[U-Boot] [PATCH] fdt: fix fdtdec_get_addr_size not to require any size cells

[Simon Glass]

On 29 September 2015 at 05:33, Simon Glass <sjg at chromium.org> wrote:
> On 28 September 2015 at 04:41, Przemyslaw Marczak <p.marczak at samsung.com> wrote:
>> Hello Stephen,
>>
>>
>> On 09/25/2015 06:11 PM, Stephen Warren wrote:
>>>
>>> From: Stephen Warren <swarren at nvidia.com>
>>>
>>> fdtdec_get_addr_size() may be used in two cases:
>>> a) With sizep supplied, in which case both an address and a size are
>>> parsed from DT. In this case, the DT property must be large enough to
>>> contain both values.
>>> b) With sizep NULL, in which case only an address is parsed from DT.
>>> In this case, the DT property only need be large enough to contain this
>>> address value. Commit 02464e386bb5 "fdt: add new fdt address parsing
>>> functions" broke this relaxed checking, and required the DT property to
>>> contain both an address and a size value in all cases.
>>>
>>> Fix fdtdec_get_addr_size() to vary ns based on whether the size value
>>> is being parsed from the DT or not. This is safe since the function only
>>> parses the first entry in the property, so the overall value of (na + ns)
>>> need not be accurate, since it is never used to step through the property
>>> data to find other entries. Besides, this fixed behaviour essentially
>>> matches the original behaviour before the patch this patch fixes. (The
>>> original code validated that the property was exactly the length of
>>> either na or (na + ns), whereas the current code only validates that the
>>> property is at least that long. For non-failure cases, the two behaviours
>>> are identical).
>>>
>>> Cc: Przemyslaw Marczak <p.marczak at samsung.com>
>>> Cc: Simon Glass <sjg at chromium.org>
>>> Cc: Thierry Reding <treding at nvidia.com>
>>> Cc: Bin Meng <bmeng.cn at gmail.com>
>>> Cc: Michal Suchanek <hramrach at gmail.com>
>>> Fixes: 02464e386bb5 ("fdt: add new fdt address parsing functions")
>>> Reported-by: Przemyslaw Marczak <p.marczak at samsung.com>
>>> Signed-off-by: Stephen Warren <swarren at nvidia.com>
>>> ---
>>>   lib/fdtdec.c | 5 +++--
>>>   1 file changed, 3 insertions(+), 2 deletions(-)
>
> Acked-by: Simon Glass <sjg at chromium.org>

Applied to u-boot-fdt, thanks!