linux-kernel - Re: [PATCH v3 01/24] gpio: protect the list of GPIO devices with SRCU

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Message-ID: <20240210110043.853-1-hdanton@sina.com>
Date: Sat, 10 Feb 2024 19:00:41 +0800
From: Hillf Danton <hdanton@...a.com>
To: Bartosz Golaszewski <brgl@...ev.pl>
Cc: Linus Walleij <linus.walleij@...aro.org>,
	"Paul E . McKenney" <paulmck@...nel.org>,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	Wolfram Sang <wsa@...-dreams.de>,
	linux-gpio@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: Re: [PATCH v3 01/24] gpio: protect the list of GPIO devices with SRCU

On Thu,  8 Feb 2024 10:58:57 +0100 Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
> @@ -382,11 +389,13 @@ static int gpiodev_add_to_list_unlocked(struct gpio_device *gdev)
>  		/* add between prev and next */
>  		if (prev->base + prev->ngpio <= gdev->base
>  				&& gdev->base + gdev->ngpio <= next->base) {
> -			list_add(&gdev->list, &prev->list);
> +			list_add_rcu(&gdev->list, &prev->list);
>  			return 0;
>  		}
>  	}
>  
> +	synchronize_srcu(&gpio_devices_srcu);
> +
If not typo, could you shed light on why this sync is needed?

>  	return -EBUSY;
>  }