[Nouveau] [PATCH 1/9] drm/nouveau/kms: Handle -EINPROGRESS in nouveau_connector_hotplug()

[Lyude Paul]

Looks like that we forgot to handle -EINPROGRESS being returned by
pm_runtime_get(), which can happen if multiple callers try to
asynchronously resume the GPU before it wakes up. This is perfectly
normal and OK, so fix this by treating -EINPROGRESS as success.

Signed-off-by: Lyude Paul <lyude at redhat.com>
Fixes: 3e1a12754d4d ("drm/nouveau: Fix deadlocks in nouveau_connector_detect()")
Cc: stable at vger.kernel.org
Cc: Ben Skeggs <bskeggs at redhat.com>
Cc: dri-devel at lists.freedesktop.org
Cc: nouveau at lists.freedesktop.org
Cc: <stable at vger.kernel.org> # v4.19+
---
 drivers/gpu/drm/nouveau/nouveau_connector.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/nouveau/nouveau_connector.c b/drivers/gpu/drm/nouveau/nouveau_connector.c
index 7674025a4bfe8..38e226b8cfd05 100644
--- a/drivers/gpu/drm/nouveau/nouveau_connector.c
+++ b/drivers/gpu/drm/nouveau/nouveau_connector.c
@@ -1173,7 +1173,7 @@ nouveau_connector_hotplug(struct nvif_notify *notify)
 	}
 
 	ret = pm_runtime_get(drm->dev->dev);
-	if (ret == 0) {
+	if (ret == 0 || ret == -EINPROGRESS) {
 		/* We can't block here if there's a pending PM request
 		 * running, as we'll deadlock nouveau_display_fini() when it
 		 * calls nvif_put() on our nvif_notify struct. So, simply
-- 
2.26.2