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

From: Srinivas Kandagatla
Date: Wed Oct 03 2018 - 04:28:14 EST




On 03/10/18 08:31, Bartosz Golaszewski wrote:
From: Bartosz Golaszewski <bgolaszewski@xxxxxxxxxxxx>

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@xxxxxxxxxxxx>
Reported-by: Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx>

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

---
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;
}
}