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From: Pavel Machek <pavel@ucw.cz>
To: Thomas Tuttle <thinkinginbinary@gmail.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: Problems porting asus_acpi to LED subsystem
Date: Tue, 4 Jul 2006 10:50:22 +0200	[thread overview]
Message-ID: <20060704085022.GB1755@elf.ucw.cz> (raw)
In-Reply-To: <20060703203958.GA8093@phoenix>

Hi!

> Summary:
> 
> I'm trying to link asus_acpi into the LED subsystem.  My set_brightness
> callback evaluates an ACPI method to set the LED state.  It works fine
> manually changing the brightness, but when the callback is called by a
> timer (using the timer or ide-disk triggers), it eventually causes an
> Oops.  I can post my code or the Oops if it would help.  I'm new at
> kernel coding, and I'm not on the list, so please CC me on any reply.
> Sorry if this isn't appropriate on the list.

I _guess_ the LED subsystem can be called from interrupt, and ACPI
does not like that. So you probably need to use workqueue to defer
setting a bit.
								Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

  reply	other threads:[~2006-07-04 10:04 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2006-07-03 20:39 Thomas Tuttle
2006-07-04  8:50 ` Pavel Machek [this message]
     [not found]   ` <20060704145040.GA3611@phoenix>
2006-07-04 18:37     ` Pavel Machek
2006-07-04 22:44   ` Pavel Machek

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