[PATCH] component: allow missing unbind callback

[Marco Felsch]

The component framework reuses the devres managed functions. There is no
need to specify an unbind() callback if the driver only wants to release
the devres managed resources. The bind/unbind is like the probe/remove
pair. The bind/probe is necessary and the unbind/remove is optional.

Signed-off-by: Marco Felsch <m.felsch@xxxxxxxxxxxxxx>
Reviewed-by: Philipp Zabel <p.zabel@xxxxxxxxxxxxxx>
---
 drivers/base/component.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/base/component.c b/drivers/base/component.c
index c7879f5ae2fb..e97704104784 100644
--- a/drivers/base/component.c
+++ b/drivers/base/component.c
@@ -528,7 +528,8 @@ static void component_unbind(struct component *component,
 {
 	WARN_ON(!component->bound);
 
-	component->ops->unbind(component->dev, master->dev, data);
+	if (component->ops && component->ops->unbind)
+		component->ops->unbind(component->dev, master->dev, data);
 	component->bound = false;
 
 	/* Release all resources claimed in the binding of this component */
-- 
2.20.1