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From:   Sasha Levin <Alexander.Levin@microsoft.com>
To:     "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "stable@vger.kernel.org" <stable@vger.kernel.org>
CC:     Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>,
        Sasha Levin <Alexander.Levin@microsoft.com>
Subject: [PATCH AUTOSEL for 4.9 107/219] drm: rcar-du: Handle event when
 disabling CRTCs
Thread-Topic: [PATCH AUTOSEL for 4.9 107/219] drm: rcar-du: Handle event when
 disabling CRTCs
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Date:   Sat, 3 Mar 2018 22:28:58 +0000
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From: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>

[ Upstream commit 6dd47cfd03a058d08b8caffb06194aa0eb109cf1 ]

The driver currently handles vblank events only when updating planes on
a CRTC. The atomic update API however allows requesting an event when
disabling a CRTC. This currently leads to event objects being leaked in
the kernel and to events not being sent out. Fix it.

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
---
 drivers/gpu/drm/rcar-du/rcar_du_crtc.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/gpu/drm/rcar-du/rcar_du_crtc.c b/drivers/gpu/drm/rcar-=
du/rcar_du_crtc.c
index 3322b157106d..1c4d95dea887 100644
--- a/drivers/gpu/drm/rcar-du/rcar_du_crtc.c
+++ b/drivers/gpu/drm/rcar-du/rcar_du_crtc.c
@@ -512,6 +512,13 @@ static void rcar_du_crtc_disable(struct drm_crtc *crtc=
)
 	rcar_du_crtc_stop(rcrtc);
 	rcar_du_crtc_put(rcrtc);
=20
+	spin_lock_irq(&crtc->dev->event_lock);
+	if (crtc->state->event) {
+		drm_crtc_send_vblank_event(crtc, crtc->state->event);
+		crtc->state->event =3D NULL;
+	}
+	spin_unlock_irq(&crtc->dev->event_lock);
+
 	rcrtc->outputs =3D 0;
 }
=20
--=20
2.14.1