linux-kernel - Re: [RFC PATCH 1/5] of: introduce the overlay manager

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Message-ID: <20161026210212.09cd85f4@free-electrons.com>
Date:   Wed, 26 Oct 2016 21:02:12 +0200
From:   Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>
To:     Mathieu Poirier <mathieu.poirier@...aro.org>
Cc:     Antoine Tenart <antoine.tenart@...e-electrons.com>,
        Maxime Ripard <maxime.ripard@...e-electrons.com>,
        pantelis.antoniou@...sulko.com,
        Mark Rutland <mark.rutland@....com>, sboyd@...eaurora.org,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [RFC PATCH 1/5] of: introduce the overlay manager

Hello,

On Wed, 26 Oct 2016 10:29:59 -0600, Mathieu Poirier wrote:

> > +       overlay = devm_kzalloc(dev, sizeof(*overlay), GFP_KERNEL);  
> 
> Function devm_kzalloc() can sleep but you're holding a spinlock - I'm
> surprised the kernel didn't complain here.  Allocate the memory before
> holding the lock.  If the overly is already loaded simply free it on
> the error path.

Actually, I'm not sure using a spinlock here is appropriate. Using a
mutex would probably be better.

Thomas
-- 
Thomas Petazzoni, CTO, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com