From: Herve Codina Date: Fri, 20 Oct 2023 15:30:12 +0000 (+0200) Subject: i2c: muxes: i2c-demux-pinctrl: Use of_get_i2c_adapter_by_node() X-Git-Tag: v6.6.17~3681^2~2 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=0fb118de5003028ad092a4e66fc6d07b86c3bc94;p=platform%2Fkernel%2Flinux-rpi.git 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 Cc: stable@vger.kernel.org Acked-by: Peter Rosin Reviewed-by: Jonathan Cameron Signed-off-by: Wolfram Sang --- diff --git a/drivers/i2c/muxes/i2c-demux-pinctrl.c b/drivers/i2c/muxes/i2c-demux-pinctrl.c index 22f2280..9f2e4aa 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;