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

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Date:   Wed,  3 Oct 2018 09:31:11 +0200
From:   Bartosz Golaszewski <brgl@...ev.pl>
To:     Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        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: [PATCH v3] nvmem: fix nvmem_cell_get_from_lookup()

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>
---
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