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

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 <cebbert@redhat.com>
Cc: <stable@kernel.org>
Cc: Len Brown <lenb@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Chuck Ebbert 2008-04-15 14:34:47 -07:00 committed by Linus Torvalds
parent d1e7780638
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)