[PATCH drm-misc-next v2 1/4] drm/vc4: hdmi: unlock mutex when device is unplugged

From: Danilo Krummrich
Date: Fri Aug 19 2022 - 07:09:06 EST


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@xxxxxxxxxx>
---
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