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authorAlban Bedel <albeu@free.fr>2019-01-28 16:55:03 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2019-01-31 16:24:14 +0100
commitd4e7fef1a9a5d2bf3f859ba9f50f4d5409a09ab0 (patch)
tree441f6de49efc28711535143afa244f62746645fc /drivers/nvmem
parentnvmem: core: Fix cell lookup when no cell is found (diff)
downloadlinux-d4e7fef1a9a5d2bf3f859ba9f50f4d5409a09ab0.tar.xz
linux-d4e7fef1a9a5d2bf3f859ba9f50f4d5409a09ab0.zip
nvmem: core: Properly handle connection ID in of_nvmem_device_get()
of_nvmem_device_get() would crash if NULL was passed as a connection ID. Rework this to use the usual sementic of assuming the first connection when no connection ID is given. Furthermore of_nvmem_device_get() would return -EINVAL when it failed to resolve the connection, making it impossible to properly implement an optional connection. Return -ENOENT instead to let the caller know that the connection doesn't exists. Signed-off-by: Alban Bedel <albeu@free.fr> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/nvmem')
-rw-r--r--drivers/nvmem/core.c7
1 files changed, 4 insertions, 3 deletions
diff --git a/drivers/nvmem/core.c b/drivers/nvmem/core.c
index a2ad44104aa2..a749a5cb0a4e 100644
--- a/drivers/nvmem/core.c
+++ b/drivers/nvmem/core.c
@@ -839,13 +839,14 @@ struct nvmem_device *of_nvmem_device_get(struct device_node *np, const char *id)
{
struct device_node *nvmem_np;
- int index;
+ int index = 0;
- index = of_property_match_string(np, "nvmem-names", id);
+ if (id)
+ index = of_property_match_string(np, "nvmem-names", id);
nvmem_np = of_parse_phandle(np, "nvmem", index);
if (!nvmem_np)
- return ERR_PTR(-EINVAL);
+ return ERR_PTR(-ENOENT);
return __nvmem_device_get(nvmem_np, NULL);
}