linux-kernel - Re: [PATCH 1/7] media: davinci: vpif: remove unwanted header includes

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Date:	Thu, 16 May 2013 15:02:54 +0200
From:	Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:	Lad Prabhakar <prabhakar.csengg@...il.com>
Cc:	DLOS <davinci-linux-open-source@...ux.davincidsp.com>,
	LMML <linux-media@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Mauro Carvalho Chehab <mchehab@...hat.com>,
	Hans Verkuil <hans.verkuil@...co.com>
Subject: Re: [PATCH 1/7] media: davinci: vpif: remove unwanted header includes

Hi Prabhakar,

Thank you for the patch.

On Thursday 16 May 2013 18:28:16 Lad Prabhakar wrote:
> From: Lad, Prabhakar <prabhakar.csengg@...il.com>
> 
> Signed-off-by: Lad, Prabhakar <prabhakar.csengg@...il.com>
> ---
>  drivers/media/platform/davinci/vpif.c |    7 -------
>  1 files changed, 0 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/media/platform/davinci/vpif.c
> b/drivers/media/platform/davinci/vpif.c index ea82a8b..d354d50 100644
> --- a/drivers/media/platform/davinci/vpif.c
> +++ b/drivers/media/platform/davinci/vpif.c
> @@ -17,18 +17,11 @@
>   * GNU General Public License for more details.
>   */
> 
> -#include <linux/init.h>
>  #include <linux/module.h>
>  #include <linux/platform_device.h>
> -#include <linux/spinlock.h>
> -#include <linux/kernel.h>
> -#include <linux/io.h>
> -#include <linux/err.h>
>  #include <linux/pm_runtime.h>
>  #include <linux/v4l2-dv-timings.h>

I think you should keep most of those includes. For instance this file uses 
spinlock functions, so linux/spinlock.h should be included. It might work fine 
now due to nested includes, but if someone reorganizes the kernel headers 
internal includes then the driver might break. As a general rule of good 
practice you should include headers for all the APIs you use.

> 
> -#include <mach/hardware.h>
> -
>  #include "vpif.h"
> 
>  MODULE_DESCRIPTION("TI DaVinci Video Port Interface driver");
-- 
Regards,

Laurent Pinchart

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