linux-kernel - Re: [PATCH v6 07/18] of: dynamic: change type of of_{at,de}tach

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Message-ID: <87tvktqedf.fsf@concordia.ellerman.id.au>
Date:   Wed, 07 Nov 2018 23:08:28 +1100
From:   Michael Ellerman <mpe@...erman.id.au>
To:     frowand.list@...il.com, Rob Herring <robh+dt@...nel.org>,
        Pantelis Antoniou <pantelis.antoniou@...sulko.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Alan Tull <atull@...nel.org>, Moritz Fischer <mdf@...nel.org>
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        devicetree@...r.kernel.org, linux-fpga@...r.kernel.org
Subject: Re: [PATCH v6 07/18] of: dynamic: change type of of_{at,de}tach_node() to void

frowand.list@...il.com writes:

> From: Frank Rowand <frank.rowand@...y.com>
>
> of_attach_node() and of_detach_node() always return zero, so
> their return value is meaningless.

But should they always return zero?

At least __of_attach_node_sysfs() can fail in several ways.

And there's also this in __of_detach_node() which should probably be
returning an error:

	if (WARN_ON(of_node_check_flag(np, OF_DETACHED)))
        	return;


Seems to me we should instead be fixing these to propagate errors,
rather than hiding them?

cheers