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[POWERPC] spu_manage: fix spu_unit_number for celleb device tree 

This fixes a regression introduced with 2.6.23-rc4 after on some
confusion about the device tree interfaces.

IBM QS21 device trees provide "physical-id", so we changed the code to
run on that and remain compatible with all IBM machines.

However, the Toshiba Celleb device tree provides the "unit-id" property,
which was in the Linux code, but never used in this way on IBM hardware.

Legacy device tree used the reg property for the physical id of an spe.
This patch fixes find_spu_unit_number to look for the spu id in that order.
The length is checked to avoid misinterpretation in case the attributes
unit-id or reg do not contain the id.

Signed-off-by: Christian Krafft <krafft@de.ibm.com>
Signed-off-by: Arnd Bergmann <arnd.bergmann@de.ibm.com>
Cc: Jeremy Kerr <jk@ozlabs.org>
This commit is contained in:
Christian Krafft 2007-08-30 01:33:53 +02:00 committed by Arnd Bergmann
parent 5cc44e086d
commit aac2e68481
1 changed files with 8 additions and 0 deletions
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8
arch/powerpc/platforms/cell/spu_manage.c
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@ -48,10 +48,18 @@ static u64 __init find_spu_unit_number(struct device_node *spe)
{
const unsigned int *prop;
int proplen;
/* new device trees should provide the physical-id attribute */
prop = of_get_property(spe, "physical-id", &proplen);
if (proplen == 4)
return (u64)*prop;
/* celleb device tree provides the unit-id */
prop = of_get_property(spe, "unit-id", &proplen);
if (proplen == 4)
return (u64)*prop;
/* legacy device trees provide the id in the reg attribute */
prop = of_get_property(spe, "reg", &proplen);
if (proplen == 4)
return (u64)*prop;