linux-kernel - Re: [PATCH 5/5] drivers/video/exynos/exynos_dp_core.c: use devm

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Date:	Wed, 1 Aug 2012 09:29:52 +0530
From:	Sachin Kamat <sachin.kamat@...aro.org>
To:	Jingoo Han <jg1.han@...sung.com>
Cc:	Damien Cassou <damien.cassou@...l.fr>,
	kernel-janitors@...r.kernel.org,
	Florian Tobias Schandinat <FlorianSchandinat@....de>,
	linux-fbdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 5/5] drivers/video/exynos/exynos_dp_core.c: use devm_ functions

On 1 August 2012 04:51, Jingoo Han <jg1.han@...sung.com> wrote:
> On Wednesday, August 01, 2012 1:39 AM Damien Cassou wrote:
>>
>> From: Damien Cassou <damien.cassou@...l.fr>
>>
>> The various devm_ functions allocate memory that is released when a driver
>> detaches.  This patch uses these functions for data that is allocated in
>> the probe function of a platform device and is only freed in the remove
>> function.
>>
>> Signed-off-by: Damien Cassou <damien.cassou@...l.fr>
>>
>> ---
>>  drivers/video/exynos/exynos_dp_core.c |   27 +++++++--------------------
>>  1 file changed, 7 insertions(+), 20 deletions(-)
>>
>> diff --git a/drivers/video/exynos/exynos_dp_core.c b/drivers/video/exynos/exynos_dp_core.c
>> index c6c016a..00fe4f0 100644
>> --- a/drivers/video/exynos/exynos_dp_core.c
>> +++ b/drivers/video/exynos/exynos_dp_core.c
>> @@ -872,7 +872,7 @@ static int __devinit exynos_dp_probe(struct platform_device *pdev)
>>
>>       dp->dev = &pdev->dev;
>>
>> -     dp->clock = clk_get(&pdev->dev, "dp");
>> +     dp->clock = devm_clk_get(&pdev->dev, "dp");
>>       if (IS_ERR(dp->clock)) {
>>               dev_err(&pdev->dev, "failed to get clock\n");
>>               return PTR_ERR(dp->clock);
>> @@ -881,31 +881,24 @@ static int __devinit exynos_dp_probe(struct platform_device *pdev)
>>       clk_enable(dp->clock);
>>
>>       res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>> -     if (!res) {
>> -             dev_err(&pdev->dev, "failed to get registers\n");
>> -             ret = -EINVAL;
>> -             goto err_clock;
>> -     }
>
> Why do you remove this return check?
> If there is no reason, please, do it as follows:
>
>         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>         if (!res) {
>                 dev_err(&pdev->dev, "failed to get registers\n");
> -               ret = -EINVAL;
> -               goto err_clock;
> +               return -EINVAL;
>         }
>
>

devm_request_and_ioremap function checks the validity of res. Hence
this check above is redundant and can be removed.

Damien,
This patch only adds devm_clk_get() function. Hence you could make the
subject line more specific.




> Best regards,
> Jingoo Han
>
>
>>
>>       dp->reg_base = devm_request_and_ioremap(&pdev->dev, res);
>>       if (!dp->reg_base) {
>>               dev_err(&pdev->dev, "failed to ioremap\n");
>> -             ret = -ENOMEM;
>> -             goto err_clock;
>> +             return -ENOMEM;
>>       }
>>
>>       dp->irq = platform_get_irq(pdev, 0);
>>       if (!dp->irq) {
>>               dev_err(&pdev->dev, "failed to get irq\n");
>> -             ret = -ENODEV;
>> -             goto err_clock;
>> +             return -ENODEV;
>>       }
>>
>>       ret = devm_request_irq(&pdev->dev, dp->irq, exynos_dp_irq_handler, 0,
>>                               "exynos-dp", dp);
>>       if (ret) {
>>               dev_err(&pdev->dev, "failed to request irq\n");
>> -             goto err_clock;
>> +             return ret;
>>       }
>>
>>       dp->video_info = pdata->video_info;
>> @@ -917,7 +910,7 @@ static int __devinit exynos_dp_probe(struct platform_device *pdev)
>>       ret = exynos_dp_detect_hpd(dp);
>>       if (ret) {
>>               dev_err(&pdev->dev, "unable to detect hpd\n");
>> -             goto err_clock;
>> +             return ret;
>>       }
>>
>>       exynos_dp_handle_edid(dp);
>> @@ -926,7 +919,7 @@ static int __devinit exynos_dp_probe(struct platform_device *pdev)
>>                               dp->video_info->link_rate);
>>       if (ret) {
>>               dev_err(&pdev->dev, "unable to do link train\n");
>> -             goto err_clock;
>> +             return ret;
>>       }
>>
>>       exynos_dp_enable_scramble(dp, 1);
>> @@ -940,17 +933,12 @@ static int __devinit exynos_dp_probe(struct platform_device *pdev)
>>       ret = exynos_dp_config_video(dp, dp->video_info);
>>       if (ret) {
>>               dev_err(&pdev->dev, "unable to config video\n");
>> -             goto err_clock;
>> +             return ret;
>>       }
>>
>>       platform_set_drvdata(pdev, dp);
>>
>>       return 0;
>> -
>> -err_clock:
>> -     clk_put(dp->clock);
>> -
>> -     return ret;
>>  }
>>
>>  static int __devexit exynos_dp_remove(struct platform_device *pdev)
>> @@ -962,7 +950,6 @@ static int __devexit exynos_dp_remove(struct platform_device *pdev)
>>               pdata->phy_exit();
>>
>>       clk_disable(dp->clock);
>> -     clk_put(dp->clock);
>>
>>       return 0;
>>  }
>
> --
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-- 
With warm regards,
Sachin
--
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