Re: [RFC PATCH] OF: fix of_find_node_by_path() assumption that of_allnodes is root

[Frank Rowand <frowand.list-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

From: Frank Rowand <frank.rowand-/MT0OVThwyLZJqsBc5GL+g@public.gmane.org>

of_find_node_by_path() is borked because of_allnodes is not guaranteed to
contain the root of the tree after using any of the dynamic update functions
because some other nodes ends up as of_allnodes.

Fixes: c22e650e66b8 of: Make of_find_node_by_path() handle /aliases
Reported-by: pantelis.antoniou-OWPKS81ov/FWk0Htik3J/w@public.gmane.org
Signed-off-by: Frank Rowand <frank.rowand-/MT0OVThwyLZJqsBc5GL+g@public.gmane.org>
---

v2:
  Remove change to function header, no longer needed.
  Remove BUG_ON(), no longer needed.
  Add np as np->parent->allnext instead of np->parent->allnext, as suggested
    by Grant Likely.


 drivers/of/base.c |    4 	2 +	2 -	0 !
 1 file changed, 2 insertions(+), 2 deletions(-)

Index: b/drivers/of/base.c
===================================================================
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -1960,9 +1960,9 @@ int of_attach_node(struct device_node *n
 
 	raw_spin_lock_irqsave(&devtree_lock, flags);
 	np->sibling = np->parent->child;
-	np->allnext = of_allnodes;
+	np->allnext = np->parent->allnext;
+	np->parent->allnext = np;
 	np->parent->child = np;
-	of_allnodes = np;
 	of_node_clear_flag(np, OF_DETACHED);
 	raw_spin_unlock_irqrestore(&devtree_lock, flags);
 
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