drm/nouveau: Ack the context switch interrupt before switching contexts.

Leaving the IRQ unack'ed while switching contexts makes the switch
fail randomly on some nv1x.

Signed-off-by: Francisco Jerez <currojerez@riseup.net>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/drivers/gpu/drm/nouveau/nouveau_irq.c b/drivers/gpu/drm/nouveau/nouveau_irq.c
index 53360f15606..0a4a61770df 100644
--- a/drivers/gpu/drm/nouveau/nouveau_irq.c
+++ b/drivers/gpu/drm/nouveau/nouveau_irq.c
@@ -586,11 +586,11 @@ nouveau_pgraph_irq_handler(struct drm_device *dev)
                 }
 
                 if (status & NV_PGRAPH_INTR_CONTEXT_SWITCH) {
-                        nouveau_pgraph_intr_context_switch(dev);
-
                         status &= ~NV_PGRAPH_INTR_CONTEXT_SWITCH;
                         nv_wr32(dev, NV03_PGRAPH_INTR,
                                  NV_PGRAPH_INTR_CONTEXT_SWITCH);
+
+                        nouveau_pgraph_intr_context_switch(dev);
                 }
 
                 if (status) {