linux-kernel - Re: [PATCH v3 1/4] remoteproc: introduce rproc_get_by

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Message-ID: <CAK=WgbZCqnMPEnU2992gkOp07BaCP5NJNRO-hLCAdOtUXZGRnQ@mail.gmail.com>
Date:	Sat, 9 May 2015 10:39:14 +0300
From:	Ohad Ben-Cohen <ohad@...ery.com>
To:	Dave Gerlach <d-gerlach@...com>
Cc:	linux-arm <linux-arm-kernel@...ts.infradead.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>,
	Suman Anna <s-anna@...com>, Kevin Hilman <khilman@...aro.org>,
	Tony Lindgren <tony@...mide.com>
Subject: Re: [PATCH v3 1/4] remoteproc: introduce rproc_get_by_phandle API

Hi Dave,

On Wed, Apr 1, 2015 at 10:37 PM, Dave Gerlach <d-gerlach@...com> wrote:
> Allow users of remoteproc the ability to get a handle to an rproc by
> passing a phandle supplied in the user's device tree node. This is
> useful in situations that require manual booting of the rproc.
>
> This patch uses the code removed by commit 40e575b1d0b3 ("remoteproc:
> remove the get_by_name/put API") for the ref counting a rproc klist
> code but has rproc_get_by_name replaced with an rproc_get_by_phandle API.

The general idea makes sense to me, but I'm not sure we really do need
a klist here, since the usage profile of this list is expected to be
super simple: very small number of accessors, looking for small number
of list members a small number of times, and probably never do need to
modify the list while accessing it.

I suspect that the code would be simpler to maintain, debug and
understand if we just use a simple list with a simple locking
methodology here.

Thanks,
Ohad.
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