From f0a37e008750ead1751b7d5e89d220a260a46147 Mon Sep 17 00:00:00 2001 From: Chuck Ebbert Date: Tue, 15 Apr 2008 14:34:47 -0700 Subject: [PATCH] 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 Cc: Cc: Len Brown Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/acpi/bus.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c index 5b6760e0f957..2d1955c11833 100644 --- a/drivers/acpi/bus.c +++ b/drivers/acpi/bus.c @@ -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) -- 2.20.1