linux-kernel - [PATCH 1/2] component: add optional cleanup function

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Message-Id: <83a28282a3f745a4cd4ca77d0593ad2e61359a5d.1539120077.git.stefan@agner.ch>
Date:   Tue,  9 Oct 2018 23:30:48 +0200
From:   Stefan Agner <stefan@...er.ch>
To:     p.zabel@...gutronix.de, airlied@...ux.ie,
        gregkh@...uxfoundation.org
Cc:     rafael@...nel.org, linux@...linux.org.uk,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Stefan Agner <stefan@...er.ch>
Subject: [PATCH 1/2] component: add optional cleanup function

Add optional cleanup function on master level. This allows the
master to call framework level cleanup functions in case binding
of any component failed before the previously successfully bound
components get unbound.

Signed-off-by: Stefan Agner <stefan@...er.ch>
---
Hi,

This is an attempt to fix the issue reported in:
"drm/imx: Crash in drm_mode_config_cleanup"

--
Stefan

 drivers/base/component.c  | 4 ++++
 include/linux/component.h | 1 +
 2 files changed, 5 insertions(+)

diff --git a/drivers/base/component.c b/drivers/base/component.c
index 8946dfee4768..5350d931a663 100644
--- a/drivers/base/component.c
+++ b/drivers/base/component.c
@@ -535,6 +535,10 @@ int component_bind_all(struct device *master_dev, void *data)
 				break;
 		}
 
+	/* Allow the master to call framework cleanup functions */
+	if (master->ops->cleanup)
+		master->ops->cleanup(master->dev);
+
 	if (ret != 0) {
 		for (; i--; )
 			if (!master->match->compare[i].duplicate) {
diff --git a/include/linux/component.h b/include/linux/component.h
index e71fbbbc74e2..800534b52165 100644
--- a/include/linux/component.h
+++ b/include/linux/component.h
@@ -24,6 +24,7 @@ struct master;
 struct component_master_ops {
 	int (*bind)(struct device *master);
 	void (*unbind)(struct device *master);
+	void (*cleanup)(struct device *master);
 };
 
 void component_master_del(struct device *,
-- 
2.19.1