| From bfa161e45f392e6a780dd066cfbc2d56ded51b4f Mon Sep 17 00:00:00 2001 |
| From: Huazhong Tan <tanhuazhong@huawei.com> |
| Date: Thu, 25 Apr 2019 20:42:49 +0800 |
| Subject: net: hns3: use atomic_t replace u32 for arq's count |
| |
| [ Upstream commit 30780a8b1677e7409b32ae52a9a84f7d41ae6b43 ] |
| |
| Since irq handler and mailbox task will both update arq's count, |
| so arq's count should use atomic_t instead of u32, otherwise |
| its value may go wrong finally. |
| |
| Fixes: 07a0556a3a73 ("net: hns3: Changes to support ARQ(Asynchronous Receive Queue)") |
| Signed-off-by: Huazhong Tan <tanhuazhong@huawei.com> |
| Signed-off-by: Peng Li <lipeng321@huawei.com> |
| Signed-off-by: David S. Miller <davem@davemloft.net> |
| Signed-off-by: Sasha Levin <sashal@kernel.org> |
| --- |
| drivers/net/ethernet/hisilicon/hns3/hclge_mbx.h | 2 +- |
| drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_cmd.c | 2 +- |
| drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_mbx.c | 7 ++++--- |
| 3 files changed, 6 insertions(+), 5 deletions(-) |
| |
| diff --git a/drivers/net/ethernet/hisilicon/hns3/hclge_mbx.h b/drivers/net/ethernet/hisilicon/hns3/hclge_mbx.h |
| index 299b277bc7ae9..589b7ee32bff8 100644 |
| --- a/drivers/net/ethernet/hisilicon/hns3/hclge_mbx.h |
| +++ b/drivers/net/ethernet/hisilicon/hns3/hclge_mbx.h |
| @@ -107,7 +107,7 @@ struct hclgevf_mbx_arq_ring { |
| struct hclgevf_dev *hdev; |
| u32 head; |
| u32 tail; |
| - u32 count; |
| + atomic_t count; |
| u16 msg_q[HCLGE_MBX_MAX_ARQ_MSG_NUM][HCLGE_MBX_MAX_ARQ_MSG_SIZE]; |
| }; |
| |
| diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_cmd.c b/drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_cmd.c |
| index 9441b453d38df..9a0a501908aec 100644 |
| --- a/drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_cmd.c |
| +++ b/drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_cmd.c |
| @@ -327,7 +327,7 @@ int hclgevf_cmd_init(struct hclgevf_dev *hdev) |
| hdev->arq.hdev = hdev; |
| hdev->arq.head = 0; |
| hdev->arq.tail = 0; |
| - hdev->arq.count = 0; |
| + atomic_set(&hdev->arq.count, 0); |
| hdev->hw.cmq.csq.next_to_clean = 0; |
| hdev->hw.cmq.csq.next_to_use = 0; |
| hdev->hw.cmq.crq.next_to_clean = 0; |
| diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_mbx.c b/drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_mbx.c |
| index 7dc3c9f79169f..4f2c77283cb43 100644 |
| --- a/drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_mbx.c |
| +++ b/drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_mbx.c |
| @@ -208,7 +208,8 @@ void hclgevf_mbx_handler(struct hclgevf_dev *hdev) |
| /* we will drop the async msg if we find ARQ as full |
| * and continue with next message |
| */ |
| - if (hdev->arq.count >= HCLGE_MBX_MAX_ARQ_MSG_NUM) { |
| + if (atomic_read(&hdev->arq.count) >= |
| + HCLGE_MBX_MAX_ARQ_MSG_NUM) { |
| dev_warn(&hdev->pdev->dev, |
| "Async Q full, dropping msg(%d)\n", |
| req->msg[1]); |
| @@ -220,7 +221,7 @@ void hclgevf_mbx_handler(struct hclgevf_dev *hdev) |
| memcpy(&msg_q[0], req->msg, |
| HCLGE_MBX_MAX_ARQ_MSG_SIZE * sizeof(u16)); |
| hclge_mbx_tail_ptr_move_arq(hdev->arq); |
| - hdev->arq.count++; |
| + atomic_inc(&hdev->arq.count); |
| |
| hclgevf_mbx_task_schedule(hdev); |
| |
| @@ -308,7 +309,7 @@ void hclgevf_mbx_async_handler(struct hclgevf_dev *hdev) |
| } |
| |
| hclge_mbx_head_ptr_move_arq(hdev->arq); |
| - hdev->arq.count--; |
| + atomic_dec(&hdev->arq.count); |
| msg_q = hdev->arq.msg_q[hdev->arq.head]; |
| } |
| } |
| -- |
| 2.20.1 |
| |