linux-kernel - [PATCH v6 3/4] vkms: Do not send hotplug events for same connector status

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Message-Id: <20260123-hot-plug-passup-v6-3-aaaf61d960bb@collabora.com>
Date: Fri, 23 Jan 2026 20:44:04 +0100
From: Nicolas Frattaroli <nicolas.frattaroli@...labora.com>
To: Ville Syrjälä <ville.syrjala@...ux.intel.com>, 
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>, 
 David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>, 
 Louis Chauvet <louis.chauvet@...tlin.com>, 
 Haneen Mohammed <hamohammed.sa@...il.com>, 
 Melissa Wen <melissa.srw@...il.com>, 
 Daniel Stone <daniel.stone@...labora.com>, 
 Ian Forbes <ian.forbes@...adcom.com>, 
 Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
Cc: dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org, 
 kernel@...labora.com, Nicolas Frattaroli <nicolas.frattaroli@...labora.com>, 
 Marius Vlad <marius.vlad@...labora.com>
Subject: [PATCH v6 3/4] vkms: Do not send hotplug events for same connector
 status

From: Marius Vlad <marius.vlad@...labora.com>

Only send a new hotplug event when writing to the connector status
configfs entry if the connector status changed compared to its
previous value.

Signed-off-by: Marius Vlad <marius.vlad@...labora.com>
Signed-off-by: Nicolas Frattaroli <nicolas.frattaroli@...labora.com>
---
 drivers/gpu/drm/vkms/vkms_configfs.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/vkms/vkms_configfs.c b/drivers/gpu/drm/vkms/vkms_configfs.c
index 506666e21c91..d6e203d59b45 100644
--- a/drivers/gpu/drm/vkms/vkms_configfs.c
+++ b/drivers/gpu/drm/vkms/vkms_configfs.c
@@ -549,9 +549,11 @@ static ssize_t connector_status_store(struct config_item *item,
 		return -EINVAL;
 
 	scoped_guard(mutex, &connector->dev->lock) {
+		enum drm_connector_status old_status =
+			vkms_config_connector_get_status(connector->config);
 		vkms_config_connector_set_status(connector->config, status);
 
-		if (connector->dev->enabled)
+		if (connector->dev->enabled && old_status != status)
 			vkms_trigger_connector_hotplug(connector->dev->config->dev);
 	}
 

-- 
2.52.0