linux-kernel - Re: [PATCH] media: i2c: imx290: fix conditional function defintions

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Message-ID: <20230320092231.GC4564@thinkpad>
Date:   Mon, 20 Mar 2023 14:52:31 +0530
From:   Manivannan Sadhasivam <mani@...nel.org>
To:     Arnd Bergmann <arnd@...nel.org>
Cc:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Alexander Stein <alexander.stein@...tq-group.com>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Arnd Bergmann <arnd@...db.de>,
        Dave Stevenson <dave.stevenson@...pberrypi.com>,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] media: i2c: imx290: fix conditional function defintions

On Tue, Feb 07, 2023 at 05:13:12PM +0100, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@...db.de>
> 
> The runtime suspend/resume functions are only referenced from the
> dev_pm_ops, but they use the old SET_RUNTIME_PM_OPS() helper
> that requires a __maybe_unused annotation to avoid a warning:
> 
> drivers/media/i2c/imx290.c:1082:12: error: unused function 'imx290_runtime_resume' [-Werror,-Wunused-function]
> static int imx290_runtime_resume(struct device *dev)
>            ^
> drivers/media/i2c/imx290.c:1090:12: error: unused function 'imx290_runtime_suspend' [-Werror,-Wunused-function]
> static int imx290_runtime_suspend(struct device *dev)
>            ^
> 
> Convert this to the new RUNTIME_PM_OPS() helper that so this
> is not required. To improve this further, also use the pm_ptr()
> helper that lets the dev_pm_ops get dropped entirely when
> CONFIG_PM is disabled.
> 
> A related mistake happened in the of_match_ptr() macro here, which
> like SET_RUNTIME_PM_OPS() requires the match table to be marked
> as __maybe_unused, though I could not reproduce building this without
> CONFIG_OF. Remove the of_match_ptr() here as there is no point in
> dropping the match table in configurations without CONFIG_OF.
> 
> Fixes: 02852c01f654 ("media: i2c: imx290: Initialize runtime PM before subdev")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Reviewed-by: Manivannan Sadhasivam <mani@...nel.org>

Thanks,
Mani

> ---
>  drivers/media/i2c/imx290.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/media/i2c/imx290.c b/drivers/media/i2c/imx290.c
> index 49d6c8bdec41..48ae2e0adf9e 100644
> --- a/drivers/media/i2c/imx290.c
> +++ b/drivers/media/i2c/imx290.c
> @@ -1098,7 +1098,7 @@ static int imx290_runtime_suspend(struct device *dev)
>  }
>  
>  static const struct dev_pm_ops imx290_pm_ops = {
> -	SET_RUNTIME_PM_OPS(imx290_runtime_suspend, imx290_runtime_resume, NULL)
> +	RUNTIME_PM_OPS(imx290_runtime_suspend, imx290_runtime_resume, NULL)
>  };
>  
>  /* ----------------------------------------------------------------------------
> @@ -1362,8 +1362,8 @@ static struct i2c_driver imx290_i2c_driver = {
>  	.remove = imx290_remove,
>  	.driver = {
>  		.name  = "imx290",
> -		.pm = &imx290_pm_ops,
> -		.of_match_table = of_match_ptr(imx290_of_match),
> +		.pm = pm_ptr(&imx290_pm_ops),
> +		.of_match_table = imx290_of_match,
>  	},
>  };
>  
> -- 
> 2.39.1
> 

-- 
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