linux-kernel - Re: [PATCH v2] video: add OpenCores VGA/LCD framebuffer driver

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Date:	Wed, 20 Nov 2013 15:20:28 +0900
From:	Jingoo Han <jg1.han@...sung.com>
To:	'Stefan Kristiansson' <stefan.kristiansson@...nalahti.fi>
Cc:	linux-kernel@...r.kernel.org, linux-fbdev@...r.kernel.org,
	'Tomi Valkeinen' <tomi.valkeinen@...com>,
	'Jean-Christophe PLAGNIOL-VILLARD' <plagnioj@...osoft.com>,
	'Jingoo Han' <jg1.han@...sung.com>
Subject: Re: [PATCH v2] video: add OpenCores VGA/LCD framebuffer driver

On Wednesday, November 20, 2013 1:14 PM, Stefan Kristiansson wrote:
> 
> This adds support for the VGA/LCD core available from OpenCores:
> http://opencores.org/project,vga_lcd
> 
> The driver have been tested together with both OpenRISC and
> ARM (socfpga) processors.
> 
> Signed-off-by: Stefan Kristiansson <stefan.kristiansson@...nalahti.fi>
> ---
> Changes in v2:
> - Add Microblaze as an example user and fix a typo in Xilinx Zynq
> ---
>  drivers/video/Kconfig  |  17 ++
>  drivers/video/Makefile |   1 +
>  drivers/video/ocfb.c   | 479 +++++++++++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 497 insertions(+)
>  create mode 100644 drivers/video/ocfb.c
> 

Hi Stefan Kristiansson,

I added trivial comments as below.

[.....]

> --- /dev/null
> +++ b/drivers/video/ocfb.c

[.....]

> +static int ocfb_probe(struct platform_device *pdev)
> +{
> +	int ret = 0;
> +	struct ocfb_dev *fbdev;
> +	struct ocfb_par *par = &ocfb_par_priv;
> +	struct resource *res;
> +	struct resource *mmio;
> +	int fbsize;
> +
> +	fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);

Please use devm_kzalloc() instead of kzalloc().
In this case, kfree() can be removed from ocfb_probe()
and ocfb_remove(). Thus, it will make the code smaller.

[.....]

> +
> +#ifdef MODULE

I don't think that '#ifdef MODULE' is necessary.
Is there any reason?

Best regards,
Jingoo Han

> +MODULE_AUTHOR("Stefan Kristiansson <stefan.kristiansson@...nalahti.fi>");
> +MODULE_DESCRIPTION("OpenCores VGA/LCD 2.0 frame buffer driver");
> +MODULE_LICENSE("GPL v2");
> +module_param(mode_option, charp, 0);
> +MODULE_PARM_DESC(mode_option, "Video mode ('<xres>x<yres>[-<bpp>][@refresh]')");
> +#endif
> --
> 1.8.3.2

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