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Subject[PATCH 3/12] ACPI sbs: fix retval warning
Date
drivers/acpi/sbs.c: In function ‘acpi_battery_add’:
drivers/acpi/sbs.c:811: warning: ignoring return value of ‘device_create_file’, declared with attribute warn_unused_result

Additional cleanups:
* use struct acpi_battery in acpi_battery_remove() to clean up function
calls, just like acpi_battery_add() already does.

* un-indent unregister call, as it mistakenly gives the impression that
it belongs inside the 'if' test

* remove unneeded braces

Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
---
diff --git a/drivers/acpi/sbs.c b/drivers/acpi/sbs.c
index 90fd09c..c5c011b 100644
--- a/drivers/acpi/sbs.c
+++ b/drivers/acpi/sbs.c
@@ -113,6 +113,7 @@ struct acpi_battery {
u16 spec;
u8 id;
u8 present:1;
+ u8 have_sysfs:1;
};

#define to_acpi_battery(x) container_of(x, struct acpi_battery, bat);
@@ -808,7 +809,8 @@ static int acpi_battery_add(struct acpi_sbs *sbs, int id)
}
battery->bat.get_property = acpi_sbs_battery_get_property;
result = power_supply_register(&sbs->device->dev, &battery->bat);
- device_create_file(battery->bat.dev, &alarm_attr);
+ if (device_create_file(battery->bat.dev, &alarm_attr) == 0)
+ battery->have_sysfs = 1;
printk(KERN_INFO PREFIX "%s [%s]: Battery Slot [%s] (battery %s)\n",
ACPI_SBS_DEVICE_NAME, acpi_device_bid(sbs->device),
battery->name, sbs->battery->present ? "present" : "absent");
@@ -817,14 +819,16 @@ static int acpi_battery_add(struct acpi_sbs *sbs, int id)

static void acpi_battery_remove(struct acpi_sbs *sbs, int id)
{
- if (sbs->battery[id].bat.dev)
- device_remove_file(sbs->battery[id].bat.dev, &alarm_attr);
- power_supply_unregister(&sbs->battery[id].bat);
+ struct acpi_battery *battery = &sbs->battery[id];
+
+ if (battery->have_sysfs)
+ device_remove_file(battery->bat.dev, &alarm_attr);
+
+ power_supply_unregister(&battery->bat);
+
#ifdef CONFIG_ACPI_PROCFS
- if (sbs->battery[id].proc_entry) {
- acpi_sbs_remove_fs(&(sbs->battery[id].proc_entry),
- acpi_battery_dir);
- }
+ if (sbs->battery[id].proc_entry)
+ acpi_sbs_remove_fs(&battery->proc_entry, acpi_battery_dir);
#endif
}

-
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