power_supply: Change ownership from driver to core

Change the ownership of power_supply structure from each driver
implementing the class to the power supply core.

The patch changes power_supply_register() function thus all drivers
implementing power supply class are adjusted.

Each driver provides the implementation of power supply. However it
should not be the owner of power supply class instance because it is
exposed by core to other subsystems with power_supply_get_by_name().
These other subsystems have no knowledge when the driver will unregister
the power supply. This leads to several issues when driver is unbound -
mostly because user of power supply accesses freed memory.

Instead let the core own the instance of struct 'power_supply'.  Other
users of this power supply will still access valid memory because it
will be freed when device reference count reaches 0. Currently this
means "it will leak" but power_supply_put() call in next patches will
solve it.

This solves invalid memory references in following race condition
scenario:

Thread 1: charger manager
Thread 2: power supply driver, used by charger manager

THREAD 1 (charger manager)         THREAD 2 (power supply driver)
==========================         ==============================
psy = power_supply_get_by_name()
                                   Driver unbind, .remove
                                     power_supply_unregister()
                                     Device fully removed
psy->get_property()

The 'get_property' call is executed in invalid context because the driver was
unbound and struct 'power_supply' memory was freed.

This could be observed easily with charger manager driver (here compiled
with max17040 fuel gauge):

$ cat /sys/devices/virtual/power_supply/cm-battery/capacity &
$ echo "1-0036" > /sys/bus/i2c/drivers/max17040/unbind
[   55.725123] Unable to handle kernel NULL pointer dereference at virtual address 00000000
[   55.732584] pgd = d98d4000
[   55.734060] [00000000] *pgd=5afa2831, *pte=00000000, *ppte=00000000
[   55.740318] Internal error: Oops: 80000007 [#1] PREEMPT SMP ARM
[   55.746210] Modules linked in:
[   55.749259] CPU: 1 PID: 2936 Comm: cat Tainted: G        W       3.19.0-rc1-next-20141226-00048-gf79f475f3c44-dirty #1496
[   55.760190] Hardware name: SAMSUNG EXYNOS (Flattened Device Tree)
[   55.766270] task: d9b76f00 ti: daf54000 task.ti: daf54000
[   55.771647] PC is at 0x0
[   55.774182] LR is at charger_get_property+0x2f4/0x36c
[   55.779201] pc : [<00000000>]    lr : [<c034b0b4>]    psr: 60000013
[   55.779201] sp : daf55e90  ip : 00000003  fp : 00000000
[   55.790657] r10: 00000000  r9 : c06e2878  r8 : d9b26c68
[   55.795865] r7 : dad81610  r6 : daec7410  r5 : daf55ebc  r4 : 00000000
[   55.802367] r3 : 00000000  r2 : daf55ebc  r1 : 0000002a  r0 : d9b26c68
[   55.808879] Flags: nZCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment user
[   55.815994] Control: 10c5387d  Table: 598d406a  DAC: 00000015
[   55.821723] Process cat (pid: 2936, stack limit = 0xdaf54210)
[   55.827451] Stack: (0xdaf55e90 to 0xdaf56000)
[   55.831795] 5e80:                                     60000013 c01459c4 0000002a c06f8ef8
[   55.839956] 5ea0: db651000 c06f8ef8 daebac00 c04cb668 daebac08 c0346864 00000000 c01459c4
[   55.848115] 5ec0: d99eaa80 c06f8ef8 00000fff 00001000 db651000 c027f25c c027f240 d99eaa80
[   55.856274] 5ee0: d9a06c00 c0146218 daf55f18 00001000 d99eaa80 db4c18c0 00000001 00000001
[   55.864468] 5f00: daf55f80 c0144c78 c0144c54 c0107f90 00015000 d99eaab0 00000000 00000000
[   55.872603] 5f20: 000051c7 00000000 db4c18c0 c04a9370 00015000 00001000 daf55f80 00001000
[   55.880763] 5f40: daf54000 00015000 00000000 c00e53dc db4c18c0 c00e548c 0000000d 00008124
[   55.888937] 5f60: 00000001 00000000 00000000 db4c18c0 db4c18c0 00001000 00015000 c00e5550
[   55.897099] 5f80: 00000000 00000000 00001000 00001000 00015000 00000003 00000003 c000f364
[   55.905239] 5fa0: 00000000 c000f1a0 00001000 00015000 00000003 00015000 00001000 0001333c
[   55.913399] 5fc0: 00001000 00015000 00000003 00000003 00000002 00000000 00000000 00000000
[   55.921560] 5fe0: 7fffe000 be999850 0000a225 b6f3c19c 60000010 00000003 00000000 00000000
[   55.929744] [<c034b0b4>] (charger_get_property) from [<c0346864>] (power_supply_show_property+0x48/0x20c)
[   55.939286] [<c0346864>] (power_supply_show_property) from [<c027f25c>] (dev_attr_show+0x1c/0x48)
[   55.948130] [<c027f25c>] (dev_attr_show) from [<c0146218>] (sysfs_kf_seq_show+0x84/0x104)
[   55.956298] [<c0146218>] (sysfs_kf_seq_show) from [<c0144c78>] (kernfs_seq_show+0x24/0x28)
[   55.964536] [<c0144c78>] (kernfs_seq_show) from [<c0107f90>] (seq_read+0x1b0/0x484)
[   55.972172] [<c0107f90>] (seq_read) from [<c00e53dc>] (__vfs_read+0x18/0x4c)
[   55.979188] [<c00e53dc>] (__vfs_read) from [<c00e548c>] (vfs_read+0x7c/0x100)
[   55.986304] [<c00e548c>] (vfs_read) from [<c00e5550>] (SyS_read+0x40/0x8c)
[   55.993164] [<c00e5550>] (SyS_read) from [<c000f1a0>] (ret_fast_syscall+0x0/0x48)
[   56.000626] Code: bad PC value
[   56.011652] ---[ end trace 7b64343fbdae8ef1 ]---

Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Reviewed-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>

[for the nvec part]
Reviewed-by: Marc Dietrich <marvin24@gmx.de>

[for compal-laptop.c]
Acked-by: Darren Hart <dvhart@linux.intel.com>

[for the mfd part]
Acked-by: Lee Jones <lee.jones@linaro.org>

[for the hid part]
Acked-by: Jiri Kosina <jkosina@suse.cz>

[for the acpi part]
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

Signed-off-by: Sebastian Reichel <sre@kernel.org>

1 files changed, 43 insertions, 37 deletions

diff --git a/drivers/power/da9150-charger.c b/drivers/power/da9150-charger.c
index db8ba5d8d1e3..60099815296e 100644
--- a/drivers/power/da9150-charger.c
+++ b/drivers/power/da9150-charger.c
@@ -30,8 +30,8 @@ struct da9150_charger {
 	struct da9150 *da9150;
 	struct device *dev;
 
-	struct power_supply usb;
-	struct power_supply battery;
+	struct power_supply *usb;
+	struct power_supply *battery;
 	struct power_supply *supply_online;
 
 	struct usb_phy *usb_phy;
@@ -114,7 +114,7 @@ static int da9150_charger_get_prop(struct power_supply *psy,
 				   enum power_supply_property psp,
 				   union power_supply_propval *val)
 {
-	struct da9150_charger *charger = dev_get_drvdata(psy->dev->parent);
+	struct da9150_charger *charger = dev_get_drvdata(psy->dev.parent);
 	int ret;
 
 	switch (psp) {
@@ -326,7 +326,7 @@ static int da9150_charger_battery_get_prop(struct power_supply *psy,
 					   enum power_supply_property psp,
 					   union power_supply_propval *val)
 {
-	struct da9150_charger *charger = dev_get_drvdata(psy->dev->parent);
+	struct da9150_charger *charger = dev_get_drvdata(psy->dev.parent);
 	int ret;
 
 	switch (psp) {
@@ -369,7 +369,7 @@ static irqreturn_t da9150_charger_chg_irq(int irq, void *data)
 {
 	struct da9150_charger *charger = data;
 
-	power_supply_changed(&charger->battery);
+	power_supply_changed(charger->battery);
 
 	return IRQ_HANDLED;
 }
@@ -380,7 +380,7 @@ static irqreturn_t da9150_charger_tjunc_irq(int irq, void *data)
 
 	/* Nothing we can really do except report this. */
 	dev_crit(charger->dev, "TJunc over temperature!!!\n");
-	power_supply_changed(&charger->usb);
+	power_supply_changed(charger->usb);
 
 	return IRQ_HANDLED;
 }
@@ -391,8 +391,8 @@ static irqreturn_t da9150_charger_vfault_irq(int irq, void *data)
 
 	/* Nothing we can really do except report this. */
 	dev_crit(charger->dev, "VSYS under voltage!!!\n");
-	power_supply_changed(&charger->usb);
-	power_supply_changed(&charger->battery);
+	power_supply_changed(charger->usb);
+	power_supply_changed(charger->battery);
 
 	return IRQ_HANDLED;
 }
@@ -408,10 +408,10 @@ static irqreturn_t da9150_charger_vbus_irq(int irq, void *data)
 	switch (reg & DA9150_VBUS_STAT_MASK) {
 	case DA9150_VBUS_STAT_OFF:
 	case DA9150_VBUS_STAT_WAIT:
-		charger->supply_online = &charger->battery;
+		charger->supply_online = charger->battery;
 		break;
 	case DA9150_VBUS_STAT_CHG:
-		charger->supply_online = &charger->usb;
+		charger->supply_online = charger->usb;
 		break;
 	default:
 		dev_warn(charger->dev, "Unknown VBUS state - reg = 0x%x\n",
@@ -420,8 +420,8 @@ static irqreturn_t da9150_charger_vbus_irq(int irq, void *data)
 		break;
 	}
 
