efi_loader: implement queueing of the notification function

For the correct implementation of the task priority level (TPL)
calling the notification function must be queued.

Add a status field 'queued' to events.

In function efi_signal_event set status queued if a notification
function exists and reset it after we have called the function.
A later patch will add a check of the TPL here.

In efi_create_event and efi_close_event unset the queued status.

In function efi_wait_for_event and efi_check_event
queue the notification function.

In efi_timer_check call the efi_notify_event
if the status queued is set.
For all timer events set status signaled.

In efi_console_timer_notify set the signaled state of the
WaitForKey event.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Signed-off-by: Alexander Graf <agraf@suse.de>

1 files changed, 3 insertions, 1 deletions

diff --git a/include/efi_loader.h b/include/efi_loader.h
index f74b33d589..25398ba40c 100644
--- a/include/efi_loader.h
+++ b/include/efi_loader.h
@@ -131,7 +131,8 @@ struct efi_object {
  * @nofify_function:	Function to call when the event is triggered
  * @notify_context:	Data to be passed to the notify function
  * @trigger_type:	Type of timer, see efi_set_timer
- * @signaled:		The notify function was already called
+ * @queued:		The notification functionis queued
+ * @signaled:		The event occured
  */
 struct efi_event {
 	uint32_t type;
@@ -141,6 +142,7 @@ struct efi_event {
 	u64 trigger_next;
 	u64 trigger_time;
 	enum efi_timer_delay trigger_type;
+	int queued;
 	int signaled;
 };