From: Alban Bedel Date: Mon, 28 Jan 2019 15:55:03 +0000 (+0000) Subject: nvmem: core: Properly handle connection ID in of_nvmem_device_get() X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=d4e7fef1a9a5d2bf3f859ba9f50f4d5409a09ab0;p=openwrt%2Fstaging%2Fblogic.git 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 Signed-off-by: Srinivas Kandagatla Signed-off-by: Greg Kroah-Hartman --- 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); }