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Tue, 11 Jan 2022 17:32:58 +0000 Date: Tue, 11 Jan 2022 20:32:43 +0300 From: Dan Carpenter To: William Breathitt Gray Cc: Uwe =?iso-8859-1?q?Kleine-K=F6nig?= , Jonathan Cameron , Greg Kroah-Hartman , linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org, kernel-janitors@vger.kernel.org Subject: [PATCH v2] counter: fix an IS_ERR() vs NULL bug Message-ID: <20220111173243.GA2192@kili> Content-Disposition: inline User-Agent: Mutt/1.10.1 (2018-07-13) X-ClientProxiedBy: ZR0P278CA0157.CHEP278.PROD.OUTLOOK.COM (2603:10a6:910:41::22) To MWHPR1001MB2365.namprd10.prod.outlook.com (2603:10b6:301:2d::28) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: bf96b445-9af7-4b11-7eb6-08d9d52868f6 X-MS-TrafficTypeDiagnostic: CO1PR10MB4641:EE_ X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:2201; X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:MWHPR1001MB2365.namprd10.prod.outlook.com;PTR:;CAT:NONE;SFS:(7916004)(366004)(8676002)(26005)(8936002)(38100700002)(38350700002)(6666004)(6506007)(186003)(83380400001)(44832011)(33656002)(66946007)(33716001)(6512007)(9686003)(5660300002)(6916009)(316002)(66556008)(66476007)(2906002)(54906003)(6486002)(508600001)(52116002)(4326008)(86362001)(1076003);DIR:OUT;SFP:1101; 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I think NULL is the better thing to return for allocation functions so update counter_alloc() and devm_counter_alloc() to return NULL instead of error pointers. Fixes: c18e2760308e ("counter: Provide alternative counter registration functions") Signed-off-by: Dan Carpenter Acked-by: Uwe Kleine-König Acked-by: William Breathitt Gray --- v2: make additional style changes drivers/counter/counter-core.c | 15 ++++++--------- 1 file changed, 6 insertions(+), 9 deletions(-) diff --git a/drivers/counter/counter-core.c b/drivers/counter/counter-core.c index 7e0957eea094..869894b74741 100644 --- a/drivers/counter/counter-core.c +++ b/drivers/counter/counter-core.c @@ -90,10 +90,8 @@ struct counter_device *counter_alloc(size_t sizeof_priv) int err; ch = kzalloc(sizeof(*ch) + sizeof_priv, GFP_KERNEL); - if (!ch) { - err = -ENOMEM; - goto err_alloc_ch; - } + if (!ch) + return NULL; counter = &ch->counter; dev = &counter->dev; @@ -123,9 +121,8 @@ struct counter_device *counter_alloc(size_t sizeof_priv) err_ida_alloc: kfree(ch); -err_alloc_ch: - return ERR_PTR(err); + return NULL; } EXPORT_SYMBOL_GPL(counter_alloc); @@ -208,12 +205,12 @@ struct counter_device *devm_counter_alloc(struct device *dev, size_t sizeof_priv int err; counter = counter_alloc(sizeof_priv); - if (IS_ERR(counter)) - return counter; + if (!counter) + return NULL; err = devm_add_action_or_reset(dev, devm_counter_put, counter); if (err < 0) - return ERR_PTR(err); + return NULL; return counter; }