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From: Huazhong Tan <tanhuazhong@huawei.com>
To: <davem@davemloft.net>
Cc: <netdev@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
	<salil.mehta@huawei.com>, <yisen.zhuang@huawei.com>,
	<linuxarm@huawei.com>, Huazhong Tan <tanhuazhong@huawei.com>,
	Peng Li <lipeng321@huawei.com>
Subject: [PATCH net-next 09/11] net: hns3: fix race conditions between reset and module loading & unloading
Date: Thu, 20 Jun 2019 16:52:43 +0800	[thread overview]
Message-ID: <1561020765-14481-10-git-send-email-tanhuazhong@huawei.com> (raw)
In-Reply-To: <1561020765-14481-1-git-send-email-tanhuazhong@huawei.com>

When loading or unloading module, it should wait for the reset task
done before it un-initializes the client, otherwise the reset task
may cause a NULL pointer reference.

Signed-off-by: Huazhong Tan <tanhuazhong@huawei.com>
Signed-off-by: Peng Li <lipeng321@huawei.com>
---
 .../ethernet/hisilicon/hns3/hns3pf/hclge_main.c    | 40 ++++++++++++++++++++++
 .../ethernet/hisilicon/hns3/hns3pf/hclge_main.h    |  1 +
 2 files changed, 41 insertions(+)

diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c
index 0772ca1..53dbef9 100644
--- a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c
@@ -8282,13 +8282,21 @@ static int hclge_init_nic_client_instance(struct hnae3_ae_dev *ae_dev,
 {
 	struct hnae3_client *client = vport->nic.client;
 	struct hclge_dev *hdev = ae_dev->priv;
+	int rst_cnt;
 	int ret;
 
+	rst_cnt = hdev->rst_stats.reset_cnt;
 	ret = client->ops->init_instance(&vport->nic);
 	if (ret)
 		return ret;
 
 	set_bit(HCLGE_STATE_NIC_REGISTERED, &hdev->state);
+	if (test_bit(HCLGE_STATE_RST_HANDLING, &hdev->state) ||
+	    rst_cnt != hdev->rst_stats.reset_cnt) {
+		ret = -EBUSY;
+		goto init_nic_err;
+	}
+
 	hnae3_set_client_init_flag(client, ae_dev, 1);
 
 	/* Enable nic hw error interrupts */
@@ -8301,6 +8309,15 @@ static int hclge_init_nic_client_instance(struct hnae3_ae_dev *ae_dev,
 		hclge_info_show(hdev);
 
 	return ret;
+
+init_nic_err:
+	clear_bit(HCLGE_STATE_NIC_REGISTERED, &hdev->state);
+	while (test_bit(HCLGE_STATE_RST_HANDLING, &hdev->state))
+		msleep(HCLGE_WAIT_RESET_DONE);
+
+	client->ops->uninit_instance(&vport->nic, 0);
+
+	return ret;
 }
 
 static int hclge_init_roce_client_instance(struct hnae3_ae_dev *ae_dev,
@@ -8308,6 +8325,7 @@ static int hclge_init_roce_client_instance(struct hnae3_ae_dev *ae_dev,
 {
 	struct hnae3_client *client = vport->roce.client;
 	struct hclge_dev *hdev = ae_dev->priv;
+	int rst_cnt;
 	int ret;
 
 	if (!hnae3_dev_roce_supported(hdev) || !hdev->roce_client ||
@@ -8319,14 +8337,30 @@ static int hclge_init_roce_client_instance(struct hnae3_ae_dev *ae_dev,
 	if (ret)
 		return ret;
 
