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/lib/efi_loader/efi_console.c b/lib/efi_loader/efi_console.c
index 3fc82b8..65c07fd 100644
--- a/lib/efi_loader/efi_console.c
+++ b/lib/efi_loader/efi_console.c
@@ -426,8 +426,10 @@ static void EFIAPI efi_console_timer_notify(struct efi_event *event,
 					    void *context)
 {
 	EFI_ENTRY("%p, %p", event, context);
-	if (tstc())
+	if (tstc()) {
+		efi_con_in.wait_for_key->signaled = 1;
 		efi_signal_event(efi_con_in.wait_for_key);
+		}
 	EFI_EXIT(EFI_SUCCESS);
 }