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Date: Fri, 27 Sep 2002 18:24:07 -0700
From: Andrew Morton <akpm@digeo.com>
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To: Luc Van Oostenryck <luc.vanoostenryck@easynet.be>,
       Greg KH <greg@kroah.com>, Thomas Molina <tmolina@cox.net>
CC: Kernel mailing list <linux-kernel@vger.kernel.org>
Subject: Re: (more) Sleeping function called from illegal context...
References: <20020927233044.GA14234@kroah.com> <3D94EEBF.D6328392@digeo.com> <3D94FB57.40507@easynet.be>
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Luc Van Oostenryck wrote:
> 
> With CONFIG_PREEMPT=y on an SMP AMD (2CPU):
> 
> Sleeping function called from illegal context at /kernel/l-2.5.39/include/asm/semaphore.h:119
> c1b4ff7c c0117094 c0280b00 c02bc680 00000077 f7f78540 c01ffc8c c02bc680
>         00000077 c1b4e000 c1b4e000 00000001 c1b4ffdc c1b4ffc0 00000206 f7f78568
>         c1b4e000 00000001 c1b4ffdc c01fff35 c01fff00 00000000 00000000 00000000
> Call Trace:
>   [<c0117094>]__might_sleep+0x54/0x58
>   [<c01ffc8c>]usb_hub_events+0x6c/0x2e0
>   [<c01fff35>]usb_hub_thread+0x35/0xe0
>   [<c01fff00>]usb_hub_thread+0x0/0xe0
>   [<c0115500>]default_wake_function+0x0/0x40
>   [<c010553d>]kernel_thread_helper+0x5/0x18

usb_hub_events() does down() inside hub_event_lock.
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