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>
diff --git a/drivers/power/ab8500_fg.c b/drivers/power/ab8500_fg.c
index 7a2e3ac..3830dad 100644
--- a/drivers/power/ab8500_fg.c
+++ b/drivers/power/ab8500_fg.c
@@ -57,9 +57,6 @@
#define interpolate(x, x1, y1, x2, y2) \
((y1) + ((((y2) - (y1)) * ((x) - (x1))) / ((x2) - (x1))));
-#define to_ab8500_fg_device_info(x) container_of((x), \
- struct ab8500_fg, fg_psy);
-
/**
* struct ab8500_fg_interrupts - ab8500 fg interupts
* @name: name of the interrupt
@@ -229,7 +226,7 @@
struct ab8500 *parent;
struct ab8500_gpadc *gpadc;
struct abx500_bm_data *bm;
- struct power_supply fg_psy;
+ struct power_supply *fg_psy;
struct workqueue_struct *fg_wq;
struct delayed_work fg_periodic_work;
struct delayed_work fg_low_bat_work;
@@ -1391,7 +1388,7 @@
di->bat_cap.prev_percent,
di->bat_cap.cap_scale.scaled_cap);
}
- power_supply_changed(&di->fg_psy);
+ power_supply_changed(di->fg_psy);
if (di->flags.fully_charged && di->flags.force_full) {
dev_dbg(di->dev, "Battery full, notifying.\n");
di->flags.force_full = false;
@@ -1850,7 +1847,7 @@
if (!di->flags.bat_ovv) {
dev_dbg(di->dev, "Battery OVV\n");
di->flags.bat_ovv = true;
- power_supply_changed(&di->fg_psy);
+ power_supply_changed(di->fg_psy);
}
/* Not yet recovered from ovv, reschedule this test */
queue_delayed_work(di->fg_wq, &di->fg_check_hw_failure_work,
@@ -1858,7 +1855,7 @@
} else {
dev_dbg(di->dev, "Battery recovered from OVV\n");
di->flags.bat_ovv = false;
- power_supply_changed(&di->fg_psy);
+ power_supply_changed(di->fg_psy);
}
}
@@ -2096,9 +2093,7 @@
enum power_supply_property psp,
union power_supply_propval *val)
{
- struct ab8500_fg *di;
-
- di = to_ab8500_fg_device_info(psy);
+ struct ab8500_fg *di = power_supply_get_drvdata(psy);
/*
* If battery is identified as unknown and charging of unknown
@@ -2181,14 +2176,14 @@
psy = (struct power_supply *)data;
ext = dev_get_drvdata(dev);
- di = to_ab8500_fg_device_info(psy);
+ di = power_supply_get_drvdata(psy);
/*
* For all psy where the name of your driver
* appears in any supplied_to
*/
for (i = 0; i < ext->num_supplicants; i++) {
- if (!strcmp(ext->supplied_to[i], psy->name))
+ if (!strcmp(ext->supplied_to[i], psy->desc->name))
psy_found = true;
}
@@ -2196,16 +2191,16 @@
return 0;
/* Go through all properties for the psy */
- for (j = 0; j < ext->num_properties; j++) {
+ for (j = 0; j < ext->desc->num_properties; j++) {
enum power_supply_property prop;
- prop = ext->properties[j];
+ prop = ext->desc->properties[j];
if (power_supply_get_property(ext, prop, &ret))
continue;
switch (prop) {
case POWER_SUPPLY_PROP_STATUS:
- switch (ext->type) {
+ switch (ext->desc->type) {
case POWER_SUPPLY_TYPE_BATTERY:
switch (ret.intval) {
case POWER_SUPPLY_STATUS_UNKNOWN:
@@ -2244,7 +2239,7 @@
};
break;
case POWER_SUPPLY_PROP_TECHNOLOGY:
- switch (ext->type) {
+ switch (ext->desc->type) {
case POWER_SUPPLY_TYPE_BATTERY:
if (!di->flags.batt_id_received &&
di->bm->batt_id != BATTERY_UNKNOWN) {
@@ -2274,7 +2269,7 @@
}
break;
case POWER_SUPPLY_PROP_TEMP:
- switch (ext->type) {
+ switch (ext->desc->type) {
case POWER_SUPPLY_TYPE_BATTERY:
if (di->flags.batt_id_received)
di->bat_temp = ret.intval;
@@ -2399,10 +2394,10 @@
*/
static void ab8500_fg_external_power_changed(struct power_supply *psy)
{
- struct ab8500_fg *di = to_ab8500_fg_device_info(psy);
+ struct ab8500_fg *di = power_supply_get_drvdata(psy);
class_for_each_device(power_supply_class, NULL,
- &di->fg_psy, ab8500_fg_get_ext_psy_data);
+ di->fg_psy, ab8500_fg_get_ext_psy_data);
}
/**
