linux-kernel - Re: [RFC] [PATCH 2/2] ACPI: introduce ACPI ALS device driver

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Message-ID: <4AB9D82F.3030706@cam.ac.uk>
Date:	Wed, 23 Sep 2009 09:11:27 +0100
From:	Jonathan Cameron <jic23@....ac.uk>
To:	Zhang Rui <rui.zhang@...el.com>
CC:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-acpi <linux-acpi@...r.kernel.org>,
	Jean Delvare <khali@...ux-fr.org>,
	"alan@...ux.intel.com" <alan@...ux.intel.com>,
	"Cory T. Tusar" <ctusar@...eon-central.com>,
	"Trisal, Kalhan" <kalhan.trisal@...el.com>,
	Len Brown <lenb@...nel.org>, Pavel Machek <pavel@....cz>
Subject: Re: [RFC] [PATCH 2/2] ACPI: introduce ACPI ALS device driver

>> Are there any plausible race conditions associated with doing the allocation this way?
> 
> well, theoretically, yes.
> simultaneous add calls may happen in hotplug case, but I don't think an
> ACPI ALS device supports hotplug.
That would make that point irrelevant!

Thinking further on this. What happens on a box that for some reason repeatedly inserts and
removes this module?

This is the sort of problem idr's are meant to overcome.  They will cost you a bit
in terms of complexity though.

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