Messages in this thread | | | Date | Thu, 19 Oct 2023 11:46:04 +0200 | From | Herve Codina <> | Subject | Re: [PATCH 2/3] i2c: muxes: i2c-demux-pinctrl: Use of_get_i2c_adapter_by_node() |
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Hi Peter, On Thu, 19 Oct 2023 11:26:14 +0200 Peter Rosin <peda@axentia.se> wrote:
> Hi! > > 2023-10-19 at 09:35, Herve Codina wrote: > > 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 > > overflow over zero of the parent adapter user counter. > > Perhaps "... underflow of the parent module refcount."?
Will be changed in the next iteration
> > > > > Use the dedicated function, of_get_i2c_adapter_by_node(), to handle > > correctly the module refcount. > > > > Signed-off-by: Herve Codina <herve.codina@bootlin.com> > > Good find! > > Fixes: 50a5ba876908 ("i2c: mux: demux-pinctrl: add driver") > Acked-by: Peter Rosin <peda@axentia.se> > Will be added in the next iteration.
Thanks for the review, Hervé
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