7f1a57fdd6
Don't call the power_supply_changed() from power_supply_register() when
parent is still probing because it may lead to accessing parent too
early.
In bq27x00_battery this caused NULL pointer exception because uevent of
power_supply_changed called back the the get_property() method provided
by the driver. The get_property() method accessed pointer which should
be returned by power_supply_register().
Starting from bq27x00_battery_probe():
di->bat = power_supply_register()
power_supply_changed()
kobject_uevent()
power_supply_uevent()
power_supply_show_property()
power_supply_get_property()
bq27x00_battery_get_property()
dereference of di->bat which is NULL here
The dereference of di->bat (value returned by power_supply_register())
is the currently visible problem. However calling back the methods
provided by driver before ending the probe may lead to accessing other
driver-related data which is not yet initialized.
The call to power_supply_changed() is postponed till probing ends -
mutex of parent device is released.
Reported-by: H. Nikolaus Schaller <hns@goldelico.com>
Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Fixes:
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| .. | ||
| acpi | ||
| asm-generic | ||
| clocksource | ||
| crypto | ||
| drm | ||
| dt-bindings | ||
| keys | ||
| kvm | ||
| linux | ||
| math-emu | ||
| media | ||
| memory | ||
| misc | ||
| net | ||
| pcmcia | ||
| ras | ||
| rdma | ||
| rxrpc | ||
| scsi | ||
| soc | ||
| sound | ||
| target | ||
| trace | ||
| uapi | ||
| video | ||
| xen | ||
| Kbuild | ||