From: zhenwei pi pizhenwei@bytedance.com
[ Upstream commit 85bd23f3dc09a2ae9e56885420e52c54bf983713 ]
When connecting a controller with a zero kato value using the following command line
nvme connect -t tcp -n NQN -a ADDR -s PORT --keep-alive-tmo=0
the warning below can be reproduced:
WARNING: CPU: 1 PID: 241 at kernel/workqueue.c:1627 __queue_delayed_work+0x6d/0x90 with trace: mod_delayed_work_on+0x59/0x90 nvmet_update_cc+0xee/0x100 [nvmet] nvmet_execute_prop_set+0x72/0x80 [nvmet] nvmet_tcp_try_recv_pdu+0x2f7/0x770 [nvmet_tcp] nvmet_tcp_io_work+0x63f/0xb2d [nvmet_tcp] ...
This is caused by queuing up an uninitialized work. Althrough the keep-alive timer is disabled during allocating the controller (fixed in 0d3b6a8d213a), ka_work still has a chance to run (called by nvmet_start_ctrl).
Fixes: 0d3b6a8d213a ("nvmet: Disable keep-alive timer when kato is cleared to 0h") Signed-off-by: zhenwei pi pizhenwei@bytedance.com Signed-off-by: Christoph Hellwig hch@lst.de Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/nvme/target/core.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/nvme/target/core.c b/drivers/nvme/target/core.c index 63b87a8472762..4b58f352c0c93 100644 --- a/drivers/nvme/target/core.c +++ b/drivers/nvme/target/core.c @@ -591,7 +591,8 @@ static void nvmet_start_ctrl(struct nvmet_ctrl *ctrl) * in case a host died before it enabled the controller. Hence, simply * reset the keep alive timer when the controller is enabled. */ - mod_delayed_work(system_wq, &ctrl->ka_work, ctrl->kato * HZ); + if (ctrl->kato) + mod_delayed_work(system_wq, &ctrl->ka_work, ctrl->kato * HZ); }
static void nvmet_clear_ctrl(struct nvmet_ctrl *ctrl)