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Message-id: <1424692061-30624-13-git-send-email-k.kozlowski@samsung.com>
Date: Mon, 23 Feb 2015 12:47:33 +0100
From: Krzysztof Kozlowski <k.kozlowski@...sung.com>
To: Sebastian Reichel <sre@...nel.org>,
Dmitry Eremin-Solenikov <dbaryshkov@...il.com>,
David Woodhouse <dwmw2@...radead.org>,
linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
"Rafael J. Wysocki" <rjw@...ysocki.net>,
Len Brown <lenb@...nel.org>, Jiri Kosina <jkosina@...e.cz>,
David Herrmann <dh.herrmann@...glemail.com>,
Cezary Jackiewicz <cezary.jackiewicz@...il.com>,
Darren Hart <dvhart@...radead.org>,
Support Opensource <support.opensource@...semi.com>,
Milo Kim <milo.kim@...com>,
Julian Andres Klode <jak@...-linux.org>,
Marc Dietrich <marvin24@....de>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
linux-acpi@...r.kernel.org, linux-input@...r.kernel.org,
platform-driver-x86@...r.kernel.org,
patches@...nsource.wolfsonmicro.com, ac100@...ts.launchpad.net,
linux-tegra@...r.kernel.org, devel@...verdev.osuosl.org,
Linus Walleij <linus.walleij@...aro.org>,
Samuel Ortiz <sameo@...ux.intel.com>,
Lee Jones <lee.jones@...aro.org>,
linux-arm-kernel@...ts.infradead.org,
Ingo Molnar <mingo@...hat.com>,
"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
Daniel Mack <daniel@...que.org>,
Haojian Zhuang <haojian.zhuang@...il.com>,
Robert Jarzmik <robert.jarzmik@...e.fr>
Cc: Thomas Gleixner <tglx@...utronix.de>, Pavel Machek <pavel@....cz>,
Kyungmin Park <kyungmin.park@...sung.com>,
Marek Szyprowski <m.szyprowski@...sung.com>,
Krzysztof Kozlowski <k.kozlowski@...sung.com>
Subject: [PATCH v4 12/20] power_supply: Add power_supply_put for decrementing
device reference counter
The power_supply_get_by_phandle() and power_supply_get_by_name() use
function class_find_device() for obtaining the reference to power
supply. Each use of class_find_device() increases the power supply's
device reference counter.
However the reference counter was not decreased by users of this API.
Thus final device_unregister() call from power_supply_unregister() could
not release the device and clean up its resources. This lead to memory
leak if at least once power_supply_get_by_*() was called between
registering and unregistering the power supply.
Add and document new API power_supply_put() for decrementing the
reference counter.
Signed-off-by: Krzysztof Kozlowski <k.kozlowski@...sung.com>
Acked-by: Pavel Machek <pavel@....cz>
Reviewed-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
Reviewed-by: Sebastian Reichel <sre@...nel.org>
---
drivers/power/power_supply_core.c | 38 ++++++++++++++++++++++++++++++++++++++
include/linux/power_supply.h | 1 +
2 files changed, 39 insertions(+)
diff --git a/drivers/power/power_supply_core.c b/drivers/power/power_supply_core.c
index 7f437f66076c..a94f8c9d5e1e 100644
--- a/drivers/power/power_supply_core.c
+++ b/drivers/power/power_supply_core.c
@@ -336,6 +336,17 @@ static int power_supply_match_device_by_name(struct device *dev, const void *dat
return strcmp(psy->desc->name, name) == 0;
}
+/**
+ * power_supply_get_by_name() - Search for a power supply and returns its ref
+ * @name: Power supply name to fetch
+ *
+ * If power supply was found, it increases reference count for the
+ * internal power supply's device. The user should power_supply_put()
+ * after usage.
+ *
+ * Return: On success returns a reference to a power supply with
+ * matching name equals to @name, a NULL otherwise.
+ */
struct power_supply *power_supply_get_by_name(const char *name)
{
struct device *dev = class_find_device(power_supply_class, NULL, name,
@@ -345,12 +356,39 @@ struct power_supply *power_supply_get_by_name(const char *name)
}
EXPORT_SYMBOL_GPL(power_supply_get_by_name);
+/**
+ * power_supply_put() - Drop reference obtained with power_supply_get_by_name
+ * @psy: Reference to put
+ *
+ * The reference to power supply should be put before unregistering
+ * the power supply.
+ */
+void power_supply_put(struct power_supply *psy)
+{
+ might_sleep();
+
+ put_device(&psy->dev);
+}
+EXPORT_SYMBOL_GPL(power_supply_put);
+
#ifdef CONFIG_OF
static int power_supply_match_device_node(struct device *dev, const void *data)
{
return dev->parent && dev->parent->of_node == data;
}
+/**
+ * power_supply_get_by_phandle() - Search for a power supply and returns its ref
+ * @np: Pointer to device node holding phandle property
+ * @phandle_name: Name of property holding a power supply name
+ *
+ * If power supply was found, it increases reference count for the
+ * internal power supply's device. The user should power_supply_put()
+ * after usage.
+ *
+ * Return: On success returns a reference to a power supply with
+ * matching name equals to value under @property, NULL or ERR_PTR otherwise.
+ */
struct power_supply *power_supply_get_by_phandle(struct device_node *np,
const char *property)
{
diff --git a/include/linux/power_supply.h b/include/linux/power_supply.h
index 54ebac5e3fe3..7000a4927ac8 100644
--- a/include/linux/power_supply.h
+++ b/include/linux/power_supply.h
@@ -282,6 +282,7 @@ extern struct atomic_notifier_head power_supply_notifier;
extern int power_supply_reg_notifier(struct notifier_block *nb);
extern void power_supply_unreg_notifier(struct notifier_block *nb);
extern struct power_supply *power_supply_get_by_name(const char *name);
+extern void power_supply_put(struct power_supply *psy);
#ifdef CONFIG_OF
extern struct power_supply *power_supply_get_by_phandle(struct device_node *np,
const char *property);
--
1.9.1
--
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