linux-kernel - [PATCH 1/9] drm/nouveau/kms: Handle -EINPROGRESS in nouveau_connector

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Date:   Wed, 29 Jul 2020 17:36:55 -0400
From:   Lyude Paul <lyude@...hat.com>
To:     nouveau@...ts.freedesktop.org
Cc:     stable@...r.kernel.org, Ben Skeggs <bskeggs@...hat.com>,
        dri-devel@...ts.freedesktop.org, David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Karol Herbst <kherbst@...hat.com>,
        linux-kernel@...r.kernel.org (open list)
Subject: [PATCH 1/9] drm/nouveau/kms: Handle -EINPROGRESS in nouveau_connector_hotplug()

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@...hat.com>
Fixes: 3e1a12754d4d ("drm/nouveau: Fix deadlocks in nouveau_connector_detect()")
Cc: stable@...r.kernel.org
Cc: Ben Skeggs <bskeggs@...hat.com>
Cc: dri-devel@...ts.freedesktop.org
Cc: nouveau@...ts.freedesktop.org
Cc: <stable@...r.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