linux-kernel - [PATCH v2 4/7] nvmem: increase the reference count of a gpio passed over config

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Message-Id: <20200218094234.23896-5-brgl@bgdev.pl>
Date:   Tue, 18 Feb 2020 10:42:31 +0100
From:   Bartosz Golaszewski <brgl@...ev.pl>
To:     Linus Walleij <linus.walleij@...aro.org>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Khouloud Touil <ktouil@...libre.com>,
        Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
        Bartosz Golaszewski <bgolaszewski@...libre.com>
Subject: [PATCH v2 4/7] nvmem: increase the reference count of a gpio passed over config

From: Bartosz Golaszewski <bgolaszewski@...libre.com>

We can obtain the write-protect GPIO in nvmem_register() by requesting
it ourselves or by storing the gpio_desc passed in nvmem_config. In the
latter case we need to increase the reference count so that it gets
freed correctly.

Signed-off-by: Bartosz Golaszewski <bgolaszewski@...libre.com>
---
 drivers/nvmem/core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/nvmem/core.c b/drivers/nvmem/core.c
index c9b3f4047154..c4a6c044b020 100644
--- a/drivers/nvmem/core.c
+++ b/drivers/nvmem/core.c
@@ -346,7 +346,7 @@ struct nvmem_device *nvmem_register(const struct nvmem_config *config)
 	if (rval < 0)
 		goto err_free_nvmem;
 	if (config->wp_gpio)
-		nvmem->wp_gpio = config->wp_gpio;
+		nvmem->wp_gpio = gpiod_ref(config->wp_gpio);
 	else
 		nvmem->wp_gpio = gpiod_get_optional(config->dev, "wp",
 						    GPIOD_OUT_HIGH);
-- 
2.25.0