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SubjectRe: [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@lip6.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@vista-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@vista-silicon.com>
> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.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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