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[POWERPC] ibmebus: Prevent bus_id collisions

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Previously, ibmebus derived a device's bus_id from its location code.
The location code is not guaranteed to be unique, so we might get bus_id
collisions if two devices share the same location code.  The OFDT
full_name, however, is unique, so we use that instead (truncating it
on the left if it is too long).

Signed-off-by: Joachim Fenkes <fenkes@de.ibm.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Joachim Fenkes 2007-08-29 18:15:17 +02:00 committed by Paul Mackerras
parent d51dd3de87
commit d8612417b2
1 changed files with 9 additions and 21 deletions
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30
arch/powerpc/kernel/ibmebus.c
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@ -188,33 +188,21 @@ static struct ibmebus_dev* __devinit ibmebus_register_device_node(
struct device_node *dn)
{
struct ibmebus_dev *dev;
const char *loc_code;
int length;
loc_code = of_get_property(dn, "ibm,loc-code", NULL);
if (!loc_code) {
printk(KERN_WARNING "%s: node %s missing 'ibm,loc-code'\n",
__FUNCTION__, dn->name ? dn->name : "<unknown>");
return ERR_PTR(-EINVAL);
}
if (strlen(loc_code) == 0) {
printk(KERN_WARNING "%s: 'ibm,loc-code' is invalid\n",
__FUNCTION__);
return ERR_PTR(-EINVAL);
}
int i, len, bus_len;
dev = kzalloc(sizeof(struct ibmebus_dev), GFP_KERNEL);
if (!dev) {
if (!dev)
return ERR_PTR(-ENOMEM);
}
dev->ofdev.node = of_node_get(dn);
length = strlen(loc_code);
memcpy(dev->ofdev.dev.bus_id, loc_code
+ (length - min(length, BUS_ID_SIZE - 1)),
min(length, BUS_ID_SIZE - 1));
len = strlen(dn->full_name + 1);
bus_len = min(len, BUS_ID_SIZE - 1);
memcpy(dev->ofdev.dev.bus_id, dn->full_name + 1
+ (len - bus_len), bus_len);
for (i = 0; i < bus_len; i++)
if (dev->ofdev.dev.bus_id[i] == '/')
dev->ofdev.dev.bus_id[i] = '_';
/* Register with generic device framework. */
if (ibmebus_register_device_common(dev, dn->name) != 0) {