On 08/15/2013 12:23 AM, Tyrel Datwyler wrote:
> On the first call to ibm,update-properties for a node the first property
> returned is the full node path. Currently this is not parsed correctly by the
> update_dt_node function. Commit 2e9b7b0 attempted to fix this, but was
> incorrect as it made a wrong assumption about the layout of the first
> property in the work area. Further, if ibm,update-properties must be called
> multiple times for the same node this special property should only be skipped
> after the initial call. The first property descriptor returned consists of
> the property name, property value length, and property value. The property
> name is an empty string, property length is encoded in 4 byte integer, and
> the property value is the node path.
>
> Signed-off-by: Tyrel Datwyler <tyr...@linux.vnet.ibm.com>
Acked-by: Nathan Fontenot <nf...@linux.vnet.ibm.com>
> ---
> arch/powerpc/platforms/pseries/mobility.c | 21 +++++++++++----------
> 1 file changed, 11 insertions(+), 10 deletions(-)
>
> diff --git a/arch/powerpc/platforms/pseries/mobility.c
> b/arch/powerpc/platforms/pseries/mobility.c
> index 023e354..ed5426f 100644
> --- a/arch/powerpc/platforms/pseries/mobility.c
> +++ b/arch/powerpc/platforms/pseries/mobility.c
> @@ -161,18 +161,19 @@ static int update_dt_node(u32 phandle, s32 scope)
>
> prop_data = rtas_buf + sizeof(*upwa);
>
> - /* The first element of the buffer is the path of the node
> - * being updated in the form of a 8 byte string length
> - * followed by the string. Skip past this to get to the
> - * properties being updated.
> + /* On the first call to ibm,update-properties for a node the
> + * the first property value descriptor contains an empty
> + * property name, the property value length encoded as u32,
> + * and the property value is the node path being updated.
> */
> - vd = *prop_data++;
> - prop_data += vd;
> + if (*prop_data == 0) {
> + prop_data++;
> + vd = *(u32 *)prop_data;
> + prop_data += vd + sizeof(vd);
> + upwa->nprops--;
> + }
>
> - /* The path we skipped over is counted as one of the elements
> - * returned so start counting at one.
> - */
> - for (i = 1; i < upwa->nprops; i++) {
> + for (i = 0; i < upwa->nprops; i++) {
> char *prop_name;
>
> prop_name = prop_data;
>
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