTERED, &hdev->state)) {
+		dev_err(&pdev->dev, "reset is handling or driver removed\n");
 		return -EBUSY;
 	}
 
-- 
2.30.0