linux-kernel - [PATCH 11/18] power: supply: Fix power_supply_am_i_supplied to return -ENODEV when apropriate

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Message-Id: <20170806123555.5124-12-hdegoede@redhat.com>
Date:   Sun,  6 Aug 2017 14:35:48 +0200
From:   Hans de Goede <hdegoede@...hat.com>
To:     Darren Hart <dvhart@...radead.org>,
        Andy Shevchenko <andy@...radead.org>,
        Wolfram Sang <wsa@...-dreams.de>,
        Sebastian Reichel <sre@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Guenter Roeck <linux@...ck-us.net>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>
Cc:     Hans de Goede <hdegoede@...hat.com>,
        platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-i2c@...r.kernel.org, Liam Breck <liam@...workimprov.net>,
        Tony Lindgren <tony@...mide.com>, linux-pm@...r.kernel.org,
        devel@...verdev.osuosl.org
Subject: [PATCH 11/18] power: supply: Fix power_supply_am_i_supplied to return -ENODEV when apropriate

Commit 2848e039c562 ("power: supply: Make power_supply_am_i_supplied return
-ENODEV if there are no suppliers") was supposed to make
power_supply_am_i_supplied() return -ENODEV when there are no supplies
which supply the supply passed to it.

But instead it will only return -ENODEV when there are no supplies at
all as data->count++; is incremented on every call of the iterator, rather
then only when __power_supply_is_supplied_by returns true. This commit
fixes this.

Fixes: 2848e039c562 ("power: supply: Make power_supply_am_i_supplied ...")
Signed-off-by: Hans de Goede <hdegoede@...hat.com>
---
 drivers/power/supply/power_supply_core.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/power/supply/power_supply_core.c b/drivers/power/supply/power_supply_core.c
index 540d3e0aa011..0741fcef3b44 100644
--- a/drivers/power/supply/power_supply_core.c
+++ b/drivers/power/supply/power_supply_core.c
@@ -314,11 +314,12 @@ static int __power_supply_am_i_supplied(struct device *dev, void *_data)
 	struct power_supply *epsy = dev_get_drvdata(dev);
 	struct psy_am_i_supplied_data *data = _data;
 
-	data->count++;
-	if (__power_supply_is_supplied_by(epsy, data->psy))
+	if (__power_supply_is_supplied_by(epsy, data->psy)) {
+		data->count++;
 		if (!epsy->desc->get_property(epsy, POWER_SUPPLY_PROP_ONLINE,
 					&ret))
 			return ret.intval;
+	}
 
 	return 0;
 }
-- 
2.13.3