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i2c: muxes: i2c-mux-gpmux: Use of_get_i2c_adapter_by_node()

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commit 3dc0ec46f6e7511fc4fdf6b6cda439382bc957f1 upstream.

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: ac8498f0ce53 ("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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Herve Codina 2023-10-20 17:30:13 +02:00 • committed by Ksawlii
parent 8e2e434a9d
commit 48f3e98c0e
1 changed files with 1 additions and 1 deletions
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2
drivers/i2c/muxes/i2c-mux-gpmux.c
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@ -52,7 +52,7 @@ static struct i2c_adapter *mux_parent_adapter(struct device *dev)
dev_err(dev, "Cannot parse i2c-parent\n"); dev_err(dev, "Cannot parse i2c-parent\n");
return ERR_PTR(-ENODEV); return ERR_PTR(-ENODEV);
} }
parent = of_find_i2c_adapter_by_node(parent_np); parent = of_get_i2c_adapter_by_node(parent_np);
of_node_put(parent_np); of_node_put(parent_np);
if (!parent) if (!parent)
return ERR_PTR(-EPROBE_DEFER); return ERR_PTR(-EPROBE_DEFER);