linux-kernel - Re: [PATCH] Merge the Sonics Silicon Backplane subsystem

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Date:	Sun, 29 Jul 2007 00:45:06 -0400
From:	Dmitry Torokhov <dtor@...ightbb.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Michael Buesch <mb@...sch.de>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	bcm43xx-dev@...ts.berlios.de, netdev@...r.kernel.org,
	linux-wireless@...r.kernel.org,
	Gary Zambrano <zambrano@...adcom.com>
Subject: Re: [PATCH] Merge the Sonics Silicon Backplane subsystem

On Friday 27 July 2007 16:12, Andrew Morton wrote:
> On Fri, 27 Jul 2007 21:43:59 +0200
> Michael Buesch <mb@...sch.de> wrote:
> 
> > > Sure, but why is the locking interruptible rather than plain old
> > > mutex_lock()?
> > 
> > Hm, well. We hold this mutex for several seconds, as writing takes
> > this long. So I simply thought it was worth allowing the waiter
> > to interrupt here. If you say that's not an issue, I'll be happy
> > to use mutex_lock() and reduce code complexity in this area.
> 
> So..  is that what the _interruptible() is for?  To allow an impatient user to ^c
> a read?
> 
> If so, that sounds reasonable.  It's worth a comment explaining these decisions
> to future readers, because it is hard to work out this sort of thinking just
> from the bare C code.

I think most of sysfs ->show() and ->store() implementations use
_interruptible() variant to allow user to interrupt and return early.

-- 
Dmitry
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