linux-kernel - Re: [PATCHv4 4/7] hwspinlock/core: add common OF helpers

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Date:	Fri, 14 Mar 2014 15:12:26 +0200
From:	Ohad Ben-Cohen <ohad@...ery.com>
To:	Bjorn Andersson <bjorn@...o.se>
Cc:	Suman Anna <s-anna@...com>, Mark Rutland <mark.rutland@....com>,
	Tony Lindgren <tony@...mide.com>,
	Kumar Gala <galak@...eaurora.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Grant Likely <grant.likely@...retlab.ca>
Subject: Re: [PATCHv4 4/7] hwspinlock/core: add common OF helpers

On Sun, Mar 2, 2014 at 10:19 PM, Bjorn Andersson <bjorn@...o.se> wrote:
> When introducing the ability to reference a hwspin lock via a phandle
> in device tree it makes a big difference to be able to differ between
> the case of "initialization failed" or "device not yet probed"; so
> that the client knows if it should fail or retry later.

I'm not convinced.

The only advantage this brings is to avoid retrying in case a fatal
error has occurred. Such fatal errors are extremely rare, and when
they show up - extremely painful, and I suspect that optimizing them
wouldn't be a big win.

OTOH, keeping the code easier to read and less error prone is a big
win. I prefer we keep it simple for now.

Thanks,
Ohad.
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