linux-kernel - Re: [PATCH 1/2] pinctrl: th1520: Convert to thp->mutex to guarded mutex

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Message-ID: <a42a738a-b52d-4ff9-ac21-cffd808bc055@wanadoo.fr>
Date: Sat, 5 Oct 2024 21:43:06 +0200
From: Christophe JAILLET <christophe.jaillet@...adoo.fr>
To: Drew Fustini <dfustini@...storrent.com>, Drew Fustini <drew@...7.com>,
 Guo Ren <guoren@...nel.org>, Fu Wei <wefu@...hat.com>,
 Linus Walleij <linus.walleij@...aro.org>
Cc: linux-riscv@...ts.infradead.org, linux-gpio@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] pinctrl: th1520: Convert to thp->mutex to guarded
 mutex

Le 05/10/2024 à 21:35, Drew Fustini a écrit :
> Convert th1520_pinctrl_dt_node_to_map() to use guarded mutex for
> thp->mutex.
> 
> Suggested-by: Linus Walleij <linus.walleij@...aro.org>
> Signed-off-by: Drew Fustini <dfustini@...storrent.com>
> ---
>   drivers/pinctrl/pinctrl-th1520.c | 8 +++-----
>   1 file changed, 3 insertions(+), 5 deletions(-)
> 

Hi,

> diff --git a/drivers/pinctrl/pinctrl-th1520.c b/drivers/pinctrl/pinctrl-th1520.c
> index 9331f4462480..d03a0a34220a 100644
> --- a/drivers/pinctrl/pinctrl-th1520.c
> +++ b/drivers/pinctrl/pinctrl-th1520.c
> @@ -425,7 +425,7 @@ static int th1520_pinctrl_dt_node_to_map(struct pinctrl_dev *pctldev,
>   	int ret;
>   
>   	nmaps = 0;
> -	for_each_available_child_of_node(np, child) {
> +	for_each_available_child_of_node_scoped(np, child) {

Using _scoped iterator is not described in the commit message.
Is it expected to be part of this patch?

If yes, the "of_node_put(child);" just a few lines below should be removed.

>   		int npins = of_property_count_strings(child, "pins");
>   
>   		if (npins <= 0) {
> @@ -444,8 +444,8 @@ static int th1520_pinctrl_dt_node_to_map(struct pinctrl_dev *pctldev,
>   		return -ENOMEM;
>   
>   	nmaps = 0;
> -	mutex_lock(&thp->mutex);
> -	for_each_available_child_of_node(np, child) {
> +	guard(mutex)(&thp->mutex);
> +	for_each_available_child_of_node_scoped(np, child) {

Same here...

>   		unsigned int rollback = nmaps;
>   		enum th1520_muxtype muxtype;
>   		struct property *prop;
> @@ -530,7 +530,6 @@ static int th1520_pinctrl_dt_node_to_map(struct pinctrl_dev *pctldev,
>   
>   	*maps = map;
>   	*num_maps = nmaps;
> -	mutex_unlock(&thp->mutex);
>   	return 0;
>   
>   free_configs:
> @@ -538,7 +537,6 @@ static int th1520_pinctrl_dt_node_to_map(struct pinctrl_dev *pctldev,
>   put_child:
>   	of_node_put(child);

... this should be removed, and maybe the label renamed.

CJ

>   	th1520_pinctrl_dt_free_map(pctldev, map, nmaps);
> -	mutex_unlock(&thp->mutex);
>   	return ret;
>   }
>   
>