linux-kernel - Re: [PATCH] use spinlock instead of binary mutex in CDU-31A driver

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Date:	Mon, 23 Apr 2007 07:42:14 +0200
From:	Matthias Kaehlcke <matthias.kaehlcke@...il.com>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	emoenke@...g.de, minyard@...rch.cirr.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] use spinlock instead of binary mutex in CDU-31A driver

El Mon, Apr 23, 2007 at 01:25:58AM +0200 Andi Kleen ha dit:

> Matthias Kaehlcke <matthias.kaehlcke@...il.com> writes:
> 
> > -static DECLARE_MUTEX(sony_sem);		/* Semaphore for drive hardware access */
> > +static DEFINE_MUTEX(sony_mtx);		/* Mutex for drive hardware access */
> 
> That's not a spinlock.  Also normally some rationale is added to the
> description for a change?

sorry i messed up the description of the change, i meant mutex instead
of spinlock (in the last days i reported some spinlock related bugs
...). 

the rationale is that according to http://lwn.net/Articles/167034/
binary semaphores that aren't given in interrupt context or
locked and unlocked by different processes should be replaced by
mutexes

thanks for your comments

-- 
Matthias Kaehlcke
Linux Application Developer
Barcelona

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