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| author | Herve Codina <herve.codina@bootlin.com> | 2023-10-20 18:30:11 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-11-08 13:22:16 +0300 |
| commit | 3db13032bfc007e983889f354b39d1365dd5992d (patch) | |
| tree | 9bc3ce5a53df2b82e55690a79ecf056a48464b7f | |
| parent | aa6af0643600dc760f1e67e17da859363de3a5b5 (diff) | |
| download | linux-3db13032bfc007e983889f354b39d1365dd5992d.tar.xz | |
i2c: muxes: i2c-mux-pinctrl: Use of_get_i2c_adapter_by_node()
commit 3171d37b58a76e1febbf3f4af2d06234a98cf88b upstream.
i2c-mux-pinctrl 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: c4aee3e1b0de ("i2c: mux: pinctrl: remove platform_data")
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>
| -rw-r--r-- | drivers/i2c/muxes/i2c-mux-pinctrl.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/i2c/muxes/i2c-mux-pinctrl.c b/drivers/i2c/muxes/i2c-mux-pinctrl.c index cc6818aabab5..821e5cd49757 100644 --- a/drivers/i2c/muxes/i2c-mux-pinctrl.c +++ b/drivers/i2c/muxes/i2c-mux-pinctrl.c @@ -73,7 +73,7 @@ static struct i2c_adapter *i2c_mux_pinctrl_parent_adapter(struct device *dev) dev_err(dev, "Cannot parse i2c-parent\n"); 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); if (!parent) return ERR_PTR(-EPROBE_DEFER); |