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powerpc/pmac: Fix DT refcount imbalance in pmac_pic_probe_oldstyle

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Internally, of_find_node_by_name() calls of_node_put() on its "from"
parameter, which must not be done on "master", as it's still in use, and
will be released manually later.  This may cause a zero kref refcount.

Call of_node_get() before to compensate for this.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Geert Uytterhoeven 2015-03-03 11:02:15 +01:00 committed by Benjamin Herrenschmidt
parent 4b7d835881
commit 8f910fd0d9
1 changed files with 3 additions and 0 deletions
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arch/powerpc/platforms/powermac/pic.c
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@ -321,6 +321,9 @@ static void __init pmac_pic_probe_oldstyle(void)
max_irqs = max_real_irqs = 64;
/* We might have a second cascaded heathrow */
/* Compensate for of_node_put() in of_find_node_by_name() */
of_node_get(master);
slave = of_find_node_by_name(master, "mac-io");
/* Check ordering of master & slave */