linux-kernel - [PATCH net-next 2/8] net: hns3: remove useless mutex vport_cfg_mutex in the struct hclge

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Date:   Thu, 19 Dec 2019 14:57:41 +0800
From:   Huazhong Tan <tanhuazhong@...wei.com>
To:     <davem@...emloft.net>
CC:     <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <salil.mehta@...wei.com>, <yisen.zhuang@...wei.com>,
        <linuxarm@...wei.com>, <jakub.kicinski@...ronome.com>,
        Huazhong Tan <tanhuazhong@...wei.com>
Subject: [PATCH net-next 2/8] net: hns3: remove useless mutex vport_cfg_mutex in the struct hclge_dev

Mutex vport_cfg_mutex has been used to protect uc_mac_list,
mc_mac_list and vlan_list from being modified by unloading
or reset task at the same time. But now unloading will
set up HCLGE_STATE_REMOVING flag and call cancel_work_sync to
break down this race condition, so this mutex is unnecessary.

Signed-off-by: Huazhong Tan <tanhuazhong@...wei.com>
---
 drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c | 9 ---------
 drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.h | 2 --
 drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_mbx.c  | 2 --
 3 files changed, 13 deletions(-)

diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c
index 4e7a078..76b4418 100644
--- a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c
@@ -7534,7 +7534,6 @@ void hclge_uninit_vport_mac_table(struct hclge_dev *hdev)
 	struct hclge_vport *vport;
 	int i;
 
-	mutex_lock(&hdev->vport_cfg_mutex);
 	for (i = 0; i < hdev->num_alloc_vport; i++) {
 		vport = &hdev->vport[i];
 		list_for_each_entry_safe(mac, tmp, &vport->uc_mac_list, node) {
@@ -7547,7 +7546,6 @@ void hclge_uninit_vport_mac_table(struct hclge_dev *hdev)
 			kfree(mac);
 		}
 	}
-	mutex_unlock(&hdev->vport_cfg_mutex);
 }
 
 static int hclge_get_mac_ethertype_cmd_status(struct hclge_dev *hdev,
@@ -8308,7 +8306,6 @@ void hclge_uninit_vport_vlan_table(struct hclge_dev *hdev)
 	struct hclge_vport *vport;
 	int i;
 
-	mutex_lock(&hdev->vport_cfg_mutex);
 	for (i = 0; i < hdev->num_alloc_vport; i++) {
 		vport = &hdev->vport[i];
 		list_for_each_entry_safe(vlan, tmp, &vport->vlan_list, node) {
@@ -8316,7 +8313,6 @@ void hclge_uninit_vport_vlan_table(struct hclge_dev *hdev)
 			kfree(vlan);
 		}
 	}
-	mutex_unlock(&hdev->vport_cfg_mutex);
 }
 
 static void hclge_restore_vlan_table(struct hnae3_handle *handle)
@@ -8328,7 +8324,6 @@ static void hclge_restore_vlan_table(struct hnae3_handle *handle)
 	u16 state, vlan_id;
 	int i;
 
-	mutex_lock(&hdev->vport_cfg_mutex);
 	for (i = 0; i < hdev->num_alloc_vport; i++) {
 		vport = &hdev->vport[i];
 		vlan_proto = vport->port_base_vlan_cfg.vlan_info.vlan_proto;
@@ -8354,8 +8349,6 @@ static void hclge_restore_vlan_table(struct hnae3_handle *handle)
 				break;
 		}
 	}
-
-	mutex_unlock(&hdev->vport_cfg_mutex);
 }
 
 int hclge_en_hw_strip_rxvtag(struct hnae3_handle *handle, bool enable)
@@ -9390,7 +9383,6 @@ static int hclge_init_ae_dev(struct hnae3_ae_dev *ae_dev)
 	hdev->mps = ETH_FRAME_LEN + ETH_FCS_LEN + 2 * VLAN_HLEN;
 
 	mutex_init(&hdev->vport_lock);
-	mutex_init(&hdev->vport_cfg_mutex);
 	spin_lock_init(&hdev->fd_rule_lock);
 
 	ret = hclge_pci_init(hdev);
@@ -9943,7 +9935,6 @@ static void hclge_uninit_ae_dev(struct hnae3_ae_dev *ae_dev)
 	mutex_destroy(&hdev->vport_lock);
 	hclge_uninit_vport_mac_table(hdev);
 	hclge_uninit_vport_vlan_table(hdev);
-	mutex_destroy(&hdev->vport_cfg_mutex);
 	ae_dev->priv = NULL;
 }
 
diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.h b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.h
index 3a91397..4e5cfda 100644
--- a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.h
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.h
@@ -821,8 +821,6 @@ struct hclge_dev {
 	u16 share_umv_size;
 	struct mutex umv_mutex; /* protect share_umv_size */
 
-	struct mutex vport_cfg_mutex;   /* Protect stored vf table */
-
 	DECLARE_KFIFO(mac_tnl_log, struct hclge_mac_tnl_stats,
 		      HCLGE_MAC_TNL_LOG_SIZE);
 
diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_mbx.c b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_mbx.c
index a79d151..f905dd3 100644
--- a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_mbx.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_mbx.c
@@ -797,13 +797,11 @@ void hclge_mbx_handler(struct hclge_dev *hdev)
 			hclge_get_link_mode(vport, req);
 			break;
 		case HCLGE_MBX_GET_VF_FLR_STATUS:
-			mutex_lock(&hdev->vport_cfg_mutex);
 			hclge_rm_vport_all_mac_table(vport, true,
 						     HCLGE_MAC_ADDR_UC);
 			hclge_rm_vport_all_mac_table(vport, true,
 						     HCLGE_MAC_ADDR_MC);
 			hclge_rm_vport_all_vlan_table(vport, true);
-			mutex_unlock(&hdev->vport_cfg_mutex);
 			break;
 		case HCLGE_MBX_GET_MEDIA_TYPE:
 			ret = hclge_get_vf_media_type(vport, req);
-- 
2.7.4