linux-kernel - Re: [PATCH RFC v3 1/3] i2c: i2c-bfin-twi: convert to devm

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Message-ID: <51A451CE.8070801@huawei.com>
Date:	Tue, 28 May 2013 14:42:22 +0800
From:	Libo Chen <clbchenlibo.chen@...wei.com>
To:	Sachin Kamat <sachin.kamat@...aro.org>
CC:	Libo Chen <libo.chen@...wei.com>, <wsa@...-dreams.de>,
	<guz.fnst@...fujitsu.com>, <sonic.zhang@...log.com>,
	<uclinux-dist-devel@...ckfin.uclinux.org>,
	<linux-i2c@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<lizefan@...wei.com>
Subject: Re: [PATCH RFC v3 1/3] i2c: i2c-bfin-twi: convert to devm_* API

thanks for your review. I will update later.

Libo

On 2013/5/24 11:19, Sachin Kamat wrote:
> On 23 May 2013 17:30, Libo Chen <libo.chen@...wei.com> wrote:
>> peripheral_request_list has got free if any one faild, so no need to free again in err case.
>> aovid this, convert them to devm_* API
>>
>> Signed-off-by: Libo Chen <libo.chen@...wei.com>
> 
> It is a good practice to include changelog while submitting revised
> versions of the patch.
> 
>> ---
>>  drivers/i2c/busses/i2c-bfin-twi.c |   38 +++++++++---------------------------
>>  1 files changed, 10 insertions(+), 28 deletions(-)
>>
>> diff --git a/drivers/i2c/busses/i2c-bfin-twi.c b/drivers/i2c/busses/i2c-bfin-twi.c
>> index 05080c4..2b99c48 100644
>> --- a/drivers/i2c/busses/i2c-bfin-twi.c
>> +++ b/drivers/i2c/busses/i2c-bfin-twi.c
>> @@ -621,35 +621,27 @@ static int i2c_bfin_twi_probe(struct platform_device *pdev)
>>         int rc;
>>         unsigned int clkhilow;
>>
>> -       iface = kzalloc(sizeof(struct bfin_twi_iface), GFP_KERNEL);
>> +       iface = devm_kzalloc(&pdev->dev, sizeof(struct bfin_twi_iface),
>> +                       GFP_KERNEL);
>>         if (!iface) {
>>                 dev_err(&pdev->dev, "Cannot allocate memory\n");
> 
> This error message is not really required.
> 
>> -               rc = -ENOMEM;
>> -               goto out_error_nomem;
>> +               return -ENOMEM;
>>         }
>>
>>         spin_lock_init(&(iface->lock));
>>
>>         /* Find and map our resources */
>>         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>> -       if (res == NULL) {
>> -               dev_err(&pdev->dev, "Cannot get IORESOURCE_MEM\n");
>> -               rc = -ENOENT;
>> -               goto out_error_get_res;
>> -       }
>> -
>> -       iface->regs_base = ioremap(res->start, resource_size(res));
>> -       if (iface->regs_base == NULL) {
>> +       iface->regs_base = devm_ioremap_resource(&pdev->dev, res);
>> +       if (IS_ERR(iface->regs_base)) {
>>                 dev_err(&pdev->dev, "Cannot map IO\n");
> 
> devm_ioremap_resource prints out the error messages. So the above line
> is redundant.
> 
>> -               rc = -ENXIO;
>> -               goto out_error_ioremap;
>> +               return -ENXIO;
> 
> Why not return PTR_ERR(iface->regs_base)?
> 
>>         }
>>
>>         iface->irq = platform_get_irq(pdev, 0);
>>         if (iface->irq < 0) {
>>                 dev_err(&pdev->dev, "No IRQ specified\n");
>> -               rc = -ENOENT;
>> -               goto out_error_no_irq;
>> +               return -ENOENT;
>>         }
>>
>>         p_adap = &iface->adap;
>> @@ -666,10 +658,10 @@ static int i2c_bfin_twi_probe(struct platform_device *pdev)
>>                                         "i2c-bfin-twi");
>>         if (rc) {
>>                 dev_err(&pdev->dev, "Can't setup pin mux!\n");
>> -               goto out_error_pin_mux;
>> +               return rc;
>>         }
>>
>> -       rc = request_irq(iface->irq, bfin_twi_interrupt_entry,
>> +       rc = devm_request_irq(&pdev->dev, iface->irq, bfin_twi_interrupt_entry,
>>                 0, pdev->name, iface);
>>         if (rc) {
>>                 dev_err(&pdev->dev, "Can't get IRQ %d !\n", iface->irq);
>> @@ -707,16 +699,9 @@ static int i2c_bfin_twi_probe(struct platform_device *pdev)
>>         return 0;
>>
>>  out_error_add_adapter:
>> -       free_irq(iface->irq, iface);
>>  out_error_req_irq:
>> -out_error_no_irq:
>>         peripheral_free_list((unsigned short *)pdev->dev.platform_data);
>> -out_error_pin_mux:
>> -       iounmap(iface->regs_base);
>> -out_error_ioremap:
>> -out_error_get_res:
>> -       kfree(iface);
>> -out_error_nomem:
>> +
> 
> Empty line not required.
> 
> You could probably combine all the empty labels into one meaningful label above.
> 
>>         return rc;
> 
> 


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