linux-kernel - Re: [PATCH 1/3] input: misc: bma150: Use managed resources helpers

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Message-ID: <BYAPR02MB549573B44BDD22147A8375F9A3940@BYAPR02MB5495.namprd02.prod.outlook.com>
Date:   Sat, 26 Jan 2019 03:40:38 +0000
From:   Jonathan Bakker <xc-racer2@...e.ca>
To:     Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Paweł Chmiel <pawel.mikolaj.chmiel@...il.com>
CC:     "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-input@...r.kernel.org" <linux-input@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/3] input: misc: bma150: Use managed resources helpers



On 2019-01-25 5:29 p.m., Dmitry Torokhov wrote:
> On Fri, Jan 25, 2019 at 07:43:58PM +0100, Paweł Chmiel wrote:
>> From: Jonathan Bakker <xc-racer2@...e.ca>
>>
>> The driver can be cleaned up by using managed resource helpers
>>
>> Signed-off-by: Jonathan Bakker <xc-racer2@...e.ca>
>> Signed-off-by: Paweł Chmiel <pawel.mikolaj.chmiel@...il.com>
>> ---
>>  drivers/input/misc/bma150.c | 40 +++++++++++++------------------------
>>  1 file changed, 14 insertions(+), 26 deletions(-)
>>
>> diff --git a/drivers/input/misc/bma150.c b/drivers/input/misc/bma150.c
>> index 1efcfdf9f8a8..d101bb0a33d6 100644
>> --- a/drivers/input/misc/bma150.c
>> +++ b/drivers/input/misc/bma150.c
>> @@ -471,7 +471,7 @@ static int bma150_register_input_device(struct bma150_data *bma150)
>>  	struct input_dev *idev;
>>  	int error;
>>  
>> -	idev = input_allocate_device();
>> +	idev = devm_input_allocate_device(&bma150->client->dev);
>>  	if (!idev)
>>  		return -ENOMEM;
>>  
>> @@ -482,10 +482,8 @@ static int bma150_register_input_device(struct bma150_data *bma150)
>>  	input_set_drvdata(idev, bma150);
>>  
>>  	error = input_register_device(idev);
>> -	if (error) {
>> -		input_free_device(idev);
>> +	if (error)
>>  		return error;
>> -	}
>>  
>>  	bma150->input = idev;
>>  	return 0;
>> @@ -496,7 +494,7 @@ static int bma150_register_polled_device(struct bma150_data *bma150)
>>  	struct input_polled_dev *ipoll_dev;
>>  	int error;
>>  
>> -	ipoll_dev = input_allocate_polled_device();
>> +	ipoll_dev = devm_input_allocate_polled_device(&bma150->client->dev);
>>  	if (!ipoll_dev)
>>  		return -ENOMEM;
>>  
>> @@ -511,10 +509,8 @@ static int bma150_register_polled_device(struct bma150_data *bma150)
>>  	bma150_init_input_device(bma150, ipoll_dev->input);
>>  
>>  	error = input_register_polled_device(ipoll_dev);
>> -	if (error) {
>> -		input_free_polled_device(ipoll_dev);
>> +	if (error)
>>  		return error;
>> -	}
>>  
>>  	bma150->input_polled = ipoll_dev;
>>  	bma150->input = ipoll_dev->input;
>> @@ -543,7 +539,8 @@ static int bma150_probe(struct i2c_client *client,
>>  		return -EINVAL;
>>  	}
>>  
>> -	bma150 = kzalloc(sizeof(struct bma150_data), GFP_KERNEL);
>> +	bma150 = devm_kzalloc(&client->dev, sizeof(struct bma150_data),
>> +			      GFP_KERNEL);
>>  	if (!bma150)
>>  		return -ENOMEM;
>>  
>> @@ -556,7 +553,7 @@ static int bma150_probe(struct i2c_client *client,
>>  				dev_err(&client->dev,
>>  					"IRQ GPIO conf. error %d, error %d\n",
>>  					client->irq, error);
>> -				goto err_free_mem;
>> +				return error;
>>  			}
>>  		}
>>  		cfg = &pdata->cfg;
>> @@ -566,14 +563,14 @@ static int bma150_probe(struct i2c_client *client,
>>  
>>  	error = bma150_initialize(bma150, cfg);
>>  	if (error)
>> -		goto err_free_mem;
>> +		return error;
>>  
>>  	if (client->irq > 0) {
>>  		error = bma150_register_input_device(bma150);
>>  		if (error)
>> -			goto err_free_mem;
>> +			return error;
>>  
>> -		error = request_threaded_irq(client->irq,
>> +		error = devm_request_threaded_irq(&client->dev, client->irq,
>>  					NULL, bma150_irq_thread,
>>  					IRQF_TRIGGER_RISING | IRQF_ONESHOT,
>>  					BMA150_DRIVER, bma150);
>> @@ -582,12 +579,12 @@ static int bma150_probe(struct i2c_client *client,
>>  				"irq request failed %d, error %d\n",
>>  				client->irq, error);
>>  			input_unregister_device(bma150->input);
> 
> No need to unregister manually if you are using devm.
Ok, got it, will fix.  I seemed to do this a lot :)
> 
>> -			goto err_free_mem;
>> +			return error;
>>  		}
>>  	} else {
>>  		error = bma150_register_polled_device(bma150);
>>  		if (error)
>> -			goto err_free_mem;
>> +			return error;
>>  	}
>>  
>>  	i2c_set_clientdata(client, bma150);
>> @@ -595,10 +592,6 @@ static int bma150_probe(struct i2c_client *client,
>>  	pm_runtime_enable(&client->dev);
>>  
>>  	return 0;
>> -
>> -err_free_mem:
>> -	kfree(bma150);
>> -	return error;
>>  }
>>  
>>  static int bma150_remove(struct i2c_client *client)
>> @@ -607,15 +600,10 @@ static int bma150_remove(struct i2c_client *client)
>>  
>>  	pm_runtime_disable(&client->dev);
>>  
>> -	if (client->irq > 0) {
>> -		free_irq(client->irq, bma150);
>> +	if (client->irq > 0)
>>  		input_unregister_device(bma150->input);
> 
> Here as well.
> 
>> -	} else {
>> +	else
>>  		input_unregister_polled_device(bma150->input_polled);
> 
> And here.
> 
>> -		input_free_polled_device(bma150->input_polled);
>> -	}
>> -
>> -	kfree(bma150);
>>  
>>  	return 0;
>>  }
>> -- 
>> 2.17.1
>>
> 
> Thanks.
> 
Thanks,
Jonathan