linux-kernel - Re: [PATCH] 1/2 Maple: Update bus driver to allow support of VMU device

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Message-Id: <1206053547.6274.28.camel@localhost.localdomain>
Date:	Thu, 20 Mar 2008 22:52:27 +0000
From:	Adrian McMenamin <adrian@...golddream.dyndns.info>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	dwmw2@...radead.org, greg@...ah.com, lethal@...ux-sh.org,
	linux-kernel@...r.kernel.org, linux-sh@...r.kernel.org,
	linux-mtd@...r.kernel.org
Subject: Re: [PATCH] 1/2 Maple: Update bus driver to allow support of VMU
	device


On Thu, 2008-03-20 at 15:39 -0700, Andrew Morton wrote:
> On Thu, 20 Mar 2008 22:23:17 +0000
> Adrian McMenamin <adrian@...golddream.dyndns.info> wrote:
> 
> > 
> > > urgh, down_trylock().  And a secret, undocumented one too.
> > > 
> > > A trylock is always an exceptional thing.  How is *any* reader of this code
> > > supposed to work out what the heck it's doing there?  Convert it into
> > > down(), run the code and decrypt the lockdep warnings, I suspect.
> > > 
> > > <looks>
> > > 
> > > Nope, I can't see any other lock being held when we call this function.
> > > 
> > > The trylocks are an utter mystery to me.  Please don't write mysterious
> > > code.
> > > 
> > 
> > OK, I am sure this is my problem but I have no idea why you are
> > describing down_trylock as undocumented
> 
> I'm describing your use of it!  I'm sitting here trying to work out why on
> earth this code is using the highly unusual (and highly suspicious) trylock
> idiom and this is far from clear.
> 

OK, I understand your point now. Some comments wouldn't go amiss, for
sure.

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