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| author | Herve Codina <herve.codina@bootlin.com> | 2023-10-20 18:30:12 +0300 |
|---|---|---|
| committer | Wolfram Sang <wsa@kernel.org> | 2023-10-21 20:56:55 +0300 |
| commit | 0fb118de5003028ad092a4e66fc6d07b86c3bc94 (patch) | |
| tree | e31ad676319b895e52c05a77baae4594f8fd17cd /drivers/i2c/muxes/i2c-demux-pinctrl.c | |
| parent | 3171d37b58a76e1febbf3f4af2d06234a98cf88b (diff) | |
| download | linux-0fb118de5003028ad092a4e66fc6d07b86c3bc94.tar.xz | |
i2c: muxes: i2c-demux-pinctrl: Use of_get_i2c_adapter_by_node()
i2c-demux-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: 50a5ba876908 ("i2c: mux: demux-pinctrl: add 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>
Diffstat (limited to 'drivers/i2c/muxes/i2c-demux-pinctrl.c')
| -rw-r--r-- | drivers/i2c/muxes/i2c-demux-pinctrl.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/i2c/muxes/i2c-demux-pinctrl.c b/drivers/i2c/muxes/i2c-demux-pinctrl.c index 22f2280eab7f..9f2e4aa28159 100644 --- a/drivers/i2c/muxes/i2c-demux-pinctrl.c +++ b/drivers/i2c/muxes/i2c-demux-pinctrl.c @@ -61,7 +61,7 @@ static int i2c_demux_activate_master(struct i2c_demux_pinctrl_priv *priv, u32 ne if (ret) goto err; - adap = of_find_i2c_adapter_by_node(priv->chan[new_chan].parent_np); + adap = of_get_i2c_adapter_by_node(priv->chan[new_chan].parent_np); if (!adap) { ret = -ENODEV; goto err_with_revert; |