drm/v3d: Fix race-condition between DRM scheduler and IRQs

Link: #6624
Fixes: e4b5ccd ("drm/v3d: Ensure job pointer is set to NULL after job completion")
Signed-off-by: Maíra Canal <[email protected]>
Co-authored-by: Maíra Canal <[email protected]>

Author: 2 people

Diff for: drivers/gpu/drm/v3d/v3d_irq.c

@@ -105,8 +105,10 @@ v3d_irq(int irq, void *arg)
 		v3d->gpu_queue_stats[V3D_BIN].last_exec_end = local_clock();
 
 		trace_v3d_bcl_irq(&v3d->drm, fence->seqno);
-		dma_fence_signal(&fence->base);
+
 		v3d->bin_job = NULL;
+		dma_fence_signal(&fence->base);
+
 		status = IRQ_HANDLED;
 	}
 
@@ -116,8 +118,10 @@ v3d_irq(int irq, void *arg)
 		v3d->gpu_queue_stats[V3D_RENDER].last_exec_end = local_clock();
 
 		trace_v3d_rcl_irq(&v3d->drm, fence->seqno);
-		dma_fence_signal(&fence->base);
+
 		v3d->render_job = NULL;
+		dma_fence_signal(&fence->base);
+
 		status = IRQ_HANDLED;
 	}
 
@@ -128,8 +132,10 @@ v3d_irq(int irq, void *arg)
 		v3d->gpu_queue_stats[V3D_CSD].last_exec_end = local_clock();
 
 		trace_v3d_csd_irq(&v3d->drm, fence->seqno);
-		dma_fence_signal(&fence->base);
+
 		v3d->csd_job = NULL;
+		dma_fence_signal(&fence->base);
+
 		status = IRQ_HANDLED;
 	}
 
@@ -166,8 +172,10 @@ v3d_hub_irq(int irq, void *arg)
 		v3d->gpu_queue_stats[V3D_TFU].last_exec_end = local_clock();
 
 		trace_v3d_tfu_irq(&v3d->drm, fence->seqno);
-		dma_fence_signal(&fence->base);
+
 		v3d->tfu_job = NULL;
+		dma_fence_signal(&fence->base);
+
 		status = IRQ_HANDLED;
 	}