Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
Subject: Re: [PATCH] nvmem: fix nvmem_cell_get_from_lookup()
To:     Bartosz Golaszewski <brgl@bgdev.pl>,
        Srinivas Kandagatla <srinivas.kandagatla@linaro.org>,
        "David S . Miller" <davem@davemloft.net>,
        Mauro Carvalho Chehab <mchehab+samsung@kernel.org>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        Arnd Bergmann <arnd@arndb.de>,
        Jonathan Corbet <corbet@lwn.net>, Sekhar Nori <nsekhar@ti.com>,
        Kevin Hilman <khilman@kernel.org>,
        Boris Brezillon <boris.brezillon@bootlin.com>,
        Andrew Lunn <andrew@lunn.ch>, Alban Bedel <albeu@free.fr>,
        Maxime Ripard <maxime.ripard@bootlin.com>,
        Chen-Yu Tsai <wens@csie.org>,
        Dan Carpenter <dan.carpenter@oracle.com>
Cc:     linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org,
        Bartosz Golaszewski <bgolaszewski@baylibre.com>
References: <20181001100052.3580-1-brgl@bgdev.pl>
From:   David Lechner <david@lechnology.com>
Message-ID: <44adbace-6849-e37f-70f0-d11661e6bdc9@lechnology.com>
Date:   Mon, 1 Oct 2018 11:03:47 -0500
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101
 Thunderbird/52.9.1
MIME-Version: 1.0
In-Reply-To: <20181001100052.3580-1-brgl@bgdev.pl>
Content-Type: text/plain; charset=utf-8; format=flowed
Content-Language: en-US
Content-Transfer-Encoding: 7bit
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

On 10/01/2018 05:00 AM, Bartosz Golaszewski wrote:
> From: Bartosz Golaszewski <bgolaszewski@baylibre.com>
> 
> We check if the pointer returned by __nvmem_device_get() is not NULL
> while we should actually check if it is not IS_ERR(nvmem). Fix it.
> 
> While we're at it: fix the next error path where we should assign an
> error value to cell before returning.
> 
> Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
> ---
>   drivers/nvmem/core.c | 5 +++--
>   1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/nvmem/core.c b/drivers/nvmem/core.c
> index ad1227df1984..8249621d11a6 100644
> --- a/drivers/nvmem/core.c
> +++ b/drivers/nvmem/core.c
> @@ -952,9 +952,9 @@ nvmem_cell_get_from_lookup(struct device *dev, const char *con_id)
>   		    (strcmp(lookup->con_id, con_id) == 0)) {
>   			/* This is the right entry. */
>   			nvmem = __nvmem_device_get(NULL, lookup->nvmem_name);
> -			if (!nvmem) {
> +			if (IS_ERR(nvmem)) {
>   				/* Provider may not be registered yet. */
> -				cell = ERR_PTR(-EPROBE_DEFER);
> +				cell = (struct nvmem_cell *)nvmem;

perhaps ERR_CAST() would better indicate the intent here?

>   				goto out;
>   			}
>   
> @@ -962,6 +962,7 @@ nvmem_cell_get_from_lookup(struct device *dev, const char *con_id)
>   						       lookup->cell_name);
>   			if (!cell) {
>   				__nvmem_device_put(nvmem);
> +				cell = ERR_PTR(-ENOENT);
>   				goto out;
>   			}
>   		}
>