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From:   Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
To:     gregkh@linuxfoundation.org
Cc:     linux-kernel@vger.kernel.org,
        Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
        Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Subject: [PATCH 03/13] nvmem: core: Check input parameter for NULL in nvmem_unregister()
Date:   Sun, 20 Feb 2022 15:15:17 +0000
Message-Id: <20220220151527.17216-4-srinivas.kandagatla@linaro.org>
In-Reply-To: <20220220151527.17216-1-srinivas.kandagatla@linaro.org>
References: <20220220151527.17216-1-srinivas.kandagatla@linaro.org>
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From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

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>
---
 drivers/nvmem/core.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/nvmem/core.c b/drivers/nvmem/core.c
index 327c88c432f0..f58d9bc7aa08 100644
--- a/drivers/nvmem/core.c
+++ b/drivers/nvmem/core.c
@@ -903,7 +903,8 @@ static void nvmem_device_release(struct kref *kref)
  */
 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);
 
-- 
2.21.0