linux-kernel - Re: [PATCH 2/2] serial: amba-pl010: Use devres APIs

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Message-ID: <53ABE9F0.9090003@gmail.com>
Date:	Thu, 26 Jun 2014 15:07:52 +0530
From:	Tushar Behera <trblinux@...il.com>
To:	Daniel Thompson <daniel.thompson@...aro.org>,
	Tushar Behera <tushar.b@...sung.com>,
	linux-kernel@...r.kernel.org, linux-serial@...r.kernel.org,
	jslaby@...e.cz, gregkh@...uxfoundation.org, linux@....linux.org.uk
Subject: Re: [PATCH 2/2] serial: amba-pl010: Use devres APIs

On 06/23/2014 06:16 PM, Daniel Thompson wrote:
> On 23/06/14 06:59, Tushar Behera wrote:
>> Migrating to use devres managed APIs devm_kzalloc, devm_ioremap and
>> devm_clk_get.
>>
>> Signed-off-by: Tushar Behera <tushar.b@...sung.com>
>> ---
>>  drivers/tty/serial/amba-pl010.c |   46 ++++++++++++++-------------------------
>>  1 file changed, 16 insertions(+), 30 deletions(-)
>>
>> diff --git a/drivers/tty/serial/amba-pl010.c b/drivers/tty/serial/amba-pl010.c
>> index 971af1e..af8deba 100644
>> --- a/drivers/tty/serial/amba-pl010.c
>> +++ b/drivers/tty/serial/amba-pl010.c
>> @@ -46,6 +46,7 @@
>>  #include <linux/amba/serial.h>
>>  #include <linux/clk.h>
>>  #include <linux/slab.h>
>> +#include <linux/io.h>
>>  
>>  #include <asm/io.h>
> 
> Adding <linux/io.h> makes including <asm/io.h> redundant.
> 

Okay, I will remove the <asm/io.h> in next iteration.

> 
>> @@ -688,28 +689,22 @@ static int pl010_probe(struct amba_device *dev, const struct amba_id *id)
>>  		if (amba_ports[i] == NULL)
>>  			break;
>>  
>> -	if (i == ARRAY_SIZE(amba_ports)) {
>> -		ret = -EBUSY;
>> -		goto out;
>> -	}
>> +	if (i == ARRAY_SIZE(amba_ports))
>> +		return -EBUSY;
>>  
>> -	uap = kzalloc(sizeof(struct uart_amba_port), GFP_KERNEL);
>> -	if (!uap) {
>> -		ret = -ENOMEM;
>> -		goto out;
>> -	}
>> +	uap = devm_kzalloc(&dev->dev, sizeof(struct uart_amba_port),
>> +			   GFP_KERNEL);
>> +	if (!uap)
>> +		return -ENOMEM;
>>  
>> -	base = ioremap(dev->res.start, resource_size(&dev->res));
>> -	if (!base) {
>> -		ret = -ENOMEM;
>> -		goto free;
>> -	}
>> +	base = devm_ioremap(&dev->dev, dev->res.start,
>> +			    resource_size(&dev->res));
>> +	if (!base)
>> +		return -ENOMEM;
>>  
>> -	uap->clk = clk_get(&dev->dev, NULL);
>> -	if (IS_ERR(uap->clk)) {
>> -		ret = PTR_ERR(uap->clk);
>> -		goto unmap;
>> -	}
>> +	uap->clk = devm_clk_get(&dev->dev, NULL);
>> +	if (IS_ERR(uap->clk))
>> +		return PTR_ERR(uap->clk);
>>  
>>  	uap->port.dev = &dev->dev;
>>  	uap->port.mapbase = dev->res.start;
>> @@ -727,15 +722,9 @@ static int pl010_probe(struct amba_device *dev, const struct amba_id *id)
>>  
>>  	amba_set_drvdata(dev, uap);
>>  	ret = uart_add_one_port(&amba_reg, &uap->port);
>> -	if (ret) {
>> +	if (ret)
>>  		amba_ports[i] = NULL;
>> -		clk_put(uap->clk);
>> - unmap:
>> -		iounmap(base);
>> - free:
>> -		kfree(uap);
>> -	}
>> - out:
>> +
>>  	return ret;
>>  }
>>  
>> @@ -750,9 +739,6 @@ static int pl010_remove(struct amba_device *dev)
>>  		if (amba_ports[i] == uap)
>>  			amba_ports[i] = NULL;
>>  
>> -	iounmap(uap->port.membase);
>> -	clk_put(uap->clk);
>> -	kfree(uap);
>>  	return 0;
>>  }
> 
> Reviewed-by: Daniel Thompson <daniel.thompson@...aro.org>
> 

Thanks for reviewing.

-- 
Tushar Behera
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