circular locking warning during suspend

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Hi,

I didn't find this reported, but maybe it has been, I didn't search for
too long. I'm using 3.8.0-rc4 (plus wireless bits), and lockdep is
unhappy. Note that I am booting with "no_console_suspend".

[   73.320586] ======================================================
[   73.320587] [ INFO: possible circular locking dependency detected ]
[   73.320592] 3.8.0-rc4-wl-67484-g04fa847 #106 Tainted: G        W   
[   73.320594] -------------------------------------------------------
[   73.320597] kworker/u:9/2574 is trying to acquire lock:
[   73.320614]  ((fb_notifier_list).rwsem){.+.+.+}, at: [<ffffffff8106f94a>] __blocking_notifier_call_chain+0x5a/0xd0
[   73.320616] 
[   73.320616] but task is already holding lock:
[   73.320627]  (console_lock){+.+.+.}, at: [<ffffffff81323c80>] i915_drm_freeze+0x90/0xe0
[   73.320628] 
[   73.320628] which lock already depends on the new lock.
[   73.320628] 
[   73.320629] 
[   73.320629] the existing dependency chain (in reverse order) is:
[   73.320635] 
[   73.320635] -> #1 (console_lock){+.+.+.}:
[   73.320642]        [<ffffffff810a13e6>] lock_acquire+0x96/0x1e0
[   73.320647]        [<ffffffff8103bda7>] console_lock+0x77/0x80
[   73.320654]        [<ffffffff812e2fda>] register_con_driver+0x3a/0x150
[   73.320660]        [<ffffffff812e4b4f>] take_over_console+0x2f/0x70
[   73.320666]        [<ffffffff81287d53>] fbcon_takeover+0x63/0xc0
[   73.320671]        [<ffffffff8128baa5>] fbcon_event_notify+0x615/0x720
[   73.320677]        [<ffffffff814b56ed>] notifier_call_chain+0x5d/0x110
[   73.320683]        [<ffffffff8106f964>] __blocking_notifier_call_chain+0x74/0xd0
[   73.320689]        [<ffffffff8106f9d6>] blocking_notifier_call_chain+0x16/0x20
[   73.320695]        [<ffffffff8127ce6b>] fb_notifier_call_chain+0x1b/0x20
[   73.320700]        [<ffffffff8127e625>] register_framebuffer+0x1c5/0x300
[   73.320707]        [<ffffffff813021bc>] drm_fb_helper_single_fb_probe+0x1fc/0x330
[   73.320712]        [<ffffffff813024d2>] drm_fb_helper_initial_config+0x1e2/0x250
[   73.320718]        [<ffffffff81374cea>] intel_fbdev_init+0x8a/0xc0
[   73.320724]        [<ffffffff81329527>] i915_driver_load+0xbc7/0xe00
[   73.320730]        [<ffffffff81311bbe>] drm_get_pci_dev+0x18e/0x2d0
[   73.320735]        [<ffffffff8132407b>] i915_pci_probe+0x3b/0x90
[   73.320741]        [<ffffffff8126f036>] pci_device_probe+0xa6/0xf0
[   73.320747]        [<ffffffff8138765c>] driver_probe_device+0x7c/0x240
[   73.320752]        [<ffffffff813878bc>] __driver_attach+0x9c/0xa0
[   73.320757]        [<ffffffff813857d6>] bus_for_each_dev+0x56/0x90
[   73.320762]        [<ffffffff8138711e>] driver_attach+0x1e/0x20
[   73.320767]        [<ffffffff81386cd8>] bus_add_driver+0x1a8/0x270
[   73.320772]        [<ffffffff81387fa8>] driver_register+0x78/0x160
[   73.320777]        [<ffffffff8126de65>] __pci_register_driver+0x65/0x70
[   73.320782]        [<ffffffff81311e17>] drm_pci_init+0x117/0x130
[   73.320789]        [<ffffffff81c81871>] i915_init+0x66/0x68
[   73.320796]        [<ffffffff810002f2>] do_one_initcall+0x122/0x170
[   73.320801]        [<ffffffff8149af8c>] kernel_init+0x13c/0x2b0
[   73.320807]        [<ffffffff814b9d5c>] ret_from_fork+0x7c/0xb0
[   73.320813] 
[   73.320813] -> #0 ((fb_notifier_list).rwsem){.+.+.+}:
[   73.320818]        [<ffffffff810a0c1e>] __lock_acquire+0x1aee/0x1be0
[   73.320823]        [<ffffffff810a13e6>] lock_acquire+0x96/0x1e0
[   73.320829]        [<ffffffff814af21e>] down_read+0x4e/0x98
[   73.320835]        [<ffffffff8106f94a>] __blocking_notifier_call_chain+0x5a/0xd0
