linux-kernel - [PATCH 4.17 045/324] drm/arm/malidp: Ensure that the crtcs are shutdown before removing any encoder/connector

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Message-Id: <20180823074958.070155245@linuxfoundation.org>
Date:   Thu, 23 Aug 2018 09:51:51 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Ayan Kumar Halder <ayan.halder@....com>,
        Liviu Dudau <liviu.dudau@....com>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 4.17 045/324] drm/arm/malidp: Ensure that the crtcs are shutdown before removing any encoder/connector

4.17-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Ayan Kumar Halder <ayan.halder@....com>

[ Upstream commit 109c4d18e57445afcaf728b8716a69375a3daab2 ]

One needs to ensure that the crtcs are shutdown so that the
drm_crtc_state->connector_mask reflects that no connectors
are currently active. Further, it reduces the reference
count for each connector. This ensures that the connectors
and encoders can be cleanly removed either when _unbind
is called for the corresponding drivers or by
drm_mode_config_cleanup().
We need drm_atomic_helper_shutdown() to be called before
component_unbind_all() otherwise the connectors attached to the
component device will have the wrong reference count value and will not
be cleanly removed.

Signed-off-by: Ayan Kumar Halder <ayan.halder@....com>
Acked-by: Liviu Dudau <liviu.dudau@....com>
Signed-off-by: Liviu Dudau <liviu.dudau@....com>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/gpu/drm/arm/malidp_drv.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/gpu/drm/arm/malidp_drv.c
+++ b/drivers/gpu/drm/arm/malidp_drv.c
@@ -278,7 +278,6 @@ static int malidp_init(struct drm_device
 
 static void malidp_fini(struct drm_device *drm)
 {
-	drm_atomic_helper_shutdown(drm);
 	drm_mode_config_cleanup(drm);
 }
 
@@ -646,6 +645,7 @@ vblank_fail:
 	malidp_de_irq_fini(drm);
 	drm->irq_enabled = false;
 irq_init_fail:
+	drm_atomic_helper_shutdown(drm);
 	component_unbind_all(dev, drm);
 bind_fail:
 	of_node_put(malidp->crtc.port);
@@ -681,6 +681,7 @@ static void malidp_unbind(struct device
 	malidp_se_irq_fini(drm);
 	malidp_de_irq_fini(drm);
 	drm->irq_enabled = false;
+	drm_atomic_helper_shutdown(drm);
 	component_unbind_all(dev, drm);
 	of_node_put(malidp->crtc.port);
 	malidp->crtc.port = NULL;