1 files changed, 52 insertions, 25 deletions

diff --git a/drivers/acpi/acpica/evxface.c b/drivers/acpi/acpica/evxface.c
index 4a531cdf7942..14e48add32fa 100644
--- a/drivers/acpi/acpica/evxface.c
+++ b/drivers/acpi/acpica/evxface.c
@@ -691,12 +691,22 @@ acpi_install_gpe_handler(acpi_handle gpe_device,
                 return_ACPI_STATUS(status);
         }
 
+        /* Allocate memory for the handler object */
+
+        handler = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_handler_info));
+        if (!handler) {
+                status = AE_NO_MEMORY;
+                goto unlock_and_exit;
+        }
+
+        flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
+
         /* Ensure that we have a valid GPE number */
 
         gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
         if (!gpe_event_info) {
                 status = AE_BAD_PARAMETER;
-                goto unlock_and_exit;
+                goto free_and_exit;
         }
 
         /* Make sure that there isn't a handler there already */
@@ -704,24 +714,30 @@ acpi_install_gpe_handler(acpi_handle gpe_device,
         if ((gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) ==
             ACPI_GPE_DISPATCH_HANDLER) {
                 status = AE_ALREADY_EXISTS;
-                goto unlock_and_exit;
+                goto free_and_exit;
         }
 
         /* Allocate and init handler object */
 
-        handler = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_handler_info));
-        if (!handler) {
-                status = AE_NO_MEMORY;
-                goto unlock_and_exit;
-        }
-
         handler->address = address;
         handler->context = context;
         handler->method_node = gpe_event_info->dispatch.method_node;
+        handler->orig_flags = gpe_event_info->flags &
+                        (ACPI_GPE_XRUPT_TYPE_MASK | ACPI_GPE_DISPATCH_MASK);
+
+        /*
+         * If the GPE is associated with a method and it cannot wake up the
+         * system from sleep states, it was enabled automatically during
+         * initialization, so it has to be disabled now to avoid spurious
+         * execution of the handler.
+         */
+
+        if ((handler->orig_flags & ACPI_GPE_DISPATCH_METHOD)
+            && !(gpe_event_info->flags & ACPI_GPE_CAN_WAKE))
+                (void)acpi_raw_disable_gpe(gpe_event_info);
 
         /* Install the handler */
 
-        flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
         gpe_event_info->dispatch.handler = handler;
 
         /* Setup up dispatch flags to indicate handler (vs. method) */
@@ -735,6 +751,11 @@ acpi_install_gpe_handler(acpi_handle gpe_device,
 unlock_and_exit:
         (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
         return_ACPI_STATUS(status);
+
+free_and_exit:
+        acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
+        ACPI_FREE(handler);
+        goto unlock_and_exit;
 }
 
 ACPI_EXPORT_SYMBOL(acpi_install_gpe_handler)
@@ -770,11 +791,17 @@ acpi_remove_gpe_handler(acpi_handle gpe_device,
                 return_ACPI_STATUS(AE_BAD_PARAMETER);
         }
 
+        /* Make sure all deferred tasks are completed */
+
+        acpi_os_wait_events_complete(NULL);
+
         status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
         if (ACPI_FAILURE(status)) {
                 return_ACPI_STATUS(status);
         }
 
+        flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
+
         /* Ensure that we have a valid GPE number */
 
         gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
@@ -798,34 +825,34 @@ acpi_remove_gpe_handler(acpi_handle gpe_device,
                 goto unlock_and_exit;
         }
 
-        /* Make sure all deferred tasks are completed */
-
-        (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
-        acpi_os_wait_events_complete(NULL);
-        status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
-        if (ACPI_FAILURE(status)) {
-                return_ACPI_STATUS(status);
-        }
-
         /* Remove the handler */
 
-        flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
         handler = gpe_event_info->dispatch.handler;
 
         /* Restore Method node (if any), set dispatch flags */
 
         gpe_event_info->dispatch.method_node = handler->method_node;
-        gpe_event_info->flags &= ~ACPI_GPE_DISPATCH_MASK;       /* Clear bits */
-        if (handler->method_node) {
-                gpe_event_info->flags |= ACPI_GPE_DISPATCH_METHOD;
-        }
-        acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
+        gpe_event_info->flags &=
+                ~(ACPI_GPE_XRUPT_TYPE_MASK | ACPI_GPE_DISPATCH_MASK);
+        gpe_event_info->flags |= handler->orig_flags;
+
+        /*
+         * If the GPE was previously associated with a method and it cannot wake
+         * up the system from sleep states, it should be enabled at this point
+         * to restore the post-initialization configuration.
+         */
+
+        if ((handler->orig_flags & ACPI_GPE_DISPATCH_METHOD)
+            && !(gpe_event_info->flags & ACPI_GPE_CAN_WAKE))
+                (void)acpi_raw_enable_gpe(gpe_event_info);
 
         /* Now we can free the handler object */
 
         ACPI_FREE(handler);
 
-      unlock_and_exit:
+unlock_and_exit:
+        acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
+
         (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
         return_ACPI_STATUS(status);
 }