linux-kernel - Re: [PATCH] Make all it87 drivers SMP safe.

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Message-ID: <20110408132541.39042e95@lxorguk.ukuu.org.uk>
Date:	Fri, 8 Apr 2011 13:25:41 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Nat Gurumoorthy <natg@...gle.com>
Cc:	Jean Delvare <khali@...ux-fr.org>,
	Guenter Roeck <guenter.roeck@...csson.com>,
	Wim Van Sebroeck <wim@...ana.be>,
	Mike Waychison <mikew@...gle.com>, lm-sensors@...sensors.org,
	linux-kernel@...r.kernel.org, linux-watchdog@...r.kernel.org
Subject: Re: [PATCH] Make all it87 drivers SMP safe.

> attempts to serialize access to the hardware by defining a global spinlock
> it87_io_lock in a file it87_lock.c. This lock has to be acquired by each
> of the it87 drivers before it can access the hardware. We have defined

I think this needs a NAK

The resource handler can do this for you and would ensure proper
behaviour.

See
	IORESOURCE_MUXED


Providing the it87 drivers request the resources (which they need to do
anyway!) and use IORESOURCE_MUXED, it should all work ?

Alan
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