[   73.320841]        [<ffffffff8106f9d6>] blocking_notifier_call_chain+0x16/0x20
[   73.320846]        [<ffffffff8127ce6b>] fb_notifier_call_chain+0x1b/0x20
[   73.320851]        [<ffffffff8127d5de>] fb_set_suspend+0x4e/0x60
[   73.320856]        [<ffffffff81374e65>] intel_fbdev_set_suspend+0x25/0x30
[   73.320862]        [<ffffffff81323c8d>] i915_drm_freeze+0x9d/0xe0
[   73.320867]        [<ffffffff813242ea>] i915_pm_suspend+0x4a/0xa0
[   73.320872]        [<ffffffff8126e2b4>] pci_pm_suspend+0x74/0x140
[   73.320878]        [<ffffffff8138f12c>] dpm_run_callback.isra.3+0x3c/0x80
[   73.320883]        [<ffffffff8138f255>] __device_suspend+0xe5/0x200
[   73.320888]        [<ffffffff8138fa1f>] async_suspend+0x1f/0xa0
[   73.320892]        [<ffffffff81070762>] async_run_entry_fn+0x92/0x1c0
[   73.320898]        [<ffffffff81060198>] process_one_work+0x208/0x750
[   73.320903]        [<ffffffff81060ad0>] worker_thread+0x160/0x450
[   73.320909]        [<ffffffff810676b2>] kthread+0xf2/0x100
[   73.320915]        [<ffffffff814b9d5c>] ret_from_fork+0x7c/0xb0
[   73.320917] 
[   73.320917] other info that might help us debug this:
[   73.320917] 
[   73.320918]  Possible unsafe locking scenario:
[   73.320918] 
[   73.320919]        CPU0                    CPU1
[   73.320921]        ----                    ----
[   73.320924]   lock(console_lock);
[   73.320927]                                lock((fb_notifier_list).rwsem);
[   73.320931]                                lock(console_lock);
[   73.320934]   lock((fb_notifier_list).rwsem);
[   73.320935] 
[   73.320935]  *** DEADLOCK ***
[   73.320935] 
[   73.320937] 4 locks held by kworker/u:9/2574:
[   73.320947]  #0:  (events_unbound){.+.+.+}, at: [<ffffffff81060127>] process_one_work+0x197/0x750
[   73.320955]  #1:  ((&entry->work)){+.+.+.}, at: [<ffffffff81060127>] process_one_work+0x197/0x750
[   73.320964]  #2:  (&__lockdep_no_validate__){......}, at: [<ffffffff8138f228>] __device_suspend+0xb8/0x200
[   73.320974]  #3:  (console_lock){+.+.+.}, at: [<ffffffff81323c80>] i915_drm_freeze+0x90/0xe0
[   73.320975] 
[   73.320975] stack backtrace:
[   73.320979] Pid: 2574, comm: kworker/u:9 Tainted: G        W    3.8.0-rc4-wl-67484-g04fa847 #106
[   73.320981] Call Trace:
[   73.320990]  [<ffffffff814a8c8c>] print_circular_bug+0x1fc/0x20e
[   73.320996]  [<ffffffff810a0c1e>] __lock_acquire+0x1aee/0x1be0
[   73.321016]  [<ffffffff810a13e6>] lock_acquire+0x96/0x1e0
[   73.321029]  [<ffffffff814af21e>] down_read+0x4e/0x98
[   73.321041]  [<ffffffff8106f94a>] __blocking_notifier_call_chain+0x5a/0xd0
[   73.321047]  [<ffffffff8106f9d6>] blocking_notifier_call_chain+0x16/0x20
[   73.321053]  [<ffffffff8127ce6b>] fb_notifier_call_chain+0x1b/0x20
[   73.321058]  [<ffffffff8127d5de>] fb_set_suspend+0x4e/0x60
[   73.321063]  [<ffffffff81374e65>] intel_fbdev_set_suspend+0x25/0x30
[   73.321069]  [<ffffffff81323c8d>] i915_drm_freeze+0x9d/0xe0
[   73.321075]  [<ffffffff813242ea>] i915_pm_suspend+0x4a/0xa0
[   73.321080]  [<ffffffff8126e2b4>] pci_pm_suspend+0x74/0x140
[   73.321091]  [<ffffffff8138f12c>] dpm_run_callback.isra.3+0x3c/0x80
[   73.321096]  [<ffffffff8138f255>] __device_suspend+0xe5/0x200
[   73.321102]  [<ffffffff8138fa1f>] async_suspend+0x1f/0xa0
[   73.321107]  [<ffffffff81070762>] async_run_entry_fn+0x92/0x1c0
[   73.321113]  [<ffffffff81060198>] process_one_work+0x208/0x750
[   73.321142]  [<ffffffff81060ad0>] worker_thread+0x160/0x450
[   73.321153]  [<ffffffff810676b2>] kthread+0xf2/0x100
[   73.321173]  [<ffffffff814b9d5c>] ret_from_fork+0x7c/0xb0

johannes



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