linux-kernel - Re: [PATCH RESEND] media: cros-ec-cec: do not bail on device_init

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Date:   Mon, 22 Jun 2020 12:23:37 +0200
From:   Hans Verkuil <hverkuil-cisco@...all.nl>
To:     Dariusz Marcinkiewicz <darekm@...gle.com>,
        linux-media@...r.kernel.org
Cc:     narmstrong@...libre.com,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Benson Leung <bleung@...omium.org>,
        Enric Balletbo i Serra <enric.balletbo@...labora.com>,
        Guenter Roeck <groeck@...omium.org>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Lee Jones <lee.jones@...aro.org>,
        Sebastian Reichel <sre@...nel.org>,
        Dariusz Marcinkiewicz <darekm@...omium.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH RESEND] media: cros-ec-cec: do not bail on
 device_init_wakeup failure

On 22/06/2020 12:05, Dariusz Marcinkiewicz wrote:
> Do not fail probing when device_init_wakeup fails.
> 
> device_init_wakeup fails when the device is already enabled as wakeup
> device. Hence, the driver fails to probe the device if:
> - The device has already been enabled for wakeup (via e.g. sysfs)
> - The driver has been unloaded and is being loaded again.
> 
> This goal of the patch is to fix the above cases.
> 
> Overwhelming majority of the drivers do not check device_init_wakeup
> return value.
> 
> Signed-off-by: Dariusz Marcinkiewicz <darekm@...gle.com>

This can be CCed to stable, I guess?

Can you provide a Fixes: tag as well?

Regards,

	Hans

> ---
>  drivers/media/cec/platform/cros-ec/cros-ec-cec.c | 6 +-----
>  1 file changed, 1 insertion(+), 5 deletions(-)
> 
> diff --git a/drivers/media/cec/platform/cros-ec/cros-ec-cec.c b/drivers/media/cec/platform/cros-ec/cros-ec-cec.c
> index 0e7e2772f08f..2d95e16cd248 100644
> --- a/drivers/media/cec/platform/cros-ec/cros-ec-cec.c
> +++ b/drivers/media/cec/platform/cros-ec/cros-ec-cec.c
> @@ -277,11 +277,7 @@ static int cros_ec_cec_probe(struct platform_device *pdev)
>  	platform_set_drvdata(pdev, cros_ec_cec);
>  	cros_ec_cec->cros_ec = cros_ec;
>  
> -	ret = device_init_wakeup(&pdev->dev, 1);
> -	if (ret) {
> -		dev_err(&pdev->dev, "failed to initialize wakeup\n");
> -		return ret;
> -	}
> +	device_init_wakeup(&pdev->dev, 1);
>  
>  	cros_ec_cec->adap = cec_allocate_adapter(&cros_ec_cec_ops, cros_ec_cec,
>  						 DRV_NAME,
>