linux-kernel - Re: [PATCH 06/13] ACPI/IPMI: Add reference counting for ACPI operation region handlers

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Message-ID: <2501577.sf07PMEtR1@vostro.rjw.lan>
Date:	Thu, 25 Jul 2013 23:29:13 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Lv Zheng <lv.zheng@...el.com>
Cc:	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	Len Brown <len.brown@...el.com>, linux-kernel@...r.kernel.org,
	linux-acpi@...r.kernel.org
Subject: Re: [PATCH 06/13] ACPI/IPMI: Add reference counting for ACPI operation region handlers

On Tuesday, July 23, 2013 04:09:43 PM Lv Zheng wrote:
> This patch adds reference couting for ACPI operation region handlers to fix
> races caused by the ACPICA address space callback invocations.
> 
> ACPICA address space callback invocation is not suitable for Linux
> CONFIG_MODULE=y execution environment.

Actually, can you please explain to me what *exactly* the problem is?

Rafael

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