@@ -2580,9 +2575,7 @@
int ret;
u8 reg_value;
struct power_supply *psy = dev_get_drvdata(dev);
- struct ab8500_fg *di;
-
- di = to_ab8500_fg_device_info(psy);
+ struct ab8500_fg *di = power_supply_get_drvdata(psy);
ret = abx500_get_register_interruptible(di->dev, AB8500_RTC,
AB8505_RTC_PCUT_FLAG_TIME_REG, ®_value);
@@ -2605,9 +2598,7 @@
int ret;
long unsigned reg_value;
struct power_supply *psy = dev_get_drvdata(dev);
- struct ab8500_fg *di;
-
- di = to_ab8500_fg_device_info(psy);
+ struct ab8500_fg *di = power_supply_get_drvdata(psy);
reg_value = simple_strtoul(buf, NULL, 10);
@@ -2633,9 +2624,7 @@
int ret;
u8 reg_value;
struct power_supply *psy = dev_get_drvdata(dev);
- struct ab8500_fg *di;
-
- di = to_ab8500_fg_device_info(psy);
+ struct ab8500_fg *di = power_supply_get_drvdata(psy);
ret = abx500_get_register_interruptible(di->dev, AB8500_RTC,
AB8505_RTC_PCUT_MAX_TIME_REG, ®_value);
@@ -2659,9 +2648,7 @@
int ret;
int reg_value;
struct power_supply *psy = dev_get_drvdata(dev);
- struct ab8500_fg *di;
-
- di = to_ab8500_fg_device_info(psy);
+ struct ab8500_fg *di = power_supply_get_drvdata(psy);
reg_value = simple_strtoul(buf, NULL, 10);
if (reg_value > 0x7F) {
@@ -2686,9 +2673,7 @@
int ret;
u8 reg_value;
struct power_supply *psy = dev_get_drvdata(dev);
- struct ab8500_fg *di;
-
- di = to_ab8500_fg_device_info(psy);
+ struct ab8500_fg *di = power_supply_get_drvdata(psy);
ret = abx500_get_register_interruptible(di->dev, AB8500_RTC,
AB8505_RTC_PCUT_RESTART_REG, ®_value);
@@ -2711,9 +2696,7 @@
int ret;
int reg_value;
struct power_supply *psy = dev_get_drvdata(dev);
- struct ab8500_fg *di;
-
- di = to_ab8500_fg_device_info(psy);
+ struct ab8500_fg *di = power_supply_get_drvdata(psy);
reg_value = simple_strtoul(buf, NULL, 10);
if (reg_value > 0xF) {
@@ -2739,9 +2722,7 @@
int ret;
u8 reg_value;
struct power_supply *psy = dev_get_drvdata(dev);
- struct ab8500_fg *di;
-
- di = to_ab8500_fg_device_info(psy);
+ struct ab8500_fg *di = power_supply_get_drvdata(psy);
ret = abx500_get_register_interruptible(di->dev, AB8500_RTC,
AB8505_RTC_PCUT_TIME_REG, ®_value);
@@ -2764,9 +2745,7 @@
int ret;
u8 reg_value;
struct power_supply *psy = dev_get_drvdata(dev);
- struct ab8500_fg *di;
-
- di = to_ab8500_fg_device_info(psy);
+ struct ab8500_fg *di = power_supply_get_drvdata(psy);
ret = abx500_get_register_interruptible(di->dev, AB8500_RTC,
AB8505_RTC_PCUT_RESTART_REG, ®_value);
@@ -2789,9 +2768,7 @@
int ret;
u8 reg_value;
struct power_supply *psy = dev_get_drvdata(dev);
- struct ab8500_fg *di;
-
- di = to_ab8500_fg_device_info(psy);
+ struct ab8500_fg *di = power_supply_get_drvdata(psy);
ret = abx500_get_register_interruptible(di->dev, AB8500_RTC,
AB8505_RTC_PCUT_CTL_STATUS_REG, ®_value);
@@ -2812,9 +2789,7 @@
int ret;
int reg_value;
struct power_supply *psy = dev_get_drvdata(dev);
- struct ab8500_fg *di;
-
- di = to_ab8500_fg_device_info(psy);
+ struct ab8500_fg *di = power_supply_get_drvdata(psy);
reg_value = simple_strtoul(buf, NULL, 10);
if (reg_value > 0x1) {
@@ -2840,9 +2815,7 @@
int ret;
u8 reg_value;
struct power_supply *psy = dev_get_drvdata(dev);
- struct ab8500_fg *di;
-
- di = to_ab8500_fg_device_info(psy);
+ struct ab8500_fg *di = power_supply_get_drvdata(psy);
ret = abx500_get_register_interruptible(di->dev, AB8500_RTC,
AB8505_RTC_PCUT_CTL_STATUS_REG, ®_value);
@@ -2865,9 +2838,7 @@
int ret;
u8 reg_value;
struct power_supply *psy = dev_get_drvdata(dev);
- struct ab8500_fg *di;
-
- di = to_ab8500_fg_device_info(psy);
+ struct ab8500_fg *di = power_supply_get_drvdata(psy);
