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| author | Herve Codina <herve.codina@bootlin.com> | 2023-10-20 17:30:13 +0200 |
|---|---|---|
| committer | Wolfram Sang <wsa@kernel.org> | 2023-10-21 19:57:18 +0200 |
| commit | 3dc0ec46f6e7511fc4fdf6b6cda439382bc957f1 (patch) | |
| tree | da3d4846e51dd22fce235a2944c7ce8db9578f63 /drivers/i2c | |
| parent | 0fb118de5003028ad092a4e66fc6d07b86c3bc94 (diff) | |
| download | lwn-3dc0ec46f6e7511fc4fdf6b6cda439382bc957f1.tar.gz lwn-3dc0ec46f6e7511fc4fdf6b6cda439382bc957f1.zip | |
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: 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>
Diffstat (limited to 'drivers/i2c')
| -rw-r--r-- | drivers/i2c/muxes/i2c-mux-gpmux.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/i2c/muxes/i2c-mux-gpmux.c b/drivers/i2c/muxes/i2c-mux-gpmux.c index baccf4bfaf02..8305661e1253 100644 --- a/drivers/i2c/muxes/i2c-mux-gpmux.c +++ b/drivers/i2c/muxes/i2c-mux-gpmux.c @@ -52,7 +52,7 @@ static struct i2c_adapter *mux_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); |