linux-kernel - Re: [PATCH v3] nvmem: fix nvmem_cell_get_from

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Date:   Wed, 3 Oct 2018 09:28:09 +0100
From:   Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
To:     Bartosz Golaszewski <brgl@...ev.pl>, Arnd Bergmann <arnd@...db.de>,
        Greg KH <greg@...ah.com>,
        Stephen Rothwell <sfr@...b.auug.org.au>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Bartosz Golaszewski <bgolaszewski@...libre.com>
Subject: Re: [PATCH v3] nvmem: fix nvmem_cell_get_from_lookup()



On 03/10/18 08:31, Bartosz Golaszewski wrote:
> From: Bartosz Golaszewski <bgolaszewski@...libre.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@...libre.com>
> Reported-by: Stephen Rothwell <sfr@...b.auug.org.au>

Acked-by: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>

> ---
> v1 -> v2:
> - use ERR_CAST() instead of a direct pointer cast
> 
> v2 -> v3:
> - added the Reported-by tag
> 
>   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..f49474e1ad49 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 = ERR_CAST(nvmem);
>   				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;
>   			}
>   		}
>