linux-kernel - [PATCH 2/3] drivers: base: Propagate errors through the transport component

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Message-Id: <20200106185817.640331-3-krisman@collabora.com>
Date:   Mon,  6 Jan 2020 13:58:16 -0500
From:   Gabriel Krisman Bertazi <krisman@...labora.com>
To:     gregkh@...uxfoundation.org
Cc:     rafael@...nel.org, lduncan@...e.com, cleech@...hat.com,
        jejb@...ux.ibm.com, martin.petersen@...cle.com,
        open-iscsi@...glegroups.com, linux-kernel@...r.kernel.org,
        linux-scsi@...r.kernel.org,
        Gabriel Krisman Bertazi <krisman@...labora.com>,
        kernel@...labora.com
Subject: [PATCH 2/3] drivers: base: Propagate errors through the transport component

The transport registration may fail.  Make sure the errors are
propagated to the callers.

Signed-off-by: Gabriel Krisman Bertazi <krisman@...labora.com>
---
 drivers/base/transport_class.c  | 11 ++++++++---
 include/linux/transport_class.h |  6 +++---
 2 files changed, 11 insertions(+), 6 deletions(-)

diff --git a/drivers/base/transport_class.c b/drivers/base/transport_class.c
index 5ed86ded6e6b..ccc86206e508 100644
--- a/drivers/base/transport_class.c
+++ b/drivers/base/transport_class.c
@@ -30,6 +30,10 @@
 #include <linux/attribute_container.h>
 #include <linux/transport_class.h>
 
+static int transport_remove_classdev(struct attribute_container *cont,
+				     struct device *dev,
+				     struct device *classdev);
+
 /**
  * transport_class_register - register an initial transport class
  *
@@ -172,10 +176,11 @@ static int transport_add_class_device(struct attribute_container *cont,
  * routine is simply a trigger point used to add the device to the
  * system and register attributes for it.
  */
-
-void transport_add_device(struct device *dev)
+int transport_add_device(struct device *dev)
 {
-	attribute_container_device_trigger(dev, transport_add_class_device);
+	return attribute_container_device_trigger_safe(dev,
+					transport_add_class_device,
+					transport_remove_classdev);
 }
 EXPORT_SYMBOL_GPL(transport_add_device);
 
diff --git a/include/linux/transport_class.h b/include/linux/transport_class.h
index a9c59761927b..63076fb835e3 100644
--- a/include/linux/transport_class.h
+++ b/include/linux/transport_class.h
@@ -62,16 +62,16 @@ struct transport_container {
 	container_of(x, struct transport_container, ac)
 
 void transport_remove_device(struct device *);
-void transport_add_device(struct device *);
+int transport_add_device(struct device *);
 void transport_setup_device(struct device *);
 void transport_configure_device(struct device *);
 void transport_destroy_device(struct device *);
 
-static inline void
+static inline int
 transport_register_device(struct device *dev)
 {
 	transport_setup_device(dev);
-	transport_add_device(dev);
+	return transport_add_device(dev);
 }
 
 static inline void
-- 
2.24.1