i2c: muxes: i2c-mux-gpmux: Use of_get_i2c_adapter_by_node()
i2c-mux-gpmux uses the pair of_find_i2c_adapter_by_node() /
i2c_put_adapter(). These pair alone is not correct to properly lock the
I2C parent adapter.
Indeed, i2c_put_adapter() decrements the module refcount while
of_find_i2c_adapter_by_node() does not increment it. This leads to an
underflow of the parent module refcount.
Use the dedicated function, of_get_i2c_adapter_by_node(), to handle
correctly the module refcount.
Fixes: ac8498f0ce
("i2c: i2c-mux-gpmux: new driver")
Signed-off-by: Herve Codina <herve.codina@bootlin.com>
Cc: stable@vger.kernel.org
Acked-by: Peter Rosin <peda@axentia.se>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
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@ -52,7 +52,7 @@ static struct i2c_adapter *mux_parent_adapter(struct device *dev)
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dev_err(dev, "Cannot parse i2c-parent\n");
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return ERR_PTR(-ENODEV);
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}
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parent = of_find_i2c_adapter_by_node(parent_np);
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parent = of_get_i2c_adapter_by_node(parent_np);
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of_node_put(parent_np);
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if (!parent)
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return ERR_PTR(-EPROBE_DEFER);
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