linux-kernel - [PATCH 5.19 0090/1157] drm/nouveau: Dont pm_runtime_put_sync(), only pm_runtime_put

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Date:   Mon, 15 Aug 2022 19:50:46 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Lyude Paul <lyude@...hat.com>,
        David Airlie <airlied@...ux.ie>,
        Hans de Goede <hdegoede@...hat.com>
Subject: [PATCH 5.19 0090/1157] drm/nouveau: Dont pm_runtime_put_sync(), only pm_runtime_put_autosuspend()

From: Lyude Paul <lyude@...hat.com>

commit c96cfaf8fc02d4bb70727dfa7ce7841a3cff9be2 upstream.

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().

Changes since v1:
* Use pm_runtime_put_autosuspend(), not pm_runtime_put()

Signed-off-by: Lyude Paul <lyude@...hat.com>
Reviewed-by: David Airlie <airlied@...ux.ie>
Fixes: 3a6536c51d5d ("drm/nouveau: Intercept ACPI_VIDEO_NOTIFY_PROBE")
Cc: Hans de Goede <hdegoede@...hat.com>
Cc: <stable@...r.kernel.org> # v4.10+
Link: https://patchwork.freedesktop.org/patch/msgid/20220714174234.949259-3-lyude@redhat.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/gpu/drm/nouveau/nouveau_display.c |    2 +-
 drivers/gpu/drm/nouveau/nouveau_fbcon.c   |    2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

--- 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_str
 
 	pm_runtime_mark_last_busy(drm->dev->dev);
 noop:
-	pm_runtime_put_sync(drm->dev->dev);
+	pm_runtime_put_autosuspend(dev->dev);
 }
 
 #ifdef CONFIG_ACPI
--- 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 wo
 	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);
 	}
 }