4.9-stable review patch.  If anyone has any objections, please let me know.


From: Karol Herbst <kher...@redhat.com>

[ Upstream commit a121027d2747168df0aac0c3da35509eea39f61c ]

On my GP107 when I load nouveau after unloading it, for some reason the
GPU stopped sending or the CPU stopped receiving interrupts if MSI was

Doing a rearm once before getting any interrupts fixes this.

Signed-off-by: Karol Herbst <kher...@redhat.com>
Reviewed-by: Thierry Reding <tred...@nvidia.com>
Signed-off-by: Ben Skeggs <bske...@redhat.com>
Signed-off-by: Sasha Levin <alexander.le...@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
 drivers/gpu/drm/nouveau/nvkm/subdev/pci/base.c |    7 +++++++
 1 file changed, 7 insertions(+)

--- a/drivers/gpu/drm/nouveau/nvkm/subdev/pci/base.c
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/pci/base.c
@@ -136,6 +136,13 @@ nvkm_pci_init(struct nvkm_subdev *subdev
                return ret;
        pci->irq = pdev->irq;
+       /* Ensure MSI interrupts are armed, for the case where there are
+        * already interrupts pending (for whatever reason) at load time.
+        */
+       if (pci->msi)
+               pci->func->msi_rearm(pci);
        return ret;

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