Messages in this thread Patch in this message | | | From | Geert Uytterhoeven <> | Subject | [PATCH v2] powerpc/pmac: Fix DT refcount imbalance in pmac_pic_probe_oldstyle | Date | Tue, 3 Mar 2015 11:02:15 +0100 |
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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> --- Compile-tested only
v2: - Avoid a logic change by adding a call to of_node_get() instead of replacing of_find_node_by_name() by of_get_child_by_name(). No-one seems to remember which machines are affected by this. --- arch/powerpc/platforms/powermac/pic.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/arch/powerpc/platforms/powermac/pic.c b/arch/powerpc/platforms/powermac/pic.c index 4c24bf60d39d2834..59cfc9d63c2d51a7 100644 --- a/arch/powerpc/platforms/powermac/pic.c +++ b/arch/powerpc/platforms/powermac/pic.c @@ -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 */ -- 1.9.1
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