[POWERPC] Add a warning to help trackdown device_node refcounting bugs

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When the refcount for a device node goes to 0, we call the
destructor - of_node_release(). This should only happen if we've
already detached the node from the device tree.

So add a flag OF_DETACHED which tracks detached-ness, and if we
find ourselves in of_node_release() without it set, issue a
warning and don't free the device_node. To avoid warning
continuously reinitialise the kref to a sane value.

Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>

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Michael Ellerman 2007-06-19 16:08:00 +10:00 • committed by Paul Mackerras

parent d3b814bb1e

commit 6a281856c0

2 changed files with 12 additions and 0 deletions

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11

arch/powerpc/kernel/prom.c

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1

include/asm-powerpc/prom.h

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