linux-kernel - Re: [PATCH] of/irq: add missing of_node

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Date:   Wed, 18 Jan 2023 10:23:17 -0600
From:   Rob Herring <robh@...nel.org>
To:     Clément Léger <clement.leger@...tlin.com>
Cc:     linux-kernel@...r.kernel.org,
        Frank Rowand <frowand.list@...il.com>,
        Rob Herring <robh+dt@...nel.org>, devicetree@...r.kernel.org
Subject: Re: [PATCH] of/irq: add missing of_node_put() for interrupt parent
 node


On Tue, 17 Jan 2023 15:49:29 +0100, Clément Léger wrote:
> After calling of_irq_parse_one(), the node provided in the of_phandle_args
> has a refcount increment by one. Add missing of_node_put in of_irq_get()
> to decrement the refcount once used.
> 
> Signed-off-by: Clément Léger <clement.leger@...tlin.com>
> ---
> 
> While debugging a refcount problem with OF_DYNAMIC enabled (which is
> actually the only case were node refcount are really used), I noticed that
> platform_get_irq() was actually incrementing the refcount of an interrupt
> controller node. Digging into that function shows that it calls
> of_irq_get() which calls of_irq_parse_one() and finally of_irq_parse_raw().
> Since it seems sane that the node returned in the of_phandle_args has a
> refcount incremented, I thought it is better to put the of_node_put() in
> the user even though it was hard to find any user doing so.
> 
>  drivers/of/irq.c | 12 +++++++++---
>  1 file changed, 9 insertions(+), 3 deletions(-)
> 

Applied, thanks!