On Sun, May 08, 2016 at 08:49:27AM +0200, H. Nikolaus Schaller wrote:
> Hi Dmitry,
>
> > Am 20.04.2016 um 11:03 schrieb H. Nikolaus Schaller <hns@xxxxxxxxxxxxx>:
> >
> >
> >> Am 19.04.2016 um 19:06 schrieb Dmitry Torokhov <dmitry.torokhov@xxxxxxxxx>:
> >>
> >> On Tue, Apr 19, 2016 at 09:43:08AM +0200, H. Nikolaus Schaller wrote:
> >>>
> >>>> Am 18.04.2016 um 23:22 schrieb Dmitry Torokhov <dmitry.torokhov@xxxxxxxxx>:
> >>>>
> >>>> On Mon, Apr 18, 2016 at 09:55:37PM +0200, H. Nikolaus Schaller wrote:
> >>>>> commit e7ec014a47e4 ("Input: twl6040-vibra - update for device tree support")
> >>>>>
> >>>>> made the separate vibra DT node to a subnode of the twl6040.
> >>>>>
> >>>>> It now calls of_find_node_by_name() to locate the "vibra" subnode.
> >>>>> This function has a side effect to call of_node_put on() for the twl6040
> >>>>> parent node passed in as a parameter. This causes trouble later on.
> >>>>>
> >>>>> Solution: we must call of_node_get() before of_find_node_by_name()
> >>>>
> >>>> God, what messed up API.
> >>>
> >>> Yes, indeed. It is opposite to the usual object ownership rule that the code
> >>> fragment that asks for a handle has to release it.
> >>>
> >>> Usually it does not become obvious because often CONFIG_OF_DYNAMIC=n.
> >>> This disables all of_node refcounting completely so such bugs remain unnoticed.
> >>>
> >>>> Any chance we can make it a bit more sane and
> >>>> not drop the reference inside it instead?
> >>>
> >>> Well, if you want to change ~2000 files, test on all platforms and ask Linus
> >>> for agreement?
> >>
> >> It's not that bad, let's see what DT maintainers say to the patch I
> >> posted...
> >
> > Thanks! Would make me more happy a well.
>
> Any progress on this?
I'll apply your patch for now and then will try to get mine worked in.
Thanks.
--
Dmitry
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