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>

diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
index 406757a..dee4fb5 100644 (file)
--- 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) {