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net: mdio: fix unbalanced fwnode reference count in mdio_device_release()

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[ Upstream commit cb37617687 ]

There is warning report about of_node refcount leak
while probing mdio device:

OF: ERROR: memory leak, expected refcount 1 instead of 2,
of_node_get()/of_node_put() unbalanced - destroy cset entry:
attach overlay node /spi/soc@0/mdio@710700c0/ethernet@4

In of_mdiobus_register_device(), we increase fwnode refcount
by fwnode_handle_get() before associating the of_node with
mdio device, but it has never been decreased in normal path.
Since that, in mdio_device_release(), it needs to call
fwnode_handle_put() in addition instead of calling kfree()
directly.

After above, just calling mdio_device_free() in the error handle
path of of_mdiobus_register_device() is enough to keep the
refcount balanced.

Fixes: a9049e0c51 ("mdio: Add support for mdio drivers.")
Signed-off-by: Zeng Heng <zengheng4@huawei.com>
Reviewed-by: Yang Yingliang <yangyingliang@huawei.com>
Reviewed-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Link: https://lore.kernel.org/r/20221203073441.3885317-1-zengheng4@huawei.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Zeng Heng 2022-12-03 15:34:41 +08:00 committed by Greg Kroah-Hartman
parent 6f4798ac9c
commit 1685417774
2 changed files with 4 additions and 1 deletions
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3
drivers/net/mdio/of_mdio.c
View File

@ -68,8 +68,9 @@ static int of_mdiobus_register_device(struct mii_bus *mdio,
/* All data is now stored in the mdiodev struct; register it. */
rc = mdio_device_register(mdiodev);
if (rc) {
device_set_node(&mdiodev->dev, NULL);
fwnode_handle_put(fwnode);
mdio_device_free(mdiodev);
of_node_put(child);
return rc;
}

2
drivers/net/phy/mdio_device.c
View File

@ -21,6 +21,7 @@
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/unistd.h>
#include <linux/property.h>
void mdio_device_free(struct mdio_device *mdiodev)
{
@ -30,6 +31,7 @@ EXPORT_SYMBOL(mdio_device_free);
static void mdio_device_release(struct device *dev)
{
fwnode_handle_put(dev->fwnode);
kfree(to_mdio_device(dev));
}