linux-kernel - RE: [PATCH 2/2] clk: renesas: cpg-mssr: automate 'soc' node release in cpg_mssr_reserved

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID:
 <TYCPR01MB11332F2156EF1E5C2E04DD9C586552@TYCPR01MB11332.jpnprd01.prod.outlook.com>
Date: Thu, 31 Oct 2024 07:03:45 +0000
From: Biju Das <biju.das.jz@...renesas.com>
To: Biju Das <biju.das.jz@...renesas.com>, Javier Carrasco
	<javier.carrasco.cruz@...il.com>, Geert Uytterhoeven
	<geert+renesas@...der.be>, Michael Turquette <mturquette@...libre.com>,
	Stephen Boyd <sboyd@...nel.org>, Kuninori Morimoto
	<kuninori.morimoto.gx@...esas.com>
CC: "linux-renesas-soc@...r.kernel.org" <linux-renesas-soc@...r.kernel.org>,
	"linux-clk@...r.kernel.org" <linux-clk@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 2/2] clk: renesas: cpg-mssr: automate 'soc' node release
 in cpg_mssr_reserved_init()

Hi,

> -----Original Message-----
> From: Biju Das <biju.das.jz@...renesas.com>
> Sent: 31 October 2024 06:59
> Subject: RE: [PATCH 2/2] clk: renesas: cpg-mssr: automate 'soc' node release in
> cpg_mssr_reserved_init()
> 
> Hi Javier Carrasco,
> 
> Thanks for the patch
> 
> > -----Original Message-----
> > From: Javier Carrasco <javier.carrasco.cruz@...il.com>
> > Sent: 30 October 2024 23:26
> > Subject: [PATCH 2/2] clk: renesas: cpg-mssr: automate 'soc' node
> > release in cpg_mssr_reserved_init()
> >
> > Switch to a more robust approach by means of the cleanup attribute,
> > which automates the calls to
> > of_node_put() when 'soc' goes out of scope.
> >
> > Signed-off-by: Javier Carrasco <javier.carrasco.cruz@...il.com>
> > ---
> >  drivers/clk/renesas/renesas-cpg-mssr.c | 4 +---
> >  1 file changed, 1 insertion(+), 3 deletions(-)
> >
> > diff --git a/drivers/clk/renesas/renesas-cpg-mssr.c
> > b/drivers/clk/renesas/renesas-cpg-mssr.c
> > index 5dc89b1009fe..bf85501709f0 100644
> > --- a/drivers/clk/renesas/renesas-cpg-mssr.c
> > +++ b/drivers/clk/renesas/renesas-cpg-mssr.c
> > @@ -979,7 +979,7 @@ static void __init cpg_mssr_reserved_exit(struct
> > cpg_mssr_priv *priv)  static int __init cpg_mssr_reserved_init(struct cpg_mssr_priv *priv,
> >  					 const struct cpg_mssr_info *info)  {
> > -	struct device_node *soc = of_find_node_by_path("/soc");
> > +	struct device_node *soc __free(device_node) =
> > +of_find_node_by_path("/soc");
> 
> I guess. by looking at [1] and [2], the cleanup function should be of_node_put(), which translates to
> __free_of_node_put(), that extracts of_node_put() and execute it for cleanup??
> 
> [1] https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/tree/drivers/irqchip/irq-
> renesas-rzg2l.c?h=next-20241030#n535
> 
> [2] https://elixir.bootlin.com/linux/v6.12-rc5/source/include/linux/cleanup.h#L198

Please ignore me. I am wrong.

https://elixir.bootlin.com/linux/v6.12-rc5/source/include/linux/of.h#L138

Cheers,
Biju

> 
> Cheers,
> Biju
> 
> >  	struct device_node *node;
> >  	uint32_t args[MAX_PHANDLE_ARGS];
> >  	unsigned int *ids = NULL;
> > @@ -1022,7 +1022,6 @@ static int __init cpg_mssr_reserved_init(struct
> > cpg_mssr_priv *priv,
> >
> >  			ids = krealloc_array(ids, (num + 1), sizeof(*ids), GFP_KERNEL);
> >  			if (!ids) {
> > -				of_node_put(soc);
> >  				of_node_put(it.node);
> >  				return -ENOMEM;
> >  			}
> > @@ -1037,7 +1036,6 @@ static int __init cpg_mssr_reserved_init(struct cpg_mssr_priv *priv,
> >  			num++;
> >  		}
> >  	}
> > -	of_node_put(soc);
> >
> >  	priv->num_reserved_ids	= num;
> >  	priv->reserved_ids	= ids;
> >
> > --
> > 2.43.0
> >