linux-kernel - [PATCH 1/6] mcb: Correctly initialize the bus's device

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Message-Id: <ac4f7fa3b024c92e7ae54fa3b9691ea1bf3209cf.1462260406.git.jthumshirn@suse.de>
Date:	Tue,  3 May 2016 09:46:22 +0200
From:	Johannes Thumshirn <jthumshirn@...e.de>
To:	Greg KH <gregkh@...uxfoundation.org>
Cc:	Andreas Werner <andreas.werner@....de>,
	Linux Kernel Mailinglist <linux-kernel@...r.kernel.org>,
	Johannes Thumshirn <jthumshirn@...e.de>
Subject: [PATCH 1/6] mcb: Correctly initialize the bus's device

The mcb bus' device member wasn't correctly initialized and thus wasn't placed
correctly into the driver model.

Signed-off-by: Johannes Thumshirn <jthumshirn@...e.de>
Reviewed-by: Andreas Werner <andreas.werner@....de>
Tested-by: Andreas Werner <andreas.werner@....de>
---
 drivers/mcb/mcb-core.c | 19 ++++++++++++++++---
 include/linux/mcb.h    |  5 ++---
 2 files changed, 18 insertions(+), 6 deletions(-)

diff --git a/drivers/mcb/mcb-core.c b/drivers/mcb/mcb-core.c
index a4be451..1e336cc 100644
--- a/drivers/mcb/mcb-core.c
+++ b/drivers/mcb/mcb-core.c
@@ -187,6 +187,7 @@ struct mcb_bus *mcb_alloc_bus(struct device *carrier)
 {
 	struct mcb_bus *bus;
 	int bus_nr;
+	int rc;
 
 	bus = kzalloc(sizeof(struct mcb_bus), GFP_KERNEL);
 	if (!bus)
@@ -194,14 +195,26 @@ struct mcb_bus *mcb_alloc_bus(struct device *carrier)
 
 	bus_nr = ida_simple_get(&mcb_ida, 0, 0, GFP_KERNEL);
 	if (bus_nr < 0) {
-		kfree(bus);
-		return ERR_PTR(bus_nr);
+		rc = bus_nr;
+		goto err_free;
 	}
 
-	INIT_LIST_HEAD(&bus->children);
 	bus->bus_nr = bus_nr;
 	bus->carrier = carrier;
+
+	device_initialize(&bus->dev);
+	bus->dev.parent = carrier;
+	bus->dev.bus = &mcb_bus_type;
+
+	dev_set_name(&bus->dev, "mcb:%d", bus_nr);
+	rc = device_add(&bus->dev);
+	if (rc)
+		goto err_free;
+
 	return bus;
+err_free:
+	kfree(bus);
+	return ERR_PTR(rc);
 }
 EXPORT_SYMBOL_GPL(mcb_alloc_bus);
 
diff --git a/include/linux/mcb.h b/include/linux/mcb.h
index ed06e15..3efafbc 100644
--- a/include/linux/mcb.h
+++ b/include/linux/mcb.h
@@ -21,13 +21,12 @@ struct mcb_device;
 /**
  * struct mcb_bus - MEN Chameleon Bus
  *
- * @dev: pointer to carrier device
- * @children: the child busses
+ * @dev: bus device
+ * @carrier: pointer to carrier device
  * @bus_nr: mcb bus number
  * @get_irq: callback to get IRQ number
  */
 struct mcb_bus {
-	struct list_head children;
 	struct device dev;
 	struct device *carrier;
 	int bus_nr;
-- 
2.8.1