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libfdt: Correctly handle versions > 17

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If future dtb version > 17 are defined, that are still backwards
compatible with v16, libfdt will of course be able to read and
understand them.  However, when modifying such a tree, it can't
guarantee that it won't clobber additional structure from the new
version which it doesn't know about.  Therefore, before making
modifications to a tree of version >17, we must change it's version to
be exactly 17.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
David Gibson 2007-10-30 13:22:12 +11:00 • committed by Jon Loeliger
parent 7e14259791
commit 4a5df5c026
1 changed files with 4 additions and 1 deletions
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5
libfdt/fdt_rw.c
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@ -61,7 +61,7 @@ static int rw_check_header(void *fdt)
if ((err = fdt_check_header(fdt)))
return err;
if (fdt_version(fdt) < 0x11)
if (fdt_version(fdt) < 17)
return -FDT_ERR_BADVERSION;
if (fdt_off_mem_rsvmap(fdt) < ALIGN(sizeof(struct fdt_header), 8))
return -FDT_ERR_BADLAYOUT;
@ -74,6 +74,9 @@ static int rw_check_header(void *fdt)
if (fdt_totalsize(fdt) <
(fdt_off_dt_strings(fdt) + fdt_size_dt_strings(fdt)))
return -FDT_ERR_BADLAYOUT;
if (fdt_version(fdt) > 17)
fdt_set_version(fdt, 17);
return 0;
}