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fdt: Add a function to remove unused strings from a device tree

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Property names are stored in a string table. When a node property is
removed, the string table is not updated since other nodes may have a
property with the same name.

Thus it is possible for the string table to build up a number of unused
strings. Add a function to remove these. This works by building a new device
tree from the old one, adding strings one by one as needed.

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass
2015-06-23 15:38:26 -06:00
parent 5b9d44df23
commit 8f6e2e1ee1
2 changed files with 49 additions and 0 deletions
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32
lib/libfdt/fdt_rw.c
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@@ -449,3 +449,35 @@ int fdt_pack(void *fdt)
return 0;
}
int fdt_remove_unused_strings(const void *old, void *new)
{
const struct fdt_property *old_prop;
struct fdt_property *new_prop;
int size = fdt_totalsize(old);
int next_offset, offset;
const char *str;
int ret;
int tag = FDT_PROP;
/* Make a copy and remove the strings */
memcpy(new, old, size);
fdt_set_size_dt_strings(new, 0);
/* Add every property name back into the new string table */
for (offset = 0; tag != FDT_END; offset = next_offset) {
tag = fdt_next_tag(old, offset, &next_offset);
if (tag != FDT_PROP)
continue;
old_prop = fdt_get_property_by_offset(old, offset, NULL);
new_prop = (struct fdt_property *)(unsigned long)
fdt_get_property_by_offset(new, offset, NULL);
str = fdt_string(old, fdt32_to_cpu(old_prop->nameoff));
ret = _fdt_find_add_string(new, str);
if (ret < 0)
return ret;
new_prop->nameoff = cpu_to_fdt32(ret);
}
return 0;
}