+	rst_cnt = hdev->rst_stats.reset_cnt;
 	ret = client->ops->init_instance(&vport->roce);
 	if (ret)
 		return ret;
 
 	set_bit(HCLGE_STATE_ROCE_REGISTERED, &hdev->state);
+	if (test_bit(HCLGE_STATE_RST_HANDLING, &hdev->state) ||
+	    rst_cnt != hdev->rst_stats.reset_cnt) {
+		ret = -EBUSY;
+		goto init_roce_err;
+	}
+
 	hnae3_set_client_init_flag(client, ae_dev, 1);
 
 	return 0;
+
+init_roce_err:
+	clear_bit(HCLGE_STATE_ROCE_REGISTERED, &hdev->state);
+	while (test_bit(HCLGE_STATE_RST_HANDLING, &hdev->state))
+		msleep(HCLGE_WAIT_RESET_DONE);
+
+	hdev->roce_client->ops->uninit_instance(&vport->roce, 0);
+
+	return ret;
 }
 
 static int hclge_init_client_instance(struct hnae3_client *client,
@@ -8398,6 +8432,9 @@ static void hclge_uninit_client_instance(struct hnae3_client *client,
 		vport = &hdev->vport[i];
 		if (hdev->roce_client) {
 			clear_bit(HCLGE_STATE_ROCE_REGISTERED, &hdev->state);
+			while (test_bit(HCLGE_STATE_RST_HANDLING, &hdev->state))
+				msleep(HCLGE_WAIT_RESET_DONE);
+
 			hdev->roce_client->ops->uninit_instance(&vport->roce,
 								0);
 			hdev->roce_client = NULL;
@@ -8407,6 +8444,9 @@ static void hclge_uninit_client_instance(struct hnae3_client *client,
 			return;
 		if (hdev->nic_client && client->ops->uninit_instance) {
 			clear_bit(HCLGE_STATE_NIC_REGISTERED, &hdev->state);
+			while (test_bit(HCLGE_STATE_RST_HANDLING, &hdev->state))
+				msleep(HCLGE_WAIT_RESET_DONE);
+
 			client->ops->uninit_instance(&vport->nic, 0);
 			hdev->nic_client = NULL;
 			vport->nic.client = NULL;
diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.h b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.h
index 8c4e47a..6a12285 100644
--- a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.h
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.h
@@ -700,6 +700,7 @@ struct hclge_mac_tnl_stats {
 };
 
 #define HCLGE_RESET_INTERVAL	(10 * HZ)
+#define HCLGE_WAIT_RESET_DONE	100
 
 #pragma pack(1)
 struct hclge_vf_vlan_cfg {
-- 
2.7.4


  parent reply	other threads:[~2019-06-20  8:55 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-06-20  8:52 [PATCH net-next 00/11] net: hns3: some code optimizations & bugfixes Huazhong Tan
2019-06-20  8:52 ` [PATCH net-next 01/11] net: hns3: fix selftest fail issue for fibre port with autoneg on Huazhong Tan
2019-06-20  8:52 ` [PATCH net-next 02/11] net: hns3: remove VF VLAN filter entry inexistent warning print Huazhong Tan
2019-06-20  8:52 ` [PATCH net-next 03/11] net: hns3: sync VLAN filter entries when kill VLAN ID failed Huazhong Tan
2019-06-20  8:52 ` [PATCH net-next 04/11] net: hns3: restore the MAC autoneg state after reset Huazhong Tan
2019-06-20  8:52 ` [PATCH net-next 05/11] net: hns3: code optimizaition of hclge_handle_hw_ras_error() Huazhong Tan
2019-06-20  8:52 ` [PATCH net-next 06/11] net: hns3: modify handling of out of memory in hclge_err.c Huazhong Tan
2019-06-20  8:52 ` [PATCH net-next 07/11] net: hns3: remove override_pci_need_reset Huazhong Tan
2019-06-20  8:52 ` [PATCH net-next 08/11] net: hns3: add check to number of buffer descriptors Huazhong Tan
2019-06-20  8:52 ` Huazhong Tan [this message]
2019-06-20  8:52 ` [PATCH net-next 10/11] net: hns3: fixes wrong place enabling ROCE HW error when loading Huazhong Tan
2019-06-20  8:52 ` [PATCH net-next 11/11] net: hns3: add exception handling when enable NIC HW error interrupts Huazhong Tan
2019-06-22 13:53 ` [PATCH net-next 00/11] net: hns3: some code optimizations & bugfixes David Miller
2019-06-26  7:44   ` tanhuazhong
2019-06-26 15:59     ` David Miller
2019-06-27  1:18       ` tanhuazhong

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