linux-kernel - Re: [PATCH v1 2/5] extcon: Return -EPROBE_DEFER when extcon device is not found

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Message-ID: <45b05f7f-26e4-8137-febc-de12848d30b0@roeck-us.net>
Date:   Sat, 10 Nov 2018 10:39:45 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        MyungJoo Ham <myungjoo.ham@...sung.com>,
        Chanwoo Choi <cw00.choi@...sung.com>,
        linux-usb@...r.kernel.org, Felipe Balbi <balbi@...nel.org>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Roger Quadros <rogerq@...com>, linux-pm@...r.kernel.org,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Sebastian Reichel <sre@...nel.org>, linux-omap@...r.kernel.org,
        Darren Hart <dvhart@...radead.org>,
        platform-driver-x86@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org, Chen-Yu Tsai <wens@...e.org>,
        Hans de Goede <hdegoede@...hat.com>
Subject: Re: [PATCH v1 2/5] extcon: Return -EPROBE_DEFER when extcon device is
 not found

On 11/10/18 10:10 AM, Andy Shevchenko wrote:
> All current users of extcon_get_extcon_dev() API considers
> an extcon device a mandatory to appear. Thus, they all convert
> NULL pointer to -EPROBE_DEFER error code.
> 
> There is one more caller anticipated with the same requirements.
> 
> To decrease a code duplication and a burden to the callers,
> return -EPROBE_DEFER directly from extcon_get_extcon_dev().
> 
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>

Acked-by: Guenter Roeck <linux@...ck-us.net>

> ---
>   drivers/extcon/extcon-axp288.c        | 4 ++--
>   drivers/extcon/extcon.c               | 2 +-
>   drivers/power/supply/axp288_charger.c | 8 ++++----
>   drivers/usb/phy/phy-omap-otg.c        | 6 +++---
>   drivers/usb/typec/tcpm/fusb302.c      | 4 ++--
>   5 files changed, 12 insertions(+), 12 deletions(-)
> 
> diff --git a/drivers/extcon/extcon-axp288.c b/drivers/extcon/extcon-axp288.c
> index a983708b77a6..3472d3b756ed 100644
> --- a/drivers/extcon/extcon-axp288.c
> +++ b/drivers/extcon/extcon-axp288.c
> @@ -360,8 +360,8 @@ static int axp288_extcon_probe(struct platform_device *pdev)
>   		name = acpi_dev_get_first_match_name("INT3496", NULL, -1);
>   		if (name) {
>   			info->id_extcon = extcon_get_extcon_dev(name);
> -			if (!info->id_extcon)
> -				return -EPROBE_DEFER;
> +			if (IS_ERR(info->id_extcon))
> +				return PTR_ERR(info->id_extcon);
>   
>   			dev_info(dev, "controlling USB role\n");
>   		} else {
> diff --git a/drivers/extcon/extcon.c b/drivers/extcon/extcon.c
> index 5ab0498be652..2bd0f2f33f05 100644
> --- a/drivers/extcon/extcon.c
> +++ b/drivers/extcon/extcon.c
> @@ -884,7 +884,7 @@ struct extcon_dev *extcon_get_extcon_dev(const char *extcon_name)
>   		if (!strcmp(sd->name, extcon_name))
>   			goto out;
>   	}
> -	sd = NULL;
> +	sd = ERR_PTR(-EPROBE_DEFER);
>   out:
>   	mutex_unlock(&extcon_dev_list_lock);
>   	return sd;
> diff --git a/drivers/power/supply/axp288_charger.c b/drivers/power/supply/axp288_charger.c
> index 735658ee1c60..8558577fccf5 100644
> --- a/drivers/power/supply/axp288_charger.c
> +++ b/drivers/power/supply/axp288_charger.c
> @@ -768,17 +768,17 @@ static int axp288_charger_probe(struct platform_device *pdev)
>   	info->regmap_irqc = axp20x->regmap_irqc;
>   
>   	info->cable.edev = extcon_get_extcon_dev(AXP288_EXTCON_DEV_NAME);
> -	if (info->cable.edev == NULL) {
> +	if (IS_ERR(info->cable.edev)) {
>   		dev_dbg(&pdev->dev, "%s is not ready, probe deferred\n",
>   			AXP288_EXTCON_DEV_NAME);
> -		return -EPROBE_DEFER;
> +		return PTR_ERR(info->cable.edev);
>   	}
>   
>   	if (acpi_dev_present(USB_HOST_EXTCON_HID, NULL, -1)) {
>   		info->otg.cable = extcon_get_extcon_dev(USB_HOST_EXTCON_NAME);
> -		if (info->otg.cable == NULL) {
> +		if (IS_ERR(info->otg.cable)) {
>   			dev_dbg(dev, "EXTCON_USB_HOST is not ready, probe deferred\n");
> -			return -EPROBE_DEFER;
> +			return PTR_ERR(info->otg.cable);
>   		}
>   		dev_info(&pdev->dev,
>   			 "Using " USB_HOST_EXTCON_HID " extcon for usb-id\n");
> diff --git a/drivers/usb/phy/phy-omap-otg.c b/drivers/usb/phy/phy-omap-otg.c
> index ee0863c6553e..605314ddcd3d 100644
> --- a/drivers/usb/phy/phy-omap-otg.c
> +++ b/drivers/usb/phy/phy-omap-otg.c
> @@ -91,12 +91,12 @@ static int omap_otg_probe(struct platform_device *pdev)
>   	int ret;
>   	u32 rev;
>   
> -	if (!config || !config->extcon)
> +	if (!config)
>   		return -ENODEV;
>   
>   	extcon = extcon_get_extcon_dev(config->extcon);
> -	if (!extcon)
> -		return -EPROBE_DEFER;
> +	if (IS_ERR(extcon))
> +		return PTR_ERR(extcon);
>   
>   	otg_dev = devm_kzalloc(&pdev->dev, sizeof(*otg_dev), GFP_KERNEL);
>   	if (!otg_dev)
> diff --git a/drivers/usb/typec/tcpm/fusb302.c b/drivers/usb/typec/tcpm/fusb302.c
> index 43b64d9309d0..6d332066202b 100644
> --- a/drivers/usb/typec/tcpm/fusb302.c
> +++ b/drivers/usb/typec/tcpm/fusb302.c
> @@ -1767,8 +1767,8 @@ static int fusb302_probe(struct i2c_client *client,
>   	 */
>   	if (device_property_read_string(dev, "fcs,extcon-name", &name) == 0) {
>   		chip->extcon = extcon_get_extcon_dev(name);
> -		if (!chip->extcon)
> -			return -EPROBE_DEFER;
> +		if (IS_ERR(chip->extcon))
> +			return PTR_ERR(chip->extcon);
>   	}
>   
>   	chip->vbus = devm_regulator_get(chip->dev, "vbus");
>