-	power_supply_changed(&charger->usb);
-	power_supply_changed(&charger->battery);
+	power_supply_changed(charger->usb);
+	power_supply_changed(charger->battery);
 
 	return IRQ_HANDLED;
 }
@@ -439,8 +439,8 @@ static void da9150_charger_otg_work(struct work_struct *data)
 		break;
 	case USB_EVENT_NONE:
 		/* Revert to charge mode */
-		power_supply_changed(&charger->usb);
-		power_supply_changed(&charger->battery);
+		power_supply_changed(charger->usb);
+		power_supply_changed(charger->battery);
 		da9150_set_bits(charger->da9150, DA9150_PPR_BKCTRL_A,
 				DA9150_VBUS_MODE_MASK, DA9150_VBUS_MODE_CHG);
 		break;
@@ -499,12 +499,27 @@ static void da9150_charger_unregister_irq(struct platform_device *pdev,
 	free_irq(irq, charger);
 }
 
+static const struct power_supply_desc usb_desc = {
+	.name		= "da9150-usb",
+	.type		= POWER_SUPPLY_TYPE_USB,
+	.properties	= da9150_charger_props,
+	.num_properties	= ARRAY_SIZE(da9150_charger_props),
+	.get_property	= da9150_charger_get_prop,
+};
+
+static const struct power_supply_desc battery_desc = {
+	.name		= "da9150-battery",
+	.type		= POWER_SUPPLY_TYPE_BATTERY,
+	.properties	= da9150_charger_bat_props,
+	.num_properties	= ARRAY_SIZE(da9150_charger_bat_props),
+	.get_property	= da9150_charger_battery_get_prop,
+};
+
 static int da9150_charger_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
 	struct da9150 *da9150 = dev_get_drvdata(dev->parent);
 	struct da9150_charger *charger;
-	struct power_supply *usb, *battery;
 	u8 reg;
 	int ret;
 
@@ -542,26 +557,17 @@ static int da9150_charger_probe(struct platform_device *pdev)
 	}
 
 	/* Register power supplies */
-	usb = &charger->usb;
-	battery = &charger->battery;
-
-	usb->name = "da9150-usb",
-	usb->type = POWER_SUPPLY_TYPE_USB;
-	usb->properties = da9150_charger_props;
-	usb->num_properties = ARRAY_SIZE(da9150_charger_props);
-	usb->get_property = da9150_charger_get_prop;
-	ret = power_supply_register(dev, usb, NULL);
-	if (ret)
+	charger->usb = power_supply_register(dev, &usb_desc, NULL);
+	if (IS_ERR(charger->usb)) {
+		ret = PTR_ERR(charger->usb);
 		goto usb_fail;
+	}
 
-	battery->name = "da9150-battery";
-	battery->type = POWER_SUPPLY_TYPE_BATTERY;
-	battery->properties = da9150_charger_bat_props;
-	battery->num_properties = ARRAY_SIZE(da9150_charger_bat_props);
-	battery->get_property = da9150_charger_battery_get_prop;
-	ret = power_supply_register(dev, battery, NULL);
-	if (ret)
+	charger->battery = power_supply_register(dev, &battery_desc, NULL);
+	if (IS_ERR(charger->battery)) {
+		ret = PTR_ERR(charger->battery);
 		goto battery_fail;
+	}
 
 	/* Get initial online supply */
 	reg = da9150_reg_read(da9150, DA9150_STATUS_H);
@@ -569,10 +575,10 @@ static int da9150_charger_probe(struct platform_device *pdev)
 	switch (reg & DA9150_VBUS_STAT_MASK) {
 	case DA9150_VBUS_STAT_OFF:
 	case DA9150_VBUS_STAT_WAIT:
-		charger->supply_online = &charger->battery;
+		charger->supply_online = charger->battery;
 		break;
 	case DA9150_VBUS_STAT_CHG:
-		charger->supply_online = &charger->usb;
+		charger->supply_online = charger->usb;
 		break;
 	default:
 		dev_warn(dev, "Unknown VBUS state - reg = 0x%x\n", reg);
@@ -622,7 +628,7 @@ chg_irq_fail:
 	if (!IS_ERR_OR_NULL(charger->usb_phy))
 		usb_unregister_notifier(charger->usb_phy, &charger->otg_nb);
 battery_fail:
-	power_supply_unregister(usb);
+	power_supply_unregister(charger->usb);
 
 usb_fail:
 	iio_channel_release(charger->vbat_chan);
@@ -661,8 +667,8 @@ static int da9150_charger_remove(struct platform_device *pdev)
 	if (!IS_ERR_OR_NULL(charger->usb_phy))
 		usb_unregister_notifier(charger->usb_phy, &charger->otg_nb);
 
-	power_supply_unregister(&charger->battery);
-	power_supply_unregister(&charger->usb);
+	power_supply_unregister(charger->battery);
+	power_supply_unregister(charger->usb);
 
 	/* Release ADC channels */
 	iio_channel_release(charger->ibus_chan);