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From 8c751e0d9a5264376935a84429a2d468c8877d99 Mon Sep 17 00:00:00 2001
From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Date: Sun, 20 Feb 2022 15:15:17 +0000
Subject: [PATCH] nvmem: core: Check input parameter for NULL in
nvmem_unregister()
nvmem_unregister() frees resources and standard pattern is to allow
caller to not care if it's NULL or not. This will reduce burden on
the callers to perform this check.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20220220151527.17216-4-srinivas.kandagatla@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/nvmem/core.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/drivers/nvmem/core.c
+++ b/drivers/nvmem/core.c
@@ -904,7 +904,8 @@ static void nvmem_device_release(struct
*/
void nvmem_unregister(struct nvmem_device *nvmem)
{
- kref_put(&nvmem->refcnt, nvmem_device_release);
+ if (nvmem)
+ kref_put(&nvmem->refcnt, nvmem_device_release);
}
EXPORT_SYMBOL_GPL(nvmem_unregister);
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