Revert 190c462d5be19ba622a82f5fd0625087c870a1e6..bf3012ada1b2222e770de5c35c1bb16f73b3a01d"

I shouldn't have pushed this, CI was right - I failed to remove the
BUG_ON(!ops->wait);

Reported-by: Chris Wilson <chris@chris-wilson.co.uk>
Acked-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>

7 files changed, 35 insertions, 16 deletions

diff --git a/drivers/dma-buf/dma-fence-array.c b/drivers/dma-buf/dma-fence-array.c
index a8c254497251..dd1edfb27b61 100644
--- a/drivers/dma-buf/dma-fence-array.c
+++ b/drivers/dma-buf/dma-fence-array.c
@@ -104,6 +104,7 @@ const struct dma_fence_ops dma_fence_array_ops = {
 	.get_timeline_name = dma_fence_array_get_timeline_name,
 	.enable_signaling = dma_fence_array_enable_signaling,
 	.signaled = dma_fence_array_signaled,
+	.wait = dma_fence_default_wait,
 	.release = dma_fence_array_release,
 };
 EXPORT_SYMBOL(dma_fence_array_ops);
diff --git a/drivers/dma-buf/dma-fence.c b/drivers/dma-buf/dma-fence.c
index 30fcbe415ff4..4edb9fd3cf47 100644
--- a/drivers/dma-buf/dma-fence.c
+++ b/drivers/dma-buf/dma-fence.c
@@ -158,10 +158,7 @@ dma_fence_wait_timeout(struct dma_fence *fence, bool intr, signed long timeout)
 		return -EINVAL;
 
 	trace_dma_fence_wait_start(fence);
-	if (fence->ops->wait)
-		ret = fence->ops->wait(fence, intr, timeout);
-	else
-		ret = dma_fence_default_wait(fence, intr, timeout);
+	ret = fence->ops->wait(fence, intr, timeout);
 	trace_dma_fence_wait_end(fence);
 	return ret;
 }
@@ -184,13 +181,6 @@ void dma_fence_release(struct kref *kref)
 }
 EXPORT_SYMBOL(dma_fence_release);
 
-/**
- * dma_fence_free - default release function for &dma_fence.
- * @fence: fence to release
- *
- * This is the default implementation for &dma_fence_ops.release. It calls
- * kfree_rcu() on @fence.
- */
 void dma_fence_free(struct dma_fence *fence)
 {
 	kfree_rcu(fence, rcu);
@@ -506,6 +496,11 @@ dma_fence_wait_any_timeout(struct dma_fence **fences, uint32_t count,
 	for (i = 0; i < count; ++i) {
 		struct dma_fence *fence = fences[i];
 
+		if (fence->ops->wait != dma_fence_default_wait) {
+			ret = -EINVAL;
+			goto fence_rm_cb;
+		}
+
 		cb[i].task = current;
 		if (dma_fence_add_callback(fence, &cb[i].base,
 					   dma_fence_default_wait_cb)) {
@@ -565,7 +560,7 @@ dma_fence_init(struct dma_fence *fence, const struct dma_fence_ops *ops,
 	       spinlock_t *lock, u64 context, unsigned seqno)
 {
 	BUG_ON(!lock);
-	BUG_ON(!ops || !ops->wait ||
+	BUG_ON(!ops || !ops->wait || !ops->enable_signaling ||
 	       !ops->get_driver_name || !ops->get_timeline_name);
 
 	kref_init(&fence->refcount);
@@ -577,10 +572,6 @@ dma_fence_init(struct dma_fence *fence, const struct dma_fence_ops *ops,
 	fence->flags = 0UL;
 	fence->error = 0;
 
-	if (!ops->enable_signaling)
-		set_bit(DMA_FENCE_FLAG_ENABLE_SIGNAL_BIT,
-			&fence->flags);
-
 	trace_dma_fence_init(fence);
 }
 EXPORT_SYMBOL(dma_fence_init);
diff --git a/drivers/dma-buf/sw_sync.c b/drivers/dma-buf/sw_sync.c
index 53c1d6d36a64..3d78ca89a605 100644
--- a/drivers/dma-buf/sw_sync.c
+++ b/drivers/dma-buf/sw_sync.c
@@ -188,6 +188,7 @@ static const struct dma_fence_ops timeline_fence_ops = {
 	.get_timeline_name = timeline_fence_get_timeline_name,
 	.enable_signaling = timeline_fence_enable_signaling,
 	.signaled = timeline_fence_signaled,
+	.wait = dma_fence_default_wait,
 	.release = timeline_fence_release,
 	.fence_value_str = timeline_fence_value_str,
 	.timeline_value_str = timeline_fence_timeline_value_str,
diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
index e4d3285f4191..a231dd5dce16 100644
--- a/drivers/gpu/drm/drm_crtc.c
+++ b/drivers/gpu/drm/drm_crtc.c
@@ -225,9 +225,16 @@ static const char *drm_crtc_fence_get_timeline_name(struct dma_fence *fence)
 	return crtc->timeline_name;
 }
 
