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scsi: iscsi: Use system_unbound_wq for destroy_work

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Use the system_unbound_wq for async session destruction. We don't need a
dedicated workqueue for async session destruction because:

 1. perf does not seem to be an issue since we only allow 1 active work.

 2. it does not have deps with other system works and we can run them in
    parallel with each other.

Link: https://lore.kernel.org/r/20210525181821.7617-6-michael.christie@oracle.com
Reviewed-by: Lee Duncan <lduncan@suse.com>
Signed-off-by: Mike Christie <michael.christie@oracle.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Mike Christie 2021-05-25 13:17:58 -05:00 committed by Martin K. Petersen
parent 06c203a556
commit b25b957d2d
1 changed files with 1 additions and 14 deletions
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15
drivers/scsi/scsi_transport_iscsi.c
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@ -95,8 +95,6 @@ static DECLARE_WORK(stop_conn_work, stop_conn_work_fn);
static atomic_t iscsi_session_nr; /* sysfs session id for next new session */
static struct workqueue_struct *iscsi_eh_timer_workq;
static struct workqueue_struct *iscsi_destroy_workq;
static DEFINE_IDA(iscsi_sess_ida);
/*
* list of registered transports and lock that must
@ -3724,7 +3722,7 @@ iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, uint32_t *group)
list_del_init(&session->sess_list);
spin_unlock_irqrestore(&sesslock, flags);
queue_work(iscsi_destroy_workq, &session->destroy_work);
queue_work(system_unbound_wq, &session->destroy_work);
}
break;
case ISCSI_UEVENT_UNBIND_SESSION:
@ -4820,18 +4818,8 @@ static __init int iscsi_transport_init(void)
goto release_nls;
}
iscsi_destroy_workq = alloc_workqueue("%s",
WQ_SYSFS | __WQ_LEGACY | WQ_MEM_RECLAIM | WQ_UNBOUND,
1, "iscsi_destroy");
if (!iscsi_destroy_workq) {
err = -ENOMEM;
goto destroy_wq;
}
return 0;
destroy_wq:
destroy_workqueue(iscsi_eh_timer_workq);
release_nls:
netlink_kernel_release(nls);
unregister_flashnode_bus:
@ -4853,7 +4841,6 @@ unregister_transport_class:
static void __exit iscsi_transport_exit(void)
{
destroy_workqueue(iscsi_destroy_workq);
destroy_workqueue(iscsi_eh_timer_workq);
netlink_kernel_release(nls);
bus_unregister(&iscsi_flashnode_bus);