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

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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@xxxxxxxxxxxxxxx>

Acked-by: Guenter Roeck <linux@xxxxxxxxxxxx>

---
  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");





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