linux-kernel - Re: 2.6.33-mmotm0304 - lockdep warning in ACPI code

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Date:	Thu, 18 Mar 2010 13:36:58 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Valdis.Kletnieks@...edu
Cc:	Len Brown <lenb@...nel.org>, Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org,
	linux-acpi@...r.kernel.org, Greg KH <greg@...ah.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: 2.6.33-mmotm0304 - lockdep warning in ACPI code

On Tue, 09 Mar 2010 03:46:10 -0500
Valdis.Kletnieks@...edu wrote:

> Seen in my dmesg.  Appears to have started in 2.6.33-rc7-mmotm0210, I can't
> remember if I reported it before or not...
> 
> [    0.212297] ACPI: Using IOAPIC for interrupt routing
> [    0.340075] 
> [    0.340076] =============================================
> [    0.340241] [ INFO: possible recursive locking detected ]
> [    0.340330] 2.6.33-mmotm0304 #5
> [    0.340415] ---------------------------------------------
> [    0.340504] swapper/1 is trying to acquire lock:
> [    0.340591]  (&dev->mutex){+.+...}, at: [<ffffffff812fddfd>] __driver_attach+0x47/0x80
> [    0.340926] 
> [    0.340927] but task is already holding lock:
> [    0.340999]  (&dev->mutex){+.+...}, at: [<ffffffff812fddef>] __driver_attach+0x39/0x80
> [    0.340999] 
> [    0.340999] other info that might help us debug this:
> [    0.340999] 1 lock held by swapper/1:
> [    0.340999]  #0:  (&dev->mutex){+.+...}, at: [<ffffffff812fddef>] __driver_attach+0x39/0x80
> [    0.340999] 
> [    0.340999] stack backtrace:
> [    0.340999] Pid: 1, comm: swapper Not tainted 2.6.33-mmotm0304 #5
> [    0.340999] Call Trace:
> [    0.340999]  [<ffffffff810645e7>] __lock_acquire+0xc74/0xceb
> [    0.340999]  [<ffffffff81062a4f>] ? mark_lock+0x2d/0x22c
> [    0.340999]  [<ffffffff812fddfd>] ? __driver_attach+0x47/0x80
> [    0.340999]  [<ffffffff81064753>] lock_acquire+0xf5/0x112
> [    0.340999]  [<ffffffff812fddfd>] ? __driver_attach+0x47/0x80
> [    0.340999]  [<ffffffff81062ca0>] ? mark_held_locks+0x52/0x70
> [    0.340999]  [<ffffffff81581bb5>] __mutex_lock_common+0x5c/0x5aa
> [    0.340999]  [<ffffffff812fddfd>] ? __driver_attach+0x47/0x80
> [    0.340999]  [<ffffffff81571004>] ? klist_next+0x24/0xd7
> [    0.340999]  [<ffffffff812fddfd>] ? __driver_attach+0x47/0x80
> [    0.340999]  [<ffffffff812fddb6>] ? __driver_attach+0x0/0x80
> [    0.340999]  [<ffffffff815821a9>] mutex_lock_nested+0x34/0x39
> [    0.340999]  [<ffffffff812fddfd>] __driver_attach+0x47/0x80
> [    0.340999]  [<ffffffff812fddb6>] ? __driver_attach+0x0/0x80
> [    0.340999]  [<ffffffff812fddb6>] ? __driver_attach+0x0/0x80
> [    0.340999]  [<ffffffff812fd31f>] bus_for_each_dev+0x54/0x89
> [    0.340999]  [<ffffffff812fdb66>] driver_attach+0x19/0x1b
> [    0.340999]  [<ffffffff812fd7b1>] bus_add_driver+0xb4/0x203
> [    0.340999]  [<ffffffff812fe10f>] driver_register+0xb8/0x129
> [    0.340999]  [<ffffffff8123af12>] acpi_bus_register_driver+0x3e/0x40
> [    0.340999]  [<ffffffff81b4aaa4>] acpi_ec_init+0x37/0x55
> [    0.340999]  [<ffffffff81b4a920>] acpi_init+0x101/0x116
> [    0.340999]  [<ffffffff81b4a81f>] ? acpi_init+0x0/0x116
> [    0.340999]  [<ffffffff810001ef>] do_one_initcall+0x59/0x14e
> [    0.340999]  [<ffffffff81b2c687>] kernel_init+0x14d/0x1d7
> [    0.340999]  [<ffffffff810033d4>] kernel_thread_helper+0x4/0x10
> [    0.340999]  [<ffffffff81584040>] ? restore_args+0x0/0x30
> [    0.340999]  [<ffffffff81b2c53a>] ? kernel_init+0x0/0x1d7
> [    0.340999]  [<ffffffff810033d0>] ? kernel_thread_helper+0x0/0x10
> [    0.341046] ACPI: EC: GPE = 0x11, I/O: command/status = 0x934, data = 0x930
> 

<looks at mainline's 8e9394ce2412254ec69fd2a4f3e44a66eade2297>

    In the future, we are going to be changing the lock type for struct
    device (once we get the lockdep infrastructure properly worked out)

<looks at linux-next's "drivers/base: Convert dev->sem to mutex">

Seems that the latter patch (from Greg and Thomas) went and did the
mutex conversion before "we got the lockdep infrastructure properly
worked out".

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