linux-kernel - Re: powermac: Call of_node_put(bk_node) only once in pmac_has_backlight

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Message-ID: <f5bfdc01-05b1-4015-8fbe-d84417b69138@web.de>
Date: Mon, 7 Oct 2024 09:15:51 +0200
From: Markus Elfring <Markus.Elfring@....de>
To: Dan Carpenter <dan.carpenter@...aro.org>,
 Christophe Leroy <christophe.leroy@...roup.eu>,
 linuxppc-dev@...ts.ozlabs.org, linux-doc@...r.kernel.org
Cc: Jani Nikula <jani.nikula@...el.com>,
 Madhavan Srinivasan <maddy@...ux.ibm.com>,
 Michael Ellerman <mpe@...erman.id.au>, Naveen N Rao <naveen@...nel.org>,
 Nicholas Piggin <npiggin@...il.com>, Paul Mackerras <paulus@...ba.org>,
 Stephen Rothwell <sfr@...b.auug.org.au>,
 Thomas Zimmermann <tzimmermann@...e.de>, LKML
 <linux-kernel@...r.kernel.org>, kernel-janitors@...r.kernel.org,
 Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Subject: Re: powermac: Call of_node_put(bk_node) only once in
 pmac_has_backlight_type()

> First of all, the change is wrong.  We can't dereference "prop" after calling
> of_node_put().
…
> The of_get_property() function doesn't do a get as in get/put, it just finds
> the property and returns it.  It doesn't bump the reference count.  It's a
> confusing name in that way.  The The of_node_put() pairs with
> of_find_node_by_name().
Thanks for your information.

* Do you see opportunities for improving the software documentation accordingly?

* How much can source code analysis tools influence development efforts?


Regards,
Markus