linux-kernel - Re: [PATCH v2 1/4] gpio-langwell: initialize lock before usage

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Message-ID: <20130522075826.GU11878@intel.com>
Date:	Wed, 22 May 2013 10:58:26 +0300
From:	Mika Westerberg <mika.westerberg@...ux.intel.com>
To:	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:	Linus Walleij <linus.walleij@...aro.org>,
	David Cohen <david.a.cohen@...el.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/4] gpio-langwell: initialize lock before usage

On Wed, May 22, 2013 at 10:47:36AM +0300, Andy Shevchenko wrote:
> Otherwise we will end up with traceback from LOCKDEP:
> 
> INFO: trying to register non-static key.
> the code is fine but needs lockdep annotation.
> turning off the locking correctness validator.
> CPU: 0 PID: 1 Comm: swapper/0 Not tainted 3.10.0-rc2-next-20130521-00028-g09aa9fc #487
>  00000000 00000000 f6c55c54 c1541fe4 f6040bf8 f6c55c8c c1069ef1 c1726bc1
>  c1726cc8 c1726c9e 00000000 f6c584e0 f6c58000 f6c55ce8 00000000 f6040bf8
>  f6040bf8 00000046 f6c58000 f6c55d00 c106a18d 00000a2b 00000003 00004f02
> Call Trace:
>  [<c1541fe4>] dump_stack+0x49/0x77
>  [<c1069ef1>] register_lock_class+0x58/0x260
>  [<c106a18d>] __lock_acquire+0x94/0xcff
>  [<c106adc8>] ? __lock_acquire+0xccf/0xcff
>  [<c106b2ad>] lock_acquire+0xcc/0x10d
>  [<c1269c7c>] ? lnw_irq_type+0x63/0xe9
>  [<c1545da0>] _raw_spin_lock_irqsave+0x32/0x42
>  [<c1269c7c>] ? lnw_irq_type+0x63/0xe9
>  [<c1269c7c>] lnw_irq_type+0x63/0xe9
>  [<c108f454>] __irq_set_trigger+0x98/0x123
>  [<c1090225>] irq_set_irq_type+0x2f/0x51
>  [<c1090225>] ? irq_set_irq_type+0x2f/0x51
>  [<c1269d02>] ? lnw_irq_type+0xe9/0xe9
>  [<c1269d34>] lnw_gpio_irq_map+0x32/0x3b
>  [<c10914f2>] irq_domain_add_legacy+0xe2/0x107
>  [<c1091b53>] irq_domain_add_simple+0x47/0x60
>  [<c1269f6e>] lnw_gpio_probe+0x119/0x217
>  [<c1271018>] pci_device_probe+0x5a/0x92
> ...
> 
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>

Acked-by: Mika Westerberg <mika.westerberg@...ux.intel.com>
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