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acpi: bus: check once more for an empty list after locking it

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List could have become empty after the unlocked check that was made earlier,
so check again inside the lock.

Should fix https://bugzilla.redhat.com/show_bug.cgi?id=427765

Signed-off-by: Chuck Ebbert <[email protected]>
Cc: <[email protected]>
Cc: Len Brown <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Chuck Ebbert 2008-04-15 14:34:47 -07:00 • committed by Linus Torvalds
commit f0a37e0087
1 changed files with 4 additions and 3 deletions
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7
drivers/acpi/bus.c
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@ -373,10 +373,11 @@ int acpi_bus_receive_event(struct acpi_bus_event *event)
}
spin_lock_irqsave(&acpi_bus_event_lock, flags);
entry =
list_entry(acpi_bus_event_list.next, struct acpi_bus_event, node);
if (entry)
if (!list_empty(&acpi_bus_event_list)) {
entry = list_entry(acpi_bus_event_list.next,
struct acpi_bus_event, node);
list_del(&entry->node);
}
spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
if (!entry)