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[POWERPC] Check for the root node in of_detach_node()

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It's not sensible to call of_detach_node() on the root node,
but we should check for it just to be safe.

Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Michael Ellerman 2007-06-19 16:07:56 +10:00 committed by Paul Mackerras
parent 333e615483
commit 972d17c9db
1 changed files with 3 additions and 0 deletions
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3
arch/powerpc/kernel/prom.c
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@ -1432,6 +1432,8 @@ void of_detach_node(const struct device_node *np)
write_lock(&devtree_lock); write_lock(&devtree_lock);
parent = np->parent; parent = np->parent;
if (!parent)
goto out_unlock;
if (allnodes == np) if (allnodes == np)
allnodes = np->allnext; allnodes = np->allnext;
@ -1455,6 +1457,7 @@ void of_detach_node(const struct device_node *np)
prevsib->sibling = np->sibling; prevsib->sibling = np->sibling;
} }
out_unlock:
write_unlock(&devtree_lock); write_unlock(&devtree_lock);
} }