linux-kernel - [PATCH 1/1] mcb: Do not add the mcb_bus_type to the mcb

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Date:   Mon, 10 Jul 2023 16:57:52 +0200
From:   Johannes Thumshirn <jth@...nel.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org,
        Rodríguez Barbarin, José Javier 
        <JoseJavier.Rodriguez@...gon.com>,
        Jorge Sanjuan Garcia <jorge.sanjuangarcia@...gon.com>,
        Javier Rodriguez <josejavier.rodriguez@...gon.com>,
        Johannes Thumshirn <jth@...nel.org>
Subject: [PATCH 1/1] mcb: Do not add the mcb_bus_type to the mcb_bus itself

From: Rodríguez Barbarin, José Javier <JoseJavier.Rodriguez@...gon.com>

When allocating a new mcb_bus the bus_type is added to the mcb_bus
itself, causing an issue when calling mcb_bus_add_devices().
This function is not only called for each mcb_device under the
mcb_bus but for the bus itself.

This causes a crash when freeing the ida resources as the bus numbering
gets corrupted due to a wrong cast of structs mcb_bus and mcb_device.

Make the release of the mcb devices and their mcb bus explicit.

Co-developed-by: Jorge Sanjuan Garcia <jorge.sanjuangarcia@...gon.com>
Signed-off-by: Jorge Sanjuan Garcia <jorge.sanjuangarcia@...gon.com>
Signed-off-by: Javier Rodriguez <josejavier.rodriguez@...gon.com>
Signed-off-by: Johannes Thumshirn <jth@...nel.org>
---
 drivers/mcb/mcb-core.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/mcb/mcb-core.c b/drivers/mcb/mcb-core.c
index 978fdfc19a06..d4535b8aea1d 100644
--- a/drivers/mcb/mcb-core.c
+++ b/drivers/mcb/mcb-core.c
@@ -251,6 +251,12 @@ int mcb_device_register(struct mcb_bus *bus, struct mcb_device *dev)
 }
 EXPORT_SYMBOL_NS_GPL(mcb_device_register, MCB);
 
+
+static void mcb_bus_unregister(struct mcb_bus *bus)
+{
+	device_unregister(&bus->dev);
+}
+
 static void mcb_free_bus(struct device *dev)
 {
 	struct mcb_bus *bus = to_mcb_bus(dev);
@@ -286,7 +292,6 @@ struct mcb_bus *mcb_alloc_bus(struct device *carrier)
 
 	device_initialize(&bus->dev);
 	bus->dev.parent = carrier;
-	bus->dev.bus = &mcb_bus_type;
 	bus->dev.type = &mcb_carrier_device_type;
 	bus->dev.release = &mcb_free_bus;
 
@@ -322,6 +327,7 @@ static void mcb_devices_unregister(struct mcb_bus *bus)
 void mcb_release_bus(struct mcb_bus *bus)
 {
 	mcb_devices_unregister(bus);
+	mcb_bus_unregister(bus);
 }
 EXPORT_SYMBOL_NS_GPL(mcb_release_bus, MCB);
 
-- 
2.40.1