linux-kernel - Re: [PATCH] drivers/media/video/mx2_emmaprp.c: use devm_kzalloc and devm_clk

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Message-ID: <alpine.DEB.2.02.1208132157120.2355@localhost6.localdomain6>
Date:	Mon, 13 Aug 2012 21:57:40 +0200 (CEST)
From:	Julia Lawall <julia.lawall@...6.fr>
To:	Mauro Carvalho Chehab <mchehab@...hat.com>
cc:	Julia Lawall <julia.lawall@...6.fr>,
	Lars-Peter Clausen <lars@...afoo.de>,
	Dan Carpenter <dan.carpenter@...cle.com>,
	Mauro Carvalho Chehab <mchehab@...radead.org>,
	kernel-janitors@...r.kernel.org, linux-media@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drivers/media/video/mx2_emmaprp.c: use devm_kzalloc and
 devm_clk_get

On Mon, 13 Aug 2012, Mauro Carvalho Chehab wrote:

> Em 10-08-2012 10:59, Julia Lawall escreveu:
>> From: Julia Lawall <Julia.Lawall@...6.fr>
>>
>> Using devm_kzalloc and devm_clk_get simplifies the code and ensures that
>> the use of devm_request_irq is safe.  When kzalloc and kfree were used, the
>> interrupt could be triggered after the handler's data argument had been
>> freed.
>>
>> Add missing return code initializations in the error handling code for
>> devm_request_and_ioremap and devm_request_irq.
>>
>> The problem of a free after a devm_request_irq was found using the
>> following semantic match (http://coccinelle.lip6.fr/)
>
> Hi Julia,
>
> This patch doesn't apply anymore, likely due to this changeset:

OK, I'll fix it.  Indeed, devm_clk_get is already introduced by this 
patch.

julia

> commit 33eb46a7c2bdd10f9a761390ce1bf51169ff537a
> Author: Javier Martin <javier.martin@...ta-silicon.com>
> Date:   Mon Jul 30 04:37:30 2012 -0300
>
>    [media] media: i.MX27: Fix mx2_emmaprp mem2mem driver clocks
>
>    This driver wasn't converted to the new clock framework
>    (e038ed50a4a767add205094c035b6943e7b30140).
>
>    Signed-off-by: Javier Martin <javier.martin@...ta-silicon.com>
>    Signed-off-by: Mauro Carvalho Chehab <mchehab@...hat.com>
>
> diff --git a/drivers/media/video/mx2_emmaprp.c b/drivers/media/video/mx2_emmaprp.c
> index 5f8a6f5..728cac3 100644
> --- a/drivers/media/video/mx2_emmaprp.c
> +++ b/drivers/media/video/mx2_emmaprp.c
> @@ -209,7 +209,7 @@ struct emmaprp_dev {
>
> 	int			irq_emma;
> 	void __iomem		*base_emma;
> -	struct clk		*clk_emma;
> +	struct clk		*clk_emma_ahb, *clk_emma_ipg;
> 	struct resource		*res_emma;
>
> 	struct v4l2_m2m_dev	*m2m_dev;
> @@ -804,7 +804,8 @@ static int emmaprp_open(struct file *file)
> 		return ret;
> 	}
>
> -	clk_enable(pcdev->clk_emma);
> +	clk_prepare_enable(pcdev->clk_emma_ipg);
> +	clk_prepare_enable(pcdev->clk_emma_ahb);
> 	ctx->q_data[V4L2_M2M_SRC].fmt = &formats[1];
> 	ctx->q_data[V4L2_M2M_DST].fmt = &formats[0];
>
> @@ -820,7 +821,8 @@ static int emmaprp_release(struct file *file)
>
> 	dprintk(pcdev, "Releasing instance %p\n", ctx);
>
> -	clk_disable(pcdev->clk_emma);
> +	clk_disable_unprepare(pcdev->clk_emma_ahb);
> +	clk_disable_unprepare(pcdev->clk_emma_ipg);
> 	v4l2_m2m_ctx_release(ctx->m2m_ctx);
> 	kfree(ctx);
>
> @@ -880,9 +882,15 @@ static int emmaprp_probe(struct platform_device *pdev)
>
> 	spin_lock_init(&pcdev->irqlock);
>
> -	pcdev->clk_emma = clk_get(&pdev->dev, NULL);
> -	if (IS_ERR(pcdev->clk_emma)) {
> -		ret = PTR_ERR(pcdev->clk_emma);
> +	pcdev->clk_emma_ipg = devm_clk_get(&pdev->dev, "ipg");
> +	if (IS_ERR(pcdev->clk_emma_ipg)) {
> +		ret = PTR_ERR(pcdev->clk_emma_ipg);
> +		goto free_dev;
> +	}
> +
> +	pcdev->clk_emma_ahb = devm_clk_get(&pdev->dev, "ahb");
> +	if (IS_ERR(pcdev->clk_emma_ipg)) {
> +		ret = PTR_ERR(pcdev->clk_emma_ahb);
> 		goto free_dev;
> 	}
>
> @@ -891,12 +899,12 @@ static int emmaprp_probe(struct platform_device *pdev)
> 	if (irq_emma < 0 || res_emma == NULL) {
> 		dev_err(&pdev->dev, "Missing platform resources data\n");
> 		ret = -ENODEV;
> -		goto free_clk;
> +		goto free_dev;
> 	}
>
> 	ret = v4l2_device_register(&pdev->dev, &pcdev->v4l2_dev);
> 	if (ret)
> -		goto free_clk;
> +		goto free_dev;
>
> 	mutex_init(&pcdev->dev_mutex);
>
> @@ -969,8 +977,6 @@ rel_vdev:
> 	video_device_release(vfd);
> unreg_dev:
> 	v4l2_device_unregister(&pcdev->v4l2_dev);
> -free_clk:
> -	clk_put(pcdev->clk_emma);
> free_dev:
> 	kfree(pcdev);
>
> @@ -987,7 +993,6 @@ static int emmaprp_remove(struct platform_device *pdev)
> 	v4l2_m2m_release(pcdev->m2m_dev);
> 	vb2_dma_contig_cleanup_ctx(pcdev->alloc_ctx);
> 	v4l2_device_unregister(&pcdev->v4l2_dev);
> -	clk_put(pcdev->clk_emma);
> 	kfree(pcdev);
>
> 	return 0;
>
> --
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