linux-kernel - Re: [PATCH] gpio: sim: lock hog configfs items if present

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Message-ID: <ve5d4rxl7z3fcn7iowf4u6oeq6656ivdjxknrnnx7fshj44574@f23vcqbu6vhc>
Date: Mon, 3 Feb 2025 21:52:46 +0900
From: Koichiro Den <koichiro.den@...onical.com>
To: Bartosz Golaszewski <brgl@...ev.pl>
Cc: Linus Walleij <linus.walleij@...aro.org>, linux-gpio@...r.kernel.org, 
	linux-kernel@...r.kernel.org, Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: Re: [PATCH] gpio: sim: lock hog configfs items if present

On Mon, Feb 03, 2025 at 12:01:23PM GMT, Bartosz Golaszewski wrote:
> From: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
> 
> Depending on the user config, the leaf entry may be the hog directory,
> not line. Check it and lock the correct item.
> 
> Fixes: 8bd76b3d3f3a ("gpio: sim: lock up configfs that an instantiated device depends on")
> Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
> ---
>  drivers/gpio/gpio-sim.c | 11 +++++++----
>  1 file changed, 7 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/gpio/gpio-sim.c b/drivers/gpio/gpio-sim.c
> index a086087ada17..b843682b47e9 100644
> --- a/drivers/gpio/gpio-sim.c
> +++ b/drivers/gpio/gpio-sim.c
> @@ -1028,6 +1028,7 @@ gpio_sim_device_lockup_configfs(struct gpio_sim_device *dev, bool lock)
>  	struct configfs_subsystem *subsys = dev->group.cg_subsys;
>  	struct gpio_sim_bank *bank;
>  	struct gpio_sim_line *line;
> +	struct config_item *item;
>  
>  	/*
>  	 * The device only needs to depend on leaf line entries. This is
> @@ -1036,12 +1037,14 @@ gpio_sim_device_lockup_configfs(struct gpio_sim_device *dev, bool lock)
>  	 */
>  	list_for_each_entry(bank, &dev->bank_list, siblings) {
>  		list_for_each_entry(line, &bank->line_list, siblings) {
> +			item = line->hog ? &line->hog->item
> +					 : &line->group.cg_item;
> +
>  			if (lock)
> -				WARN_ON(configfs_depend_item_unlocked(
> -						subsys, &line->group.cg_item));
> +				WARN_ON(configfs_depend_item_unlocked(subsys,
> +								      item));
>  			else
> -				configfs_undepend_item_unlocked(
> -						&line->group.cg_item);
> +				configfs_undepend_item_unlocked(item);
>  		}
>  	}
>  }
> -- 
> 2.45.2
> 

Thanks for spotting this and the fix.

Tested-by: Koichiro Den <koichiro.den@...onical.com>