linux-kernel - [PATCH v4, 2/2] drm: Check polling initialized before enabling in drm_helper_probe_single_connector

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Date: Thu,  1 Feb 2024 22:43:44 -0800
From: Shradha Gupta <shradhagupta@...ux.microsoft.com>
To: linux-kernel@...r.kernel.org,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Maxime Ripard <mripard@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.dev>,
	David Airlie <airlied@...il.com>,
	Daniel Vetter <daniel@...ll.ch>,
	dri-devel@...ts.freedesktop.org,
	Saurabh Singh Sengar <ssengar@...ux.microsoft.com>
Cc: Shradha Gupta <shradhagupta@...ux.microsoft.com>,
	Shradha Gupta <shradhagupta@...rosoft.com>
Subject: [PATCH v4, 2/2] drm: Check polling initialized before enabling in drm_helper_probe_single_connector_modes

In function drm_helper_probe_single_connector_modes() when we enable
polling again, if it is already uninitialized, a warning is reported.
This patch fixes the warning message by checking if poll is initialized
before enabling it.

Reported-by: kernel test robot <oliver.sang@...el.com>
Closes: https://lore.kernel.org/oe-lkp/202401191128.db8423f1-oliver.sang@intel.com
Signed-off-by: Shradha Gupta <shradhagupta@...ux.microsoft.com>
---
 Changes in v4
 * Clubbed this patch with similar patches and added a cover letter
---
 drivers/gpu/drm/drm_probe_helper.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/drm_probe_helper.c b/drivers/gpu/drm/drm_probe_helper.c
index bd76603dc387..30e6063535cd 100644
--- a/drivers/gpu/drm/drm_probe_helper.c
+++ b/drivers/gpu/drm/drm_probe_helper.c
@@ -622,8 +622,12 @@ int drm_helper_probe_single_connector_modes(struct drm_connector *connector,
 					 0);
 	}
 
-	/* Re-enable polling in case the global poll config changed. */
-	drm_kms_helper_poll_enable(dev);
+	/*
+	 * Re-enable polling in case the global poll config changed but polling
+	 * is still initialized.
+	 */
+	if (dev->mode_config.poll_enabled)
+		drm_kms_helper_poll_enable(dev);
 
 	if (connector->status == connector_status_disconnected) {
 		DRM_DEBUG_KMS("[CONNECTOR:%d:%s] disconnected\n",
-- 
2.34.1