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nvmet-tcp: fix lockdep complaint on nvmet_tcp_wq flush during queue teardown

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[ Upstream commit 533d2e8b4d ]

We probably need nvmet_tcp_wq to have MEM_RECLAIM as we are
sending/receiving for the socket from works on this workqueue.
Also this eliminates lockdep complaints:
--
[ 6174.010200] workqueue: WQ_MEM_RECLAIM
nvmet-wq:nvmet_tcp_release_queue_work [nvmet_tcp] is flushing
!WQ_MEM_RECLAIM nvmet_tcp_wq:nvmet_tcp_io_work [nvmet_tcp]
[ 6174.010216] WARNING: CPU: 20 PID: 14456 at kernel/workqueue.c:2628
check_flush_dependency+0x110/0x14c

Reported-by: Yi Zhang <yi.zhang@redhat.com>
Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Sagi Grimberg
2022-07-24 11:58:43 +03:00
committed by Greg Kroah-Hartman
parent 6d7aabdba6
commit 534e96302a
1 changed files with 2 additions and 1 deletions
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3
drivers/nvme/target/tcp.c
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@@ -1802,7 +1802,8 @@ static int __init nvmet_tcp_init(void)
{
int ret;
nvmet_tcp_wq = alloc_workqueue("nvmet_tcp_wq", WQ_HIGHPRI, 0);
nvmet_tcp_wq = alloc_workqueue("nvmet_tcp_wq",
WQ_MEM_RECLAIM | WQ_HIGHPRI, 0);
if (!nvmet_tcp_wq)
return -ENOMEM;