linux-kernel - [PATCH 2/5] drm/solomon: Use drm_WARN_ON_ONCE instead of WARN

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Message-Id: <20250912-improve-ssd130x-v1-2-bc9389ed299e@gmail.com>
Date: Fri, 12 Sep 2025 18:42:10 +0200
From: Iker Pedrosa <ikerpedrosam@...il.com>
To: Javier Martinez Canillas <javierm@...hat.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>
Cc: dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org, 
 Iker Pedrosa <ikerpedrosam@...il.com>
Subject: [PATCH 2/5] drm/solomon: Use drm_WARN_ON_ONCE instead of WARN_ON

To prevent log spam, convert all instances to the DRM-specific
drm_WARN_ON_ONCE() macro. This ensures that a warning is emitted only
the first time the condition is met for a given device instance, which
is the desired behavior within the graphics subsystem.

Signed-off-by: Iker Pedrosa <ikerpedrosam@...il.com>
---
 drivers/gpu/drm/solomon/ssd130x.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/solomon/ssd130x.c b/drivers/gpu/drm/solomon/ssd130x.c
index 297593c7fd20a5a5da81f1e1fcfda9092b19cf90..c6939377ec4b5a42ce0f40d070ce60d544d8516d 100644
--- a/drivers/gpu/drm/solomon/ssd130x.c
+++ b/drivers/gpu/drm/solomon/ssd130x.c
@@ -1390,7 +1390,7 @@ static void ssd130x_primary_plane_reset(struct drm_plane *plane)
 {
 	struct ssd130x_plane_state *ssd130x_state;
 
-	WARN_ON(plane->state);
+	drm_WARN_ON_ONCE(plane->dev, plane->state);
 
 	ssd130x_state = kzalloc(sizeof(*ssd130x_state), GFP_KERNEL);
 	if (!ssd130x_state)
@@ -1405,7 +1405,7 @@ static struct drm_plane_state *ssd130x_primary_plane_duplicate_state(struct drm_
 	struct ssd130x_plane_state *old_ssd130x_state;
 	struct ssd130x_plane_state *ssd130x_state;
 
-	if (WARN_ON(!plane->state))
+	if (drm_WARN_ON_ONCE(plane->dev, !plane->state))
 		return NULL;
 
 	old_ssd130x_state = to_ssd130x_plane_state(plane->state);
@@ -1555,7 +1555,7 @@ static void ssd130x_crtc_reset(struct drm_crtc *crtc)
 {
 	struct ssd130x_crtc_state *ssd130x_state;
 
-	WARN_ON(crtc->state);
+	drm_WARN_ON_ONCE(crtc->dev, crtc->state);
 
 	ssd130x_state = kzalloc(sizeof(*ssd130x_state), GFP_KERNEL);
 	if (!ssd130x_state)
@@ -1569,7 +1569,7 @@ static struct drm_crtc_state *ssd130x_crtc_duplicate_state(struct drm_crtc *crtc
 	struct ssd130x_crtc_state *old_ssd130x_state;
 	struct ssd130x_crtc_state *ssd130x_state;
 
-	if (WARN_ON(!crtc->state))
+	if (drm_WARN_ON_ONCE(crtc->dev, !crtc->state))
 		return NULL;
 
 	old_ssd130x_state = to_ssd130x_crtc_state(crtc->state);

-- 
2.51.0