The patch titled
acpi: bus: check once more for an empty list after locking it
has been added to the -mm tree. Its filename is
acpi-bus-check-once-more-for-an-empty-list-after-locking-it.patch
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------------------------------------------------------
Subject: acpi: bus: check once more for an empty list after locking it
From: Chuck Ebbert <cebbert@xxxxxxxxxx>
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@xxxxxxxxxx>
Cc: <stable@xxxxxxxxxx>
Cc: Len Brown <lenb@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/acpi/bus.c | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)
diff -puN drivers/acpi/bus.c~acpi-bus-check-once-more-for-an-empty-list-after-locking-it drivers/acpi/bus.c
--- a/drivers/acpi/bus.c~acpi-bus-check-once-more-for-an-empty-list-after-locking-it
+++ a/drivers/acpi/bus.c
@@ -373,10 +373,11 @@ int acpi_bus_receive_event(struct acpi_b
}
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)
_
Patches currently in -mm which might be from cebbert@xxxxxxxxxx are
acpi-bus-check-once-more-for-an-empty-list-after-locking-it.patch
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