This is a note to let you know that I've just added the patch titled
net: hns3: fix a deadlock problem when config TC during resetting
to the 5.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
net-hns3-fix-a-deadlock-problem-when-config-tc-durin.patch
and it can be found in the queue-5.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit b50fa2024d06996a6322738f659000ff8a25ffc1
Author: Jie Wang <wangjie125@xxxxxxxxxx>
Date: Tue Aug 13 22:10:22 2024 +0800
net: hns3: fix a deadlock problem when config TC during resetting
[ Upstream commit be5e816d00a506719e9dbb1a9c861c5ced30a109 ]
When config TC during the reset process, may cause a deadlock, the flow is
as below:
pf reset start
│
▼
......
setup tc │
│ ▼
▼ DOWN: napi_disable()
napi_disable()(skip) │
│ │
▼ ▼
...... ......
│ │
▼ │
napi_enable() │
▼
UINIT: netif_napi_del()
│
▼
......
│
▼
INIT: netif_napi_add()
│
▼
...... global reset start
│ │
▼ ▼
UP: napi_enable()(skip) ......
│ │
▼ ▼
...... napi_disable()
In reset process, the driver will DOWN the port and then UINIT, in this
case, the setup tc process will UP the port before UINIT, so cause the
problem. Adds a DOWN process in UINIT to fix it.
Fixes: bb6b94a896d4 ("net: hns3: Add reset interface implementation in client")
Signed-off-by: Jie Wang <wangjie125@xxxxxxxxxx>
Signed-off-by: Jijie Shao <shaojijie@xxxxxxxxxx>
Signed-off-by: Paolo Abeni <pabeni@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
index d09cc10b3517f..8736e254f098b 100644
--- a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
@@ -4388,6 +4388,9 @@ static int hns3_reset_notify_uninit_enet(struct hnae3_handle *handle)
struct hns3_nic_priv *priv = netdev_priv(netdev);
int ret;
+ if (!test_bit(HNS3_NIC_STATE_DOWN, &priv->state))
+ hns3_nic_net_stop(netdev);
+
if (!test_and_clear_bit(HNS3_NIC_STATE_INITED, &priv->state)) {
netdev_warn(netdev, "already uninitialized\n");
return 0;