ret = abx500_get_register_interruptible(di->dev, AB8500_RTC,
AB8505_RTC_PCUT_DEBOUNCE_REG, ®_value);
@@ -2890,9 +2861,7 @@
int ret;
int reg_value;
struct power_supply *psy = dev_get_drvdata(dev);
- struct ab8500_fg *di;
-
- di = to_ab8500_fg_device_info(psy);
+ struct ab8500_fg *di = power_supply_get_drvdata(psy);
reg_value = simple_strtoul(buf, NULL, 10);
if (reg_value > 0x7) {
@@ -2917,9 +2886,7 @@
int ret;
u8 reg_value;
struct power_supply *psy = dev_get_drvdata(dev);
- struct ab8500_fg *di;
-
- di = to_ab8500_fg_device_info(psy);
+ struct ab8500_fg *di = power_supply_get_drvdata(psy);
ret = abx500_get_register_interruptible(di->dev, AB8500_RTC,
AB8505_RTC_PCUT_CTL_STATUS_REG, ®_value);
@@ -2962,15 +2929,16 @@
abx500_get_chip_id(di->dev) >= AB8500_CUT2P0)
|| is_ab8540(di->parent)) {
for (i = 0; i < ARRAY_SIZE(ab8505_fg_sysfs_psy_attrs); i++)
- if (device_create_file(di->fg_psy.dev,
+ if (device_create_file(&di->fg_psy->dev,
&ab8505_fg_sysfs_psy_attrs[i]))
goto sysfs_psy_create_attrs_failed_ab8505;
}
return 0;
sysfs_psy_create_attrs_failed_ab8505:
- dev_err(di->fg_psy.dev, "Failed creating sysfs psy attrs for ab8505.\n");
+ dev_err(&di->fg_psy->dev, "Failed creating sysfs psy attrs for ab8505.\n");
while (i--)
- device_remove_file(di->fg_psy.dev, &ab8505_fg_sysfs_psy_attrs[i]);
+ device_remove_file(&di->fg_psy->dev,
+ &ab8505_fg_sysfs_psy_attrs[i]);
return -EIO;
}
@@ -2983,7 +2951,7 @@
abx500_get_chip_id(di->dev) >= AB8500_CUT2P0)
|| is_ab8540(di->parent)) {
for (i = 0; i < ARRAY_SIZE(ab8505_fg_sysfs_psy_attrs); i++)
- (void)device_remove_file(di->fg_psy.dev,
+ (void)device_remove_file(&di->fg_psy->dev,
&ab8505_fg_sysfs_psy_attrs[i]);
}
}
@@ -3050,7 +3018,7 @@
flush_scheduled_work();
ab8500_fg_sysfs_psy_remove_attrs(di);
- power_supply_unregister(&di->fg_psy);
+ power_supply_unregister(di->fg_psy);
return ret;
}
@@ -3071,6 +3039,15 @@
"ab8500_usb",
};
+static const struct power_supply_desc ab8500_fg_desc = {
+ .name = "ab8500_fg",
+ .type = POWER_SUPPLY_TYPE_BATTERY,
+ .properties = ab8500_fg_props,
+ .num_properties = ARRAY_SIZE(ab8500_fg_props),
+ .get_property = ab8500_fg_get_property,
+ .external_power_changed = ab8500_fg_external_power_changed,
+};
+
static int ab8500_fg_probe(struct platform_device *pdev)
{
struct device_node *np = pdev->dev.of_node;
@@ -3107,15 +3084,9 @@
di->parent = dev_get_drvdata(pdev->dev.parent);
di->gpadc = ab8500_gpadc_get("ab8500-gpadc.0");
- di->fg_psy.name = "ab8500_fg";
- di->fg_psy.type = POWER_SUPPLY_TYPE_BATTERY;
- di->fg_psy.properties = ab8500_fg_props;
- di->fg_psy.num_properties = ARRAY_SIZE(ab8500_fg_props);
- di->fg_psy.get_property = ab8500_fg_get_property;
- di->fg_psy.external_power_changed = ab8500_fg_external_power_changed;
-
psy_cfg.supplied_to = supply_interface;
psy_cfg.num_supplicants = ARRAY_SIZE(supply_interface);
+ psy_cfg.drv_data = di;
di->bat_cap.max_mah_design = MILLI_TO_MICRO *
di->bm->bat_type[di->bm->batt_id].charge_full_design;
@@ -3176,9 +3147,10 @@
di->flags.batt_id_received = false;
/* Register FG power supply class */
- ret = power_supply_register(di->dev, &di->fg_psy, &psy_cfg);
- if (ret) {
+ di->fg_psy = power_supply_register(di->dev, &ab8500_fg_desc, &psy_cfg);
+ if (IS_ERR(di->fg_psy)) {
dev_err(di->dev, "failed to register FG psy\n");
+ ret = PTR_ERR(di->fg_psy);
goto free_inst_curr_wq;
}
@@ -3256,7 +3228,7 @@
return ret;
free_irq:
- power_supply_unregister(&di->fg_psy);
+ power_supply_unregister(di->fg_psy);
/* We also have to free all registered irqs */
for (i = 0; i < ARRAY_SIZE(ab8500_fg_irq_th); i++) {