diff options
| author | Joachim Fenkes <fenkes@de.ibm.com> | 2007-08-29 18:15:17 +0200 |
|---|---|---|
| committer | Paul Mackerras <paulus@samba.org> | 2007-09-11 04:30:37 +1000 |
| commit | d8612417b2f78767b96ca434b50d23e5cdfcde07 (patch) | |
| tree | dc6231b7d51c350dfba09dc0d34251313ec286f7 /arch | |
| parent | d51dd3de87026cb0ea1ea5f873f08e930053bfc5 (diff) | |
| download | linux-d8612417b2f78767b96ca434b50d23e5cdfcde07.tar.bz2 | |
[POWERPC] ibmebus: Prevent bus_id collisions
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>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/powerpc/kernel/ibmebus.c | 30 |
1 files changed, 9 insertions, 21 deletions
diff --git a/arch/powerpc/kernel/ibmebus.c b/arch/powerpc/kernel/ibmebus.c index 9a8c9af43b22..d6a38cd5018e 100644 --- a/arch/powerpc/kernel/ibmebus.c +++ b/arch/powerpc/kernel/ibmebus.c @@ -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) { |