of/flattree: Fix unhandled OF_DT_NOP tag when unflattening the device tree

NOPs within the property section are skipped, but NOPs between
OF_DT_END_NODE and OF_DT_BEGIN_NODE were not. My firmware NOPs out
entire nodes depending on various environment parameters.

of_scan_flat_dt already handles NOP more generally.

Signed-off-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>

1 files changed, 5 insertions, 2 deletions

diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
index 406757a9d7ea..dee4fb56b094 100644
--- a/drivers/of/fdt.c
+++ b/drivers/of/fdt.c
@@ -376,8 +376,11 @@ unsigned long __init unflatten_dt_node(unsigned long mem,
                 if (!np->type)
                         np->type = "<NULL>";
         }
-        while (tag == OF_DT_BEGIN_NODE) {
-                mem = unflatten_dt_node(mem, p, np, allnextpp, fpsize);
+        while (tag == OF_DT_BEGIN_NODE || tag == OF_DT_NOP) {
+                if (tag == OF_DT_NOP)
+                        *p += 4;
+                else
+                        mem = unflatten_dt_node(mem, p, np, allnextpp, fpsize);
                 tag = be32_to_cpup((__be32 *)(*p));
         }
         if (tag != OF_DT_END_NODE) {