block: blk-mq: use swait
| BUG: sleeping function called from invalid context at kernel/locking/rtmutex.c:914
| in_atomic(): 1, irqs_disabled(): 0, pid: 255, name: kworker/u257:6
| 5 locks held by kworker/u257:6/255:
| #0: ("events_unbound"){.+.+.+}, at: [<
ffffffff8108edf1>] process_one_work+0x171/0x5e0
| #1: ((&entry->work)){+.+.+.}, at: [<
ffffffff8108edf1>] process_one_work+0x171/0x5e0
| #2: (&shost->scan_mutex){+.+.+.}, at: [<
ffffffffa000faa3>] __scsi_add_device+0xa3/0x130 [scsi_mod]
| #3: (&set->tag_list_lock){+.+...}, at: [<
ffffffff812f09fa>] blk_mq_init_queue+0x96a/0xa50
| #4: (rcu_read_lock_sched){......}, at: [<
ffffffff8132887d>] percpu_ref_kill_and_confirm+0x1d/0x120
| Preemption disabled at:[<
ffffffff812eff76>] blk_mq_freeze_queue_start+0x56/0x70
|
| CPU: 2 PID: 255 Comm: kworker/u257:6 Not tainted 3.18.7-rt0+ #1
| Workqueue: events_unbound async_run_entry_fn
|
0000000000000003 ffff8800bc29f998 ffffffff815b3a12 0000000000000000
|
0000000000000000 ffff8800bc29f9b8 ffffffff8109aa16 ffff8800bc29fa28
|
ffff8800bc5d1bc8 ffff8800bc29f9e8 ffffffff815b8dd4 ffff880000000000
| Call Trace:
| [<
ffffffff815b3a12>] dump_stack+0x4f/0x7c
| [<
ffffffff8109aa16>] __might_sleep+0x116/0x190
| [<
ffffffff815b8dd4>] rt_spin_lock+0x24/0x60
| [<
ffffffff810b6089>] __wake_up+0x29/0x60
| [<
ffffffff812ee06e>] blk_mq_usage_counter_release+0x1e/0x20
| [<
ffffffff81328966>] percpu_ref_kill_and_confirm+0x106/0x120
| [<
ffffffff812eff76>] blk_mq_freeze_queue_start+0x56/0x70
| [<
ffffffff812f0000>] blk_mq_update_tag_set_depth+0x40/0xd0
| [<
ffffffff812f0a1c>] blk_mq_init_queue+0x98c/0xa50
| [<
ffffffffa000dcf0>] scsi_mq_alloc_queue+0x20/0x60 [scsi_mod]
| [<
ffffffffa000ea35>] scsi_alloc_sdev+0x2f5/0x370 [scsi_mod]
| [<
ffffffffa000f494>] scsi_probe_and_add_lun+0x9e4/0xdd0 [scsi_mod]
| [<
ffffffffa000fb26>] __scsi_add_device+0x126/0x130 [scsi_mod]
| [<
ffffffffa013033f>] ata_scsi_scan_host+0xaf/0x200 [libata]
| [<
ffffffffa012b5b6>] async_port_probe+0x46/0x60 [libata]
| [<
ffffffff810978fb>] async_run_entry_fn+0x3b/0xf0
| [<
ffffffff8108ee81>] process_one_work+0x201/0x5e0
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>