Re: [PATCH v2 4/5] media: davinci: vpif_capture: Convert to devm_* api

[Laurent Pinchart]

Hi Prabhakar,

Thank you for the patch.

On Saturday 25 May 2013 22:06:35 Prabhakar Lad wrote:
> From: Lad, Prabhakar <prabhakar.csengg@xxxxxxxxx>
> 
> use devm_request_irq() instead of request_irq().
> This ensures more consistent error values and simplifies error paths.
> 
> use module_platform_driver to simplify the code.
> 
> Signed-off-by: Lad, Prabhakar <prabhakar.csengg@xxxxxxxxx>

There's two separate changes in this patch, could you split it in two if you 
resubmit the series ? It would then be good to work on removing the vpif_obj 
and vpif_dev global variables.

Same comment for patch 5/5.

> ---
>  drivers/media/platform/davinci/vpif_capture.c |   73 ++++------------------
>  1 files changed, 13 insertions(+), 60 deletions(-)
> 
> diff --git a/drivers/media/platform/davinci/vpif_capture.c
> b/drivers/media/platform/davinci/vpif_capture.c index caaf4fe..f37adf1
> 100644
> --- a/drivers/media/platform/davinci/vpif_capture.c
> +++ b/drivers/media/platform/davinci/vpif_capture.c
> @@ -2082,14 +2082,13 @@ static __init int vpif_probe(struct platform_device
> *pdev)
> 
>  	while ((res = platform_get_resource(pdev, IORESOURCE_IRQ, res_idx))) {
>  		for (i = res->start; i <= res->end; i++) {
> -			if (request_irq(i, vpif_channel_isr, IRQF_SHARED,
> -					"VPIF_Capture", (void *)
> -					(&vpif_obj.dev[res_idx]->channel_id))) {
> -				err = -EBUSY;
> -				for (j = 0; j < i; j++)
> -					free_irq(j, (void *)
> -					(&vpif_obj.dev[res_idx]->channel_id));
> -				goto vpif_int_err;
> +			err = devm_request_irq(&pdev->dev, i, vpif_channel_isr,
> +					     IRQF_SHARED, "VPIF_Capture",
> +					     (void *)(&vpif_obj.dev[res_idx]->
> +					     channel_id));
> +			if (err) {
> +				err = -EINVAL;
> +				goto vpif_unregister;
>  			}
>  		}
>  		res_idx++;
> @@ -2106,7 +2105,7 @@ static __init int vpif_probe(struct platform_device
> *pdev) video_device_release(ch->video_dev);
>  			}
>  			err = -ENOMEM;
> -			goto vpif_int_err;
> +			goto vpif_unregister;
>  		}
> 
>  		/* Initialize field of video device */
> @@ -2207,13 +2206,8 @@ vpif_sd_error:
>  		/* Note: does nothing if ch->video_dev == NULL */
>  		video_device_release(ch->video_dev);
>  	}
> -vpif_int_err:
> +vpif_unregister:
>  	v4l2_device_unregister(&vpif_obj.v4l2_dev);
> -	for (i = 0; i < res_idx; i++) {
> -		res = platform_get_resource(pdev, IORESOURCE_IRQ, i);
> -		for (j = res->start; j <= res->end; j++)
> -			free_irq(j, (void *)(&vpif_obj.dev[i]->channel_id));
> -	}
>  	return err;
>  }
> 
> @@ -2229,14 +2223,16 @@ static int vpif_remove(struct platform_device
> *device) struct channel_obj *ch;
> 
>  	v4l2_device_unregister(&vpif_obj.v4l2_dev);
> -
> +	kfree(vpif_obj.sd);
>  	/* un-register device */
>  	for (i = 0; i < VPIF_CAPTURE_MAX_DEVICES; i++) {
>  		/* Get the pointer to the channel object */
>  		ch = vpif_obj.dev[i];
>  		/* Unregister video device */
>  		video_unregister_device(ch->video_dev);
> +		kfree(vpif_obj.dev[i]);
>  	}
> +
>  	return 0;
>  }
> 
> @@ -2326,47 +2322,4 @@ static __refdata struct platform_driver vpif_driver =
> { .remove = vpif_remove,
>  };
> 
> -/**
> - * vpif_init: initialize the vpif driver
> - *
> - * This function registers device and driver to the kernel, requests irq
> - * handler and allocates memory
> - * for channel objects
> - */
> -static __init int vpif_init(void)
> -{
> -	return platform_driver_register(&vpif_driver);
> -}
> -
> -/**
> - * vpif_cleanup : This function clean up the vpif capture resources
> - *
> - * This will un-registers device and driver to the kernel, frees
> - * requested irq handler and de-allocates memory allocated for channel
> - * objects.
> - */
> -static void vpif_cleanup(void)
> -{
> -	struct platform_device *pdev;
> -	struct resource *res;
> -	int irq_num;
> -	int i = 0;
> -
> -	pdev = container_of(vpif_dev, struct platform_device, dev);
> -	while ((res = platform_get_resource(pdev, IORESOURCE_IRQ, i))) {
> -		for (irq_num = res->start; irq_num <= res->end; irq_num++)
> -			free_irq(irq_num,
> -				 (void *)(&vpif_obj.dev[i]->channel_id));
> -		i++;
> -	}
> -
> -	platform_driver_unregister(&vpif_driver);
> -
> -	kfree(vpif_obj.sd);
> -	for (i = 0; i < VPIF_CAPTURE_MAX_DEVICES; i++)
> -		kfree(vpif_obj.dev[i]);
> -}
> -
> -/* Function for module initialization and cleanup */
> -module_init(vpif_init);
> -module_exit(vpif_cleanup);
> +module_platform_driver(vpif_driver);
-- 
Regards,

Laurent Pinchart

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