linux-kernel - [PATCH 4/4] i2c-dev: Adjust checks for null pointers in three functions

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Message-ID: <7ba4f7a9-9af4-4a83-776c-930fb33f9e9e@users.sourceforge.net>
Date:   Fri, 23 Sep 2016 21:47:31 +0200
From:   SF Markus Elfring <elfring@...rs.sourceforge.net>
To:     linux-i2c@...r.kernel.org, Wolfram Sang <wsa@...-dreams.de>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        kernel-janitors@...r.kernel.org,
        Julia Lawall <julia.lawall@...6.fr>
Subject: [PATCH 4/4] i2c-dev: Adjust checks for null pointers in three
 functions

From: Markus Elfring <elfring@...rs.sourceforge.net>
Date: Fri, 23 Sep 2016 21:30:20 +0200
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

The script "checkpatch.pl" can point information out like the following.

Comparison to NULL could be written !…

Thus fix the affected source code places.

Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>
---
 drivers/i2c/i2c-dev.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/i2c/i2c-dev.c b/drivers/i2c/i2c-dev.c
index 7d3e3ca..8f7eddd 100644
--- a/drivers/i2c/i2c-dev.c
+++ b/drivers/i2c/i2c-dev.c
@@ -147,7 +147,7 @@ static ssize_t i2cdev_read(struct file *file, char __user *buf, size_t count,
 		count = 8192;
 
 	tmp = kmalloc(count, GFP_KERNEL);
-	if (tmp == NULL)
+	if (!tmp)
 		return -ENOMEM;
 
 	pr_debug("i2c-dev: i2c-%d reading %zu bytes.\n",
@@ -263,7 +263,7 @@ static noinline int i2cdev_ioctl_rdwr(struct i2c_client *client,
 	data_ptrs = kmalloc_array(rdwr_arg.nmsgs,
 				  sizeof(*data_ptrs),
 				  GFP_KERNEL);
-	if (data_ptrs == NULL) {
+	if (!data_ptrs) {
 		kfree(rdwr_pa);
 		return -ENOMEM;
 	}
@@ -374,7 +374,7 @@ static noinline int i2cdev_ioctl_smbus(struct i2c_client *client,
 				      client->flags, data_arg.read_write,
 				      data_arg.command, data_arg.size, NULL);
 
-	if (data_arg.data == NULL) {
+	if (!data_arg.data) {
 		dev_dbg(&client->adapter->dev,
 			"data is NULL pointer in ioctl I2C_SMBUS.\n");
 		return -EINVAL;
-- 
2.10.0