[PATCH] drm/amd: use drm_kms_helper_poll_fini in amdgpu_device_suspend to avoid warning

[Bert Karwatzki]

When drm_kms_helper_poll_disable is used in amdgpu_device_suspend
without drm_kms_helper_poll_init having been called it causes a warning
in __flush_work:
https://gitlab.freedesktop.org/drm/amd/-/issues/2411
To avoid this one can use drm_kms_helper_poll_fini instead:


>From 51cba3ae1e9f557cca8e37eb43b9b9310d0d504d Mon Sep 17 00:00:00 2001
From: Bert Karwatzki <spasswolf at web.de>
Date: Thu, 16 Feb 2023 10:34:11 +0100
Subject: [PATCH] Use drm_kms_helper_poll_fini instead of
 drm_kms_helper_poll_disable in amdgpu_device.c to avoid a warning from
 __flush_work.

Signed-off-by: Bert Karwatzki <spasswolf at web.de>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 2 +-
 drivers/gpu/drm/drm_probe_helper.c         | 7 ++++---
 2 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
index b325f7039e0e..dc9e9868a84b 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
@@ -4145,7 +4145,7 @@ int amdgpu_device_suspend(struct drm_device *dev,
bool fbcon)
 	if (amdgpu_acpi_smart_shift_update(dev, AMDGPU_SS_DEV_D3))
 		DRM_WARN("smart shift update failed\n");
 
-	drm_kms_helper_poll_disable(dev);
+	drm_kms_helper_poll_fini(dev);
 
 	if (fbcon)
 		drm_fb_helper_set_suspend_unlocked(adev_to_drm(adev)-
>fb_helper, true);
diff --git a/drivers/gpu/drm/drm_probe_helper.c
b/drivers/gpu/drm/drm_probe_helper.c
index 8127be134c39..105d00d5ebf3 100644
--- a/drivers/gpu/drm/drm_probe_helper.c
+++ b/drivers/gpu/drm/drm_probe_helper.c
@@ -842,9 +842,10 @@ EXPORT_SYMBOL(drm_kms_helper_is_poll_worker);
  *
  * This function disables the output polling work.
  *
- * Drivers can call this helper from their device suspend
implementation. It is
- * not an error to call this even when output polling isn't enabled or
already
- * disabled. Polling is re-enabled by calling
drm_kms_helper_poll_enable().
+ * Drivers can call this helper from their device suspend
implementation. If it
+ * is not known if drm_kms_helper_poll_init has been called before the
driver
+ * should use drm_kms_helper_poll_fini_instead.
+ * Polling is re-enabled by calling drm_kms_helper_poll_enable().
  *
  * Note that calls to enable and disable polling must be strictly
ordered, which
  * is automatically the case when they're only call from
suspend/resume
-- 
2.39.1



Bert Karwatzki