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

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Date:   Sat, 10 Nov 2018 20:10:58 +0200
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     MyungJoo Ham <myungjoo.ham@...sung.com>,
        Chanwoo Choi <cw00.choi@...sung.com>,
        linux-usb@...r.kernel.org, Felipe Balbi <balbi@...nel.org>,
        Guenter Roeck <linux@...ck-us.net>,
        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>
Cc:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Subject: [PATCH v1 2/5] extcon: Return -EPROBE_DEFER when extcon device is not found

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>
---
 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");
-- 
2.19.1