linux-kernel - [PATCH drm-misc-next 1/3] drm/vc4: hdmi: unlock mutex when device is unplugged

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Date:   Fri, 19 Aug 2022 02:29:03 +0200
From:   Danilo Krummrich <dakr@...hat.com>
To:     daniel@...ll.ch, airlied@...ux.ie, tzimmermann@...e.de,
        mripard@...nel.org
Cc:     dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Danilo Krummrich <dakr@...hat.com>
Subject: [PATCH drm-misc-next 1/3] drm/vc4: hdmi: unlock mutex when device is unplugged

In vc4_hdmi_encoder_{pre,post}_crtc_enable() commit cd00ed5187bf
("drm/vc4: hdmi: Protect device resources after removal") missed to
unlock the mutex before returning due to drm_dev_enter() indicating the
device being unplugged.

Fixes: cd00ed5187bf ("drm/vc4: hdmi: Protect device resources after removal")
Signed-off-by: Danilo Krummrich <dakr@...hat.com>
---
 drivers/gpu/drm/vc4/vc4_hdmi.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.c b/drivers/gpu/drm/vc4/vc4_hdmi.c
index 84e5a91c2ea7..4d3ff51ad2a8 100644
--- a/drivers/gpu/drm/vc4/vc4_hdmi.c
+++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
@@ -1425,7 +1425,7 @@ static void vc4_hdmi_encoder_pre_crtc_enable(struct drm_encoder *encoder,
 	mutex_lock(&vc4_hdmi->mutex);
 
 	if (!drm_dev_enter(drm, &idx))
-		return;
+		goto out;
 
 	if (vc4_hdmi->variant->csc_setup)
 		vc4_hdmi->variant->csc_setup(vc4_hdmi, conn_state, mode);
@@ -1436,6 +1436,7 @@ static void vc4_hdmi_encoder_pre_crtc_enable(struct drm_encoder *encoder,
 
 	drm_dev_exit(idx);
 
+out:
 	mutex_unlock(&vc4_hdmi->mutex);
 }
 
@@ -1455,7 +1456,7 @@ static void vc4_hdmi_encoder_post_crtc_enable(struct drm_encoder *encoder,
 	mutex_lock(&vc4_hdmi->mutex);
 
 	if (!drm_dev_enter(drm, &idx))
-		return;
+		goto out;
 
 	spin_lock_irqsave(&vc4_hdmi->hw_lock, flags);
 
@@ -1516,6 +1517,8 @@ static void vc4_hdmi_encoder_post_crtc_enable(struct drm_encoder *encoder,
 	vc4_hdmi_enable_scrambling(encoder);
 
 	drm_dev_exit(idx);
+
+out:
 	mutex_unlock(&vc4_hdmi->mutex);
 }
 
-- 
2.37.2