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RDMA/ib_srp: Fix a deadlock

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[ Upstream commit 081bdc9fe05bb23248f5effb6f811da3da4b8252 ]

Remove the flush_workqueue(system_long_wq) call since flushing
system_long_wq is deadlock-prone and since that call is redundant with a
preceding cancel_work_sync()

Link: https://lore.kernel.org/r/20220215210511.28303-3-bvanassche@acm.org
Fixes: ef6c49d87c ("IB/srp: Eliminate state SRP_TARGET_DEAD")
Reported-by: syzbot+831661966588c802aae9@syzkaller.appspotmail.com
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Reviewed-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Bart Van Assche 2022-02-15 13:05:11 -08:00 committed by Greg Kroah-Hartman
parent b7e2b91fcb
commit 901206f71e
1 changed files with 4 additions and 2 deletions
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6
drivers/infiniband/ulp/srp/ib_srp.c
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@ -4222,9 +4222,11 @@ static void srp_remove_one(struct ib_device *device, void *client_data)
spin_unlock(&host->target_lock);
/*
* Wait for tl_err and target port removal tasks.
* srp_queue_remove_work() queues a call to
* srp_remove_target(). The latter function cancels
* target->tl_err_work so waiting for the remove works to
* finish is sufficient.
*/
flush_workqueue(system_long_wq);
flush_workqueue(srp_remove_wq);
kfree(host);