linux-kernel - [PATCH v1 3/5] nvmem: core: Check input parameter for NULL in nvmem

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Date:   Tue,  4 Jan 2022 15:38:41 +0200
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Miquel Raynal <miquel.raynal@...tlin.com>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-usb@...r.kernel.org
Cc:     Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        Andreas Noever <andreas.noever@...il.com>,
        Michael Jamet <michael.jamet@...el.com>,
        Yehezkel Bernat <YehezkelShB@...il.com>,
        Alexander Usyskin <alexander.usyskin@...el.com>
Subject: [PATCH v1 3/5] 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@...ux.intel.com>
---
 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 6946d14876dc..3ca6615d9430 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);
 
-- 
2.34.1