linux-kernel - [PATCH v3 3/4] drm/bridge: Add devm_drm_bridge

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Message-Id: <20220510122726.v3.3.Iba4b9bf6c7a1ee5ea2835ad7bd5eaf84d7688520@changeid>
Date:   Tue, 10 May 2022 12:29:43 -0700
From:   Douglas Anderson <dianders@...omium.org>
To:     dri-devel@...ts.freedesktop.org
Cc:     Hsin-Yi Wang <hsinyi@...omium.org>,
        Abhinav Kumar <quic_abhinavk@...cinc.com>,
        Philip Chen <philipchen@...omium.org>,
        Sankeerth Billakanti <quic_sbillaka@...cinc.com>,
        Robert Foss <robert.foss@...aro.org>,
        freedreno@...ts.freedesktop.org,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        linux-arm-msm@...r.kernel.org, Stephen Boyd <swboyd@...omium.org>,
        Douglas Anderson <dianders@...omium.org>,
        Daniel Vetter <daniel@...ll.ch>,
        David Airlie <airlied@...ux.ie>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        linux-kernel@...r.kernel.org
Subject: [PATCH v3 3/4] drm/bridge: Add devm_drm_bridge_add()

This adds a devm managed version of drm_bridge_add(). Like other
"devm" function listed in drm_bridge.h, this function takes an
explicit "dev" to use for the lifetime management. A few notes:
* In general we have a "struct device" for bridges that makes a good
  candidate for where the lifetime matches exactly what we want.
* The "bridge->dev->dev" device appears to be the encoder
  device. That's not the right device to use for lifetime management.

Suggested-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Signed-off-by: Douglas Anderson <dianders@...omium.org>
---

Changes in v3:
- Patch ("drm/bridge: Add devm_drm_bridge_add()") new for v3.

 drivers/gpu/drm/drm_bridge.c | 23 +++++++++++++++++++++++
 include/drm/drm_bridge.h     |  1 +
 2 files changed, 24 insertions(+)

diff --git a/drivers/gpu/drm/drm_bridge.c b/drivers/gpu/drm/drm_bridge.c
index c96847fc0ebc..e275b4ca344b 100644
--- a/drivers/gpu/drm/drm_bridge.c
+++ b/drivers/gpu/drm/drm_bridge.c
@@ -170,6 +170,29 @@ void drm_bridge_add(struct drm_bridge *bridge)
 }
 EXPORT_SYMBOL(drm_bridge_add);
 
+static void drm_bridge_remove_void(void *bridge)
+{
+	drm_bridge_remove(bridge);
+}
+
+/**
+ * devm_drm_bridge_add - devm managed version of drm_bridge_add()
+ *
+ * @dev: device to tie the bridge lifetime to
+ * @bridge: bridge control structure
+ *
+ * This is the managed version of drm_bridge_add() which automatically
+ * calls drm_bridge_remove() when @dev is unbound.
+ *
+ * Return: 0 if no error or negative error code.
+ */
+int devm_drm_bridge_add(struct device *dev, struct drm_bridge *bridge)
+{
+	drm_bridge_add(bridge);
+	return devm_add_action_or_reset(dev, drm_bridge_remove_void, bridge);
+}
+EXPORT_SYMBOL(devm_drm_bridge_add);
+
 /**
  * drm_bridge_remove - remove the given bridge from the global bridge list
  *
diff --git a/include/drm/drm_bridge.h b/include/drm/drm_bridge.h
index f27b4060faa2..42aec8612f37 100644
--- a/include/drm/drm_bridge.h
+++ b/include/drm/drm_bridge.h
@@ -796,6 +796,7 @@ drm_priv_to_bridge(struct drm_private_obj *priv)
 }
 
 void drm_bridge_add(struct drm_bridge *bridge);
+int devm_drm_bridge_add(struct device *dev, struct drm_bridge *bridge);
 void drm_bridge_remove(struct drm_bridge *bridge);
 int drm_bridge_attach(struct drm_encoder *encoder, struct drm_bridge *bridge,
 		      struct drm_bridge *previous,
-- 
2.36.0.550.gb090851708-goog