commit bcf7b3914e9cd04e09685a1460da8b90e46a8001
Author: Chuck Ebbert <[EMAIL PROTECTED]>
Date: Wed Apr 16 02:45:05 2008 +0000
acpi: bus: check once more for an empty list after locking it
upstream commit: f0a37e008750ead1751b7d5e89d220a260a46147
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]>
Signed-off-by: Chris Wright <[EMAIL PROTECTED]>
diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c
index f4487c3..3401e2c 100644
--- a/drivers/acpi/bus.c
+++ b/drivers/acpi/bus.c
@@ -350,10 +350,11 @@ 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)
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