linux-kernel - [PATCH 2/2] drm/nouveau: Don't pm_runtime_put_sync(), only pm_runtime_put

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Message-Id: <20220526204732.660069-3-lyude@redhat.com>
Date:   Thu, 26 May 2022 16:47:32 -0400
From:   Lyude Paul <lyude@...hat.com>
To:     nouveau@...ts.freedesktop.org
Cc:     Karol Herbst <kherbst@...hat.com>, Ben Skeggs <bskeggs@...hat.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        dri-devel@...ts.freedesktop.org (open list:DRM DRIVER FOR NVIDIA
        GEFORCE/QUADRO GPUS), linux-kernel@...r.kernel.org (open list)
Subject: [PATCH 2/2] drm/nouveau: Don't pm_runtime_put_sync(), only pm_runtime_put_autosuspend()

While trying to fix another issue, it occurred to me that I don't actually
think there is any situation where we want pm_runtime_put() in nouveau to
be synchronous. In fact, this kind of just seems like it would cause
issues where we may unexpectedly block a thread we don't expect to be
blocked.

So, let's only use pm_runtime_put_autosuspend().

Signed-off-by: Lyude Paul <lyude@...hat.com>
---
 drivers/gpu/drm/nouveau/nouveau_display.c | 2 +-
 drivers/gpu/drm/nouveau/nouveau_fbcon.c   | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/nouveau/nouveau_display.c b/drivers/gpu/drm/nouveau/nouveau_display.c
index 9f5a45f24e5b..103bfb11acb9 100644
--- a/drivers/gpu/drm/nouveau/nouveau_display.c
+++ b/drivers/gpu/drm/nouveau/nouveau_display.c
@@ -515,7 +515,7 @@ nouveau_display_hpd_work(struct work_struct *work)
 
 	pm_runtime_mark_last_busy(drm->dev->dev);
 noop:
-	pm_runtime_put_sync(drm->dev->dev);
+	pm_runtime_put(drm->dev->dev);
 }
 
 #ifdef CONFIG_ACPI
diff --git a/drivers/gpu/drm/nouveau/nouveau_fbcon.c b/drivers/gpu/drm/nouveau/nouveau_fbcon.c
index 4f9b3aa5deda..20ac1ce2c0f1 100644
--- a/drivers/gpu/drm/nouveau/nouveau_fbcon.c
+++ b/drivers/gpu/drm/nouveau/nouveau_fbcon.c
@@ -466,7 +466,7 @@ nouveau_fbcon_set_suspend_work(struct work_struct *work)
 	if (state == FBINFO_STATE_RUNNING) {
 		nouveau_fbcon_hotplug_resume(drm->fbcon);
 		pm_runtime_mark_last_busy(drm->dev->dev);
-		pm_runtime_put_sync(drm->dev->dev);
+		pm_runtime_put_autosuspend(drm->dev->dev);
 	}
 }
 
-- 
2.35.3