linux-kernel - [PATCH 1/4] drm: adp: Use spin_lock_irqsave for drm device event

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Message-Id: <20250416-drm_adp_fixes-v1-1-772699f13293@jannau.net>
Date: Wed, 16 Apr 2025 22:25:27 +0200
From: Janne Grunau via B4 Relay <devnull+j.jannau.net@...nel.org>
To: Sasha Finkelstein <fnkl.kernel@...il.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>, 
 Neal Gompa <neal@...pa.dev>, Alyssa Rosenzweig <alyssa@...enzweig.io>, 
 Dmitry Baryshkov <lumag@...nel.org>
Cc: dri-devel@...ts.freedesktop.org, asahi@...ts.linux.dev, 
 linux-kernel@...r.kernel.org, Janne Grunau <j@...nau.net>
Subject: [PATCH 1/4] drm: adp: Use spin_lock_irqsave for drm device
 event_lock

From: Janne Grunau <j@...nau.net>

The lock is used in the interrupt handler so use spin_lock_irqsave to
disable interrupts and avoid deadlocks with the irq handler.

Fixes: 332122eba628 ("drm: adp: Add Apple Display Pipe driver")
Signed-off-by: Janne Grunau <j@...nau.net>
---
 drivers/gpu/drm/adp/adp_drv.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/adp/adp_drv.c b/drivers/gpu/drm/adp/adp_drv.c
index c98c647f981d5383149647126762a5cdec8f4e4b..157298a8ff42b95275411dd4a7a0c70780fd86fd 100644
--- a/drivers/gpu/drm/adp/adp_drv.c
+++ b/drivers/gpu/drm/adp/adp_drv.c
@@ -310,6 +310,7 @@ static void adp_crtc_atomic_flush(struct drm_crtc *crtc,
 				  struct drm_atomic_state *state)
 {
 	u32 frame_num = 1;
+	unsigned long flags;
 	struct adp_drv_private *adp = crtc_to_adp(crtc);
 	struct drm_crtc_state *new_state = drm_atomic_get_new_crtc_state(state, crtc);
 	u64 new_size = ALIGN(new_state->mode.hdisplay *
@@ -330,13 +331,13 @@ static void adp_crtc_atomic_flush(struct drm_crtc *crtc,
 	}
 	writel(ADBE_FIFO_SYNC | frame_num, adp->be + ADBE_FIFO);
 	//FIXME: use adbe flush interrupt
-	spin_lock_irq(&crtc->dev->event_lock);
+	spin_lock_irqsave(&crtc->dev->event_lock, flags);
 	if (crtc->state->event) {
 		drm_crtc_vblank_get(crtc);
 		adp->event = crtc->state->event;
 	}
 	crtc->state->event = NULL;
-	spin_unlock_irq(&crtc->dev->event_lock);
+	spin_unlock_irqrestore(&crtc->dev->event_lock, flags);
 }
 
 static const struct drm_crtc_funcs adp_crtc_funcs = {

-- 
2.49.0