[Patch V4 net 10/11] net: hns3: bugfix for rtnl_lock's range in the hclge_reset()

[Huazhong Tan]

Since hclge_reset_wait() is used to wait for the hardware to complete
the reset, it is not necessary to hold the rtnl_lock during
hclge_reset_wait(). So this patch releases the lock for the duration
of hclge_reset_wait().

Fixes: 6d4fab39533f ("net: hns3: Reset net device with rtnl_lock")
Signed-off-by: Huazhong Tan <tanhuazh...@huawei.com>
---
 drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c 
b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c
index f3212c9..ffdd960 100644
--- a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c
@@ -2470,14 +2470,17 @@ static void hclge_reset(struct hclge_dev *hdev)
        handle = &hdev->vport[0].nic;
        rtnl_lock();
        hclge_notify_client(hdev, HNAE3_DOWN_CLIENT);
+       rtnl_unlock();
 
        if (!hclge_reset_wait(hdev)) {
+               rtnl_lock();
                hclge_notify_client(hdev, HNAE3_UNINIT_CLIENT);
                hclge_reset_ae_dev(hdev->ae_dev);
                hclge_notify_client(hdev, HNAE3_INIT_CLIENT);
 
                hclge_clear_reset_cause(hdev);
        } else {
+               rtnl_lock();
                /* schedule again to check pending resets later */
                set_bit(hdev->reset_type, &hdev->reset_pending);
                hclge_reset_task_schedule(hdev);
-- 
2.7.4