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Subject[PATCH v2] mux: core: Fix double get_device()
Date
class_find_device already does a get_device on the returned device.
So the device returned by of_find_mux_chip_by_node is already referenced
and we should not reference it again (and unref it on error).

Also rename of_find_mux_chip_by_node to of_get_mux_chip_by_node to
make it clear that it returns a reference.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
---
Changes in v2:
-Do not rename of_find_mux_chip_by_node
---
drivers/mux/core.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/mux/core.c b/drivers/mux/core.c
index 2260063b0ea8..6e5cf9d9cd99 100644
--- a/drivers/mux/core.c
+++ b/drivers/mux/core.c
@@ -413,6 +413,7 @@ static int of_dev_node_match(struct device *dev, const void *data)
return dev->of_node == data;
}

+/* Note this function returns a reference to the mux_chip dev. */
static struct mux_chip *of_find_mux_chip_by_node(struct device_node *np)
{
struct device *dev;
@@ -466,6 +467,7 @@ struct mux_control *mux_control_get(struct device *dev, const char *mux_name)
(!args.args_count && (mux_chip->controllers > 1))) {
dev_err(dev, "%pOF: wrong #mux-control-cells for %pOF\n",
np, args.np);
+ put_device(&mux_chip->dev);
return ERR_PTR(-EINVAL);
}

@@ -476,10 +478,10 @@ struct mux_control *mux_control_get(struct device *dev, const char *mux_name)
if (controller >= mux_chip->controllers) {
dev_err(dev, "%pOF: bad mux controller %u specified in %pOF\n",
np, controller, args.np);
+ put_device(&mux_chip->dev);
return ERR_PTR(-EINVAL);
}

- get_device(&mux_chip->dev);
return &mux_chip->mux[controller];
}
EXPORT_SYMBOL_GPL(mux_control_get);
--
2.13.5
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