lkml.org 
[lkml]   [2017]   [Aug]   [30]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 5/5] net: mdio-mux: fix unbalanced put_device
Date
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>
---
drivers/net/phy/mdio-mux.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/phy/mdio-mux.c b/drivers/net/phy/mdio-mux.c
index 9a889a529b9c..0b7d3d30ae97 100644
--- a/drivers/net/phy/mdio-mux.c
+++ b/drivers/net/phy/mdio-mux.c
@@ -117,6 +117,7 @@ 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);
@@ -186,8 +187,7 @@ int mdio_mux_init(struct device *dev,
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;
--
2.13.5
\
 
 \ /
  Last update: 2017-08-30 19:51    [W:0.269 / U:0.136 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site