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| author |   Corentin Labbe <clabbe.montjoie@gmail.com> | 2017-09-01 13:56:04 +0200 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2017-09-01 10:26:31 -0700 |
| commit | 60f786525032432af1b7d9b8935cb12936244ccd (patch) | |
| tree | ea3186a5c85b0aef63557f9fab44929841df5fd9 /drivers/net/phy/mdio-mux.c | |
| parent | net: mdio-mux-mmioreg: Can handle 8/16/32 bits registers (diff) | |
| download | linux-dev-60f786525032432af1b7d9b8935cb12936244ccd.tar.xz linux-dev-60f786525032432af1b7d9b8935cb12936244ccd.zip | |
net: mdio-mux: fix unbalanced put_device
mdio_mux_uninit() call put_device (unconditionally) because of
of_mdio_find_bus() in mdio_mux_init.
But of_mdio_find_bus is only called if mux_bus is empty.
If mux_bus is set, mdio_mux_uninit will print a "refcount_t: underflow"
trace.
This patch add a get_device in the other branch of "if (mux_bus)".
Signed-off-by: Corentin Labbe <clabbe.montjoie@gmail.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/phy/mdio-mux.c')
| -rw-r--r-- | drivers/net/phy/mdio-mux.c | 6 |
1 files changed, 2 insertions, 4 deletions
diff --git a/drivers/net/phy/mdio-mux.c b/drivers/net/phy/mdio-mux.c index 282828551bdd..6f75e9f27fed 100644 --- a/drivers/net/phy/mdio-mux.c +++ b/drivers/net/phy/mdio-mux.c @@ -116,6 +116,7 @@ int mdio_mux_init(struct device *dev, } else { parent_bus_node = NULL; parent_bus = mux_bus; + get_device(&parent_bus->dev); } pb = devm_kzalloc(dev, sizeof(*pb), GFP_KERNEL); @@ -184,9 +185,7 @@ int mdio_mux_init(struct device *dev, dev_err(dev, "Error: No acceptable child buses found\n"); devm_kfree(dev, pb); err_pb_kz: - /* balance the reference of_mdio_find_bus() took */ - if (!mux_bus) - put_device(&parent_bus->dev); + put_device(&parent_bus->dev); err_parent_bus: of_node_put(parent_bus_node); return ret_val; @@ -204,7 +203,6 @@ void mdio_mux_uninit(void *mux_handle) cb = cb->next; } - /* balance the reference of_mdio_find_bus() in mdio_mux_init() took */ put_device(&pb->mii_bus->dev); } EXPORT_SYMBOL_GPL(mdio_mux_uninit); |