[PATCH -next 2/2] nvmem: core: add error handling for dev_set_name

From: Gaosheng Cui
Date: Tue Aug 16 2022 - 09:50:06 EST


The type of return value of dev_set_name is int, which may return
wrong result, so we add error handling for it to reclaim memory
of nvmem resource, and return early when an error occurs.

Signed-off-by: Gaosheng Cui <cuigaosheng1@xxxxxxxxxx>
---
drivers/nvmem/core.c | 12 +++++++++---
1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/drivers/nvmem/core.c b/drivers/nvmem/core.c
index 2164efd12ba9..321d7d63e068 100644
--- a/drivers/nvmem/core.c
+++ b/drivers/nvmem/core.c
@@ -810,18 +810,24 @@ struct nvmem_device *nvmem_register(const struct nvmem_config *config)

switch (config->id) {
case NVMEM_DEVID_NONE:
- dev_set_name(&nvmem->dev, "%s", config->name);
+ rval = dev_set_name(&nvmem->dev, "%s", config->name);
break;
case NVMEM_DEVID_AUTO:
- dev_set_name(&nvmem->dev, "%s%d", config->name, nvmem->id);
+ rval = dev_set_name(&nvmem->dev, "%s%d", config->name, nvmem->id);
break;
default:
- dev_set_name(&nvmem->dev, "%s%d",
+ rval = dev_set_name(&nvmem->dev, "%s%d",
config->name ? : "nvmem",
config->name ? config->id : nvmem->id);
break;
}

+ if (rval) {
+ ida_free(&nvmem_ida, nvmem->id);
+ kfree(nvmem);
+ return ERR_PTR(rval);
+ }
+
nvmem->read_only = device_property_present(config->dev, "read-only") ||
config->read_only || !nvmem->reg_write;

--
2.25.1