video_core: stop resuming pending channels once the system is powered off

At shutdown is_powered_on is cleared before the GPU thread is stopped.
A channel suspended on a semaphore acquire that can resume then went
through DispatchCalls, which returns at once when powered off, so the
acquire stayed pending and ResumePending counted it as progress forever:
the GPU thread never got back to its stop request and closing the game
hung in ThreadManager::NotifyShutdown.

1 files changed, 7 insertions, 0 deletions

diff --git a/src/video_core/control/scheduler.cpp b/src/video_core/control/scheduler.cpp
index c120533c37..dc42906752 100644
--- a/src/video_core/control/scheduler.cpp
+++ b/src/video_core/control/scheduler.cpp
@@ -9,6 +9,7 @@
 #include <vector>
 
 #include "common/assert.h"
+#include "core/core.h"
 #include "video_core/control/channel_state.h"
 #include "video_core/control/scheduler.h"
 #include "video_core/gpu.h"
@@ -59,6 +60,12 @@ void Scheduler::ResumePending(GPU& gpu) {
         progress = false;
         for (const auto& state : pending_channels) {
             auto& dma_pusher = state->payload->dma_pusher;
+            // Powered off (shutting down), DispatchCalls returns at once and the acquire stays
+            // pending: resuming it again counted as progress forever and the GPU thread never
+            // reached its stop request (closing the game hung).
+            if (!dma_pusher.system.IsPoweredOn()) {
+                return;
+            }
             if (!dma_pusher.HasPendingAcquire() || !dma_pusher.CanResumeAcquire()) {
                 continue;
             }