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ACPI/AC: prevent OOPS on some boxes due to missing check power_supply_register() return value check 

In the ac.c, power_supply_register()'s return value is not checked.

As a result, the driver's add() ops may return success
even though the device failed to initialize.

For example, some BIOS may describe two ACADs in the same DSDT.
The second ACAD device will fail to register,
but ACPI driver's add() ops returns sucessfully.
The ACPI device will receive ACPI notification and cause OOPS.

https://bugzilla.redhat.com/show_bug.cgi?id=772730

Signed-off-by: Lan Tianyu <tianyu.lan@intel.com>
Cc: stable@vger.kernel.org
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Lan Tianyu 2012-07-20 13:29:16 +08:00 committed by Len Brown
parent 28a33cbc24
commit f197ac13f6
1 changed files with 3 additions and 1 deletions
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4
drivers/acpi/ac.c
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@ -292,7 +292,9 @@ static int acpi_ac_add(struct acpi_device *device)
ac->charger.properties = ac_props;
ac->charger.num_properties = ARRAY_SIZE(ac_props);
ac->charger.get_property = get_ac_property;
power_supply_register(&ac->device->dev, &ac->charger);
result = power_supply_register(&ac->device->dev, &ac->charger);
if (result)
goto end;
printk(KERN_INFO PREFIX "%s [%s] (%s)\n",
acpi_device_name(device), acpi_device_bid(device),