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Subject[PATCH AUTOSEL 5.0 064/317] net: hns3: use atomic_t replace u32 for arq's count
Date
From: Huazhong Tan <tanhuazhong@huawei.com>

[ 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 691d12174902c..3c7a26bb83222 100644
--- a/drivers/net/ethernet/hisilicon/hns3/hclge_mbx.h
+++ b/drivers/net/ethernet/hisilicon/hns3/hclge_mbx.h
@@ -102,7 +102,7 @@ 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 4e78e8812a045..b39ff5555a30e 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 84653f58b2d10..fbba8b83b36c9 100644
--- a/drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_mbx.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_mbx.c
@@ -207,7 +207,8 @@ 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]);
@@ -219,7 +220,7 @@ 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);

@@ -296,7 +297,7 @@ 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
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