ACPICA: Fixed possible corruption of global GPE list

Fixed a problem in acpi_ev_delete_gpe_xrupt where the global interrupt
list could be corrupted if the interrupt being removed was at
the head of the list. Reported by Linn Crosetto.

Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/acpi/events/evgpeblk.c b/drivers/acpi/events/evgpeblk.c
index 902c287b3a4f..361ebe6c4a6f 100644
--- a/drivers/acpi/events/evgpeblk.c
+++ b/drivers/acpi/events/evgpeblk.c
@@ -586,6 +586,10 @@ acpi_ev_delete_gpe_xrupt(struct acpi_gpe_xrupt_info *gpe_xrupt)
         flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
         if (gpe_xrupt->previous) {
                 gpe_xrupt->previous->next = gpe_xrupt->next;
+        } else {
+                /* No previous, update list head */
+
+                acpi_gbl_gpe_xrupt_list_head = gpe_xrupt->next;
         }
 
         if (gpe_xrupt->next) {