linux-kernel - Re: [PATCH] media: staging: rkisp1: avoid unused variable warning

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Message-ID: <20200408160806.GJ4881@pendragon.ideasonboard.com>
Date:   Wed, 8 Apr 2020 19:08:06 +0300
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        Helen Koike <helen.koike@...labora.com>,
        Jacob Chen <jacob2.chen@...k-chips.com>,
        Shunqian Zheng <zhengsq@...k-chips.com>,
        Yichong Zhong <zyc@...k-chips.com>,
        Jacob Chen <cc@...k-chips.com>,
        Eddie Cai <eddie.cai.linux@...il.com>,
        Jeffy Chen <jeffy.chen@...k-chips.com>,
        Allon Huang <allon.huang@...k-chips.com>,
        Tomasz Figa <tfiga@...omium.org>,
        Ezequiel Garcia <ezequiel@...labora.com>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Heiko Stuebner <heiko@...ech.de>,
        Dafna Hirschfeld <dafna.hirschfeld@...labora.com>,
        linux-media@...r.kernel.org, devel@...verdev.osuosl.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] media: staging: rkisp1: avoid unused variable warning

Hi Arnd,

Thank you for the patch.

On Wed, Apr 08, 2020 at 05:52:44PM +0200, Arnd Bergmann wrote:
> When compile-testing with CONFIG_OF disabled, we get a warning
> about an unused variable, and about inconsistent Kconfig dependencies:
> 
> WARNING: unmet direct dependencies detected for PHY_ROCKCHIP_DPHY_RX0
>   Depends on [n]: STAGING [=y] && STAGING_MEDIA [=y] && MEDIA_SUPPORT [=m] && (ARCH_ROCKCHIP [=n] || COMPILE_TEST [=y]) && OF [=n]
>   Selected by [m]:
>   - VIDEO_ROCKCHIP_ISP1 [=m] && STAGING [=y] && STAGING_MEDIA [=y] && MEDIA_SUPPORT [=m] && VIDEO_V4L2 [=m] && VIDEO_V4L2_SUBDEV_API [=y] && (ARCH_ROCKCHIP [=n] || COMPILE_TEST [=y])
> 
> drivers/staging/media/rkisp1/rkisp1-dev.c: In function 'rkisp1_probe':
> drivers/staging/media/rkisp1/rkisp1-dev.c:457:22: error: unused variable 'node' [-Werror=unused-variable]
>   457 |  struct device_node *node = pdev->dev.of_node;
> 
> Simply open-coding the pointer dereference in the only place
> the variable is used avoids the warning in all configurations,
> so we can allow compile-testing as well.
> 
> Fixes: d65dd85281fb ("media: staging: rkisp1: add Rockchip ISP1 base driver")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>

> ---
>  drivers/staging/media/phy-rockchip-dphy-rx0/Kconfig | 2 +-
>  drivers/staging/media/rkisp1/rkisp1-dev.c           | 3 +--
>  2 files changed, 2 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/staging/media/phy-rockchip-dphy-rx0/Kconfig b/drivers/staging/media/phy-rockchip-dphy-rx0/Kconfig
> index bd0147624de1..dd5d4d741bdd 100644
> --- a/drivers/staging/media/phy-rockchip-dphy-rx0/Kconfig
> +++ b/drivers/staging/media/phy-rockchip-dphy-rx0/Kconfig
> @@ -2,7 +2,7 @@
>  
>  config PHY_ROCKCHIP_DPHY_RX0
>  	tristate "Rockchip MIPI Synopsys DPHY RX0 driver"
> -	depends on (ARCH_ROCKCHIP || COMPILE_TEST) && OF
> +	depends on (ARCH_ROCKCHIP && OF) || COMPILE_TEST
>  	select GENERIC_PHY_MIPI_DPHY
>  	select GENERIC_PHY
>  	help
> diff --git a/drivers/staging/media/rkisp1/rkisp1-dev.c b/drivers/staging/media/rkisp1/rkisp1-dev.c
> index b1b3c058e957..5e7e797aad71 100644
> --- a/drivers/staging/media/rkisp1/rkisp1-dev.c
> +++ b/drivers/staging/media/rkisp1/rkisp1-dev.c
> @@ -454,7 +454,6 @@ static void rkisp1_debug_init(struct rkisp1_device *rkisp1)
>  
>  static int rkisp1_probe(struct platform_device *pdev)
>  {
> -	struct device_node *node = pdev->dev.of_node;
>  	const struct rkisp1_match_data *clk_data;
>  	const struct of_device_id *match;
>  	struct device *dev = &pdev->dev;
> @@ -463,7 +462,7 @@ static int rkisp1_probe(struct platform_device *pdev)
>  	unsigned int i;
>  	int ret, irq;
>  
> -	match = of_match_node(rkisp1_of_match, node);
> +	match = of_match_node(rkisp1_of_match, pdev->dev.of_node);
>  	rkisp1 = devm_kzalloc(dev, sizeof(*rkisp1), GFP_KERNEL);
>  	if (!rkisp1)
>  		return -ENOMEM;

-- 
Regards,

Laurent Pinchart