+static bool drm_crtc_fence_enable_signaling(struct dma_fence *fence)
+{
+	return true;
+}
+
 static const struct dma_fence_ops drm_crtc_fence_ops = {
 	.get_driver_name = drm_crtc_fence_get_driver_name,
 	.get_timeline_name = drm_crtc_fence_get_timeline_name,
+	.enable_signaling = drm_crtc_fence_enable_signaling,
+	.wait = dma_fence_default_wait,
 };
 
 struct dma_fence *drm_crtc_create_fence(struct drm_crtc *crtc)
diff --git a/drivers/gpu/drm/drm_syncobj.c b/drivers/gpu/drm/drm_syncobj.c
index adb3cb27d31e..d4f4ce484529 100644
--- a/drivers/gpu/drm/drm_syncobj.c
+++ b/drivers/gpu/drm/drm_syncobj.c
@@ -207,6 +207,7 @@ static const struct dma_fence_ops drm_syncobj_null_fence_ops = {
 	.get_driver_name = drm_syncobj_null_fence_get_name,
 	.get_timeline_name = drm_syncobj_null_fence_get_name,
 	.enable_signaling = drm_syncobj_null_fence_enable_signaling,
+	.wait = dma_fence_default_wait,
 	.release = NULL,
 };
 
diff --git a/drivers/gpu/drm/qxl/qxl_release.c b/drivers/gpu/drm/qxl/qxl_release.c
index 04f3605ac42a..5d84a66fed36 100644
--- a/drivers/gpu/drm/qxl/qxl_release.c
+++ b/drivers/gpu/drm/qxl/qxl_release.c
@@ -50,6 +50,12 @@ static const char *qxl_get_timeline_name(struct dma_fence *fence)
 	return "release";
 }
 
+static bool qxl_nop_signaling(struct dma_fence *fence)
+{
+	/* fences are always automatically signaled, so just pretend we did this.. */
+	return true;
+}
+
 static long qxl_fence_wait(struct dma_fence *fence, bool intr,
 			   signed long timeout)
 {
@@ -113,6 +119,7 @@ signaled:
 static const struct dma_fence_ops qxl_fence_ops = {
 	.get_driver_name = qxl_get_driver_name,
 	.get_timeline_name = qxl_get_timeline_name,
+	.enable_signaling = qxl_nop_signaling,
 	.wait = qxl_fence_wait,
 };
 
diff --git a/drivers/gpu/drm/scheduler/sched_fence.c b/drivers/gpu/drm/scheduler/sched_fence.c
index 4843289cc8f0..69aab086b913 100644
--- a/drivers/gpu/drm/scheduler/sched_fence.c
+++ b/drivers/gpu/drm/scheduler/sched_fence.c
@@ -81,6 +81,11 @@ static const char *drm_sched_fence_get_timeline_name(struct dma_fence *f)
 	return (const char *)fence->sched->name;
 }
 
+static bool drm_sched_fence_enable_signaling(struct dma_fence *f)
+{
+	return true;
+}
+
 /**
  * amd_sched_fence_free - free up the fence memory
  *
@@ -129,12 +134,18 @@ static void drm_sched_fence_release_finished(struct dma_fence *f)
 const struct dma_fence_ops drm_sched_fence_ops_scheduled = {
 	.get_driver_name = drm_sched_fence_get_driver_name,
 	.get_timeline_name = drm_sched_fence_get_timeline_name,
+	.enable_signaling = drm_sched_fence_enable_signaling,
+	.signaled = NULL,
+	.wait = dma_fence_default_wait,
 	.release = drm_sched_fence_release_scheduled,
 };
 
 const struct dma_fence_ops drm_sched_fence_ops_finished = {
 	.get_driver_name = drm_sched_fence_get_driver_name,
 	.get_timeline_name = drm_sched_fence_get_timeline_name,
+	.enable_signaling = drm_sched_fence_enable_signaling,
+	.signaled = NULL,
+	.wait = dma_fence_default_wait,
 	.release = drm_sched_fence_release_finished,
 };