Re: [PATCH 4/7] phy: rockchip-usb: add missing of_node_put

From: Brian Norris
Date: Wed Nov 18 2015 - 14:31:38 EST

On Wed, Nov 18, 2015 at 08:27:07PM +0100, Heiko Stübner wrote:
> Am Montag, 16. November 2015, 12:33:17 schrieb Julia Lawall:
> hmm, while I agree that the rockchip phy has an issue in the node lifecycle,
> I'm not sure that patch fixes it fully.
> It currently iterates over each phy, but would only of_node_put the phy it
> handled last. So if an error happens on the 3rd phy, the first 2 are already
> instantiated and would also get removed when the overall probe fails, but
> their of_node would never be "put".

Note the behavior of of_get_next_child() (and
of_get_next_available_child()); it "Decrements the refcount of prev." So
the loop only keeps a reference for (at most) one node at a time.

I believe Julia's patch is correct. It's possible the commit description
could have made this aspect clearer though, since I was confused about
this at first as well.

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