Patch "drm/vc4: drv: Call component_unbind_all()" has been added to the 6.0-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

    drm/vc4: drv: Call component_unbind_all()

to the 6.0-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     drm-vc4-drv-call-component_unbind_all.patch
and it can be found in the queue-6.0 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 851c5d9accd06c1405a4346e783deed0eac1406c
Author: Maxime Ripard <maxime@xxxxxxxxxx>
Date:   Mon Jul 11 19:38:42 2022 +0200

    drm/vc4: drv: Call component_unbind_all()
    
    [ Upstream commit 6cf61bf49c9bdb9ba2d33be812d90dd406326c6c ]
    
    While we were using the component framework to deal with all the DRM
    subdevices, we were not calling component_unbind_all().
    
    This leads to none of the subdevices freeing up their resources as part of
    their unbind() or device managed hooks.
    
    Fixes: c8b75bca92cb ("drm/vc4: Add KMS support for Raspberry Pi.")
    Acked-by: Thomas Zimmermann <tzimmermann@xxxxxxx>
    Reviewed-by: Dave Stevenson <dave.stevenson@xxxxxxxxxxxxxxx>
    Signed-off-by: Maxime Ripard <maxime@xxxxxxxxxx>
    Link: https://lore.kernel.org/r/20220711173939.1132294-13-maxime@xxxxxxxxxx
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/gpu/drm/vc4/vc4_drv.c b/drivers/gpu/drm/vc4/vc4_drv.c
index 292d1b6a01b6..6b8dfa1e7650 100644
--- a/drivers/gpu/drm/vc4/vc4_drv.c
+++ b/drivers/gpu/drm/vc4/vc4_drv.c
@@ -267,6 +267,13 @@ static void vc4_match_add_drivers(struct device *dev,
 	}
 }
 
+static void vc4_component_unbind_all(void *ptr)
+{
+	struct vc4_dev *vc4 = ptr;
+
+	component_unbind_all(vc4->dev, &vc4->base);
+}
+
 static const struct of_device_id vc4_dma_range_matches[] = {
 	{ .compatible = "brcm,bcm2711-hvs" },
 	{ .compatible = "brcm,bcm2835-hvs" },
@@ -310,6 +317,7 @@ static int vc4_drm_bind(struct device *dev)
 	if (IS_ERR(vc4))
 		return PTR_ERR(vc4);
 	vc4->is_vc5 = is_vc5;
+	vc4->dev = dev;
 
 	drm = &vc4->base;
 	platform_set_drvdata(pdev, drm);
@@ -360,6 +368,10 @@ static int vc4_drm_bind(struct device *dev)
 	if (ret)
 		return ret;
 
+	ret = devm_add_action_or_reset(dev, vc4_component_unbind_all, vc4);
+	if (ret)
+		return ret;
+
 	ret = vc4_plane_create_additional_planes(drm);
 	if (ret)
 		goto unbind_all;
@@ -380,8 +392,6 @@ static int vc4_drm_bind(struct device *dev)
 	return 0;
 
 unbind_all:
-	component_unbind_all(dev, drm);
-
 	return ret;
 }
 
diff --git a/drivers/gpu/drm/vc4/vc4_drv.h b/drivers/gpu/drm/vc4/vc4_drv.h
index 1beb96b77b8c..950056b83843 100644
--- a/drivers/gpu/drm/vc4/vc4_drv.h
+++ b/drivers/gpu/drm/vc4/vc4_drv.h
@@ -76,6 +76,7 @@ struct vc4_perfmon {
 
 struct vc4_dev {
 	struct drm_device base;
+	struct device *dev;
 
 	bool is_vc5;