[PATCH v3] nvmem: fix nvmem_cell_get_from_lookup()

[PATCH v3] nvmem: fix nvmem_cell_get_from_lookup()

[Bartosz Golaszewski]

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>
Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
---
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;
 			}
 		}
-- 
2.19.0

Re: [PATCH v3] nvmem: fix nvmem_cell_get_from_lookup()

[Srinivas Kandagatla]

On 03/10/18 08:31, 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>
> Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>

Acked-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.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;
>   			}
>   		}
>