Re: [PATCH 2/3] hisi_sas: fix the inconsistent lock issue reported by CONFIG_PROVE_LOCKING

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On 05/31/2016 08:38 PM, John Garry wrote:
It is not necessary to surround call to
notify_port_event(, PORTE_BROADCAST_RCVD) by spin_lock_irqsave(),
so remove.
This was causing a warn, as below:

     =================================
     [ INFO: inconsistent lock state ]
     4.4.8+ #12 Not tainted
     ---------------------------------
     inconsistent {IN-HARDIRQ-W} -> {HARDIRQ-ON-W} usage.
     kworker/u64:1/168 [HC0[0]:SC0[0]:HE1:SE1] takes:
      (&(&hisi_hba->lock)->rlock){?.....}, at: [<ffffffc00052c708>] alloc_dev_quirk_v2_hw+0x48/0xec
     {IN-HARDIRQ-W} state was registered at:
       [<ffffffc0000fc764>] mark_lock+0x19c/0x6a0
       [<ffffffc0000fdc14>] __lock_acquire+0xa2c/0x1d00
       [<ffffffc0000ff654>] lock_acquire+0x58/0x7c
       [<ffffffc0008b609c>] _raw_spin_lock_irqsave+0x54/0x6c
       [<ffffffc00052d3c0>] int_chnl_int_v2_hw+0x1c4/0x248
       [<ffffffc0001098e8>] handle_irq_event_percpu+0x9c/0x144
       [<ffffffc0001099d4>] handle_irq_event+0x44/0x74
       [<ffffffc00010cd68>] handle_fasteoi_irq+0xb4/0x188
       [<ffffffc000108ea8>] generic_handle_irq+0x24/0x38
       [<ffffffc0001091fc>] __handle_domain_irq+0x60/0xac
       [<ffffffc00008261c>] gic_handle_irq+0xcc/0x168
       [<ffffffc0000855ac>] el1_irq+0x6c/0xe0
       [<ffffffc0000f7414>] default_idle_call+0x1c/0x34
       [<ffffffc0000f7654>] cpu_startup_entry+0x1d4/0x228
       [<ffffffc0008aecd8>] rest_init+0x150/0x160
       [<ffffffc000c4b95c>] start_kernel+0x3a4/0x3b8
       [<00000000008bb000>] 0x8bb000
     irq event stamp: 32661
     hardirqs last  enabled at (32661): [<ffffffc0008b41a8>] __mutex_unlock_slowpath+0x108/0x18c
     hardirqs last disabled at (32660): [<ffffffc0008b40e4>] __mutex_unlock_slowpath+0x44/0x18c
     softirqs last  enabled at (25114): [<ffffffc0000bde68>] __do_softirq+0x210/0x27c
     softirqs last disabled at (25095): [<ffffffc0000be224>] irq_exit+0x9c/0xe8

     other info that might help us debug this:
      Possible unsafe locking scenario:

            CPU0
            ----
       lock(&(&hisi_hba->lock)->rlock);
       <Interrupt>
         lock(&(&hisi_hba->lock)->rlock);

      *** DEADLOCK ***

     2 locks held by kworker/u64:1/168:
      #0:  ("%s"shost->work_q_name){++++.+}, at: [<ffffffc0000d2980>] process_one_work+0x134/0x3cc
      #1:  ((&sw->work)#2){+.+.+.}, at: [<ffffffc0000d2980>] process_one_work+0x134/0x3cc

     stack backtrace:
     CPU: 4 PID: 168 Comm: kworker/u64:1 Not tainted 4.4.8+ #12
     Hardware name: Huawei Technologies Co., Ltd. D03/D03, BIOS 1.12 01/01/1900
     Workqueue: scsi_wq_1 sas_discover_domain
     Call trace:
     [<ffffffc000089988>] dump_backtrace+0x0/0x114
     [<ffffffc000089ab0>] show_stack+0x14/0x1c
     [<ffffffc00035ac50>] dump_stack+0xb4/0xf0
     [<ffffffc0000fc524>] print_usage_bug+0x210/0x2b4
     [<ffffffc0000fcbc4>] mark_lock+0x5fc/0x6a0
     [<ffffffc0000fd9e8>] __lock_acquire+0x800/0x1d00
     [<ffffffc0000ff654>] lock_acquire+0x58/0x7c
     [<ffffffc0008b5edc>] _raw_spin_lock+0x44/0x58
     [<ffffffc00052c708>] alloc_dev_quirk_v2_hw+0x48/0xec
     [<ffffffc000528214>] hisi_sas_dev_found+0x48/0x1b8
     [<ffffffc00051a9b8>] sas_notify_lldd_dev_found+0x34/0xe0
     [<ffffffc00051e5e8>] sas_discover_root_expander+0x58/0x128
     [<ffffffc00051b38c>] sas_discover_domain+0x4bc/0x564
     [<ffffffc0000d29ec>] process_one_work+0x1a0/0x3cc
     [<ffffffc0000d2d50>] worker_thread+0x138/0x438
     [<ffffffc0000d9494>] kthread+0xdc/0xf0
     [<ffffffc000085c50>] ret_from_fork+0x10/0x40

Signed-off-by: Wei Xu <xuwei5@xxxxxxxxxxxxx>
Signed-off-by: John Garry <john.garry@xxxxxxxxxx>

Reviewed-by: Zhangfei Gao <zhangfei.gao@xxxxxxxxxx>
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