From: Joachim Fenkes <fenkes@de.ibm.com>
Date: Wed, 29 Aug 2007 16:15:17 +0000 (+0200)
Subject: [POWERPC] ibmebus: Prevent bus_id collisions
X-Git-Tag: v2.6.23-rc6~18
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d8612417b2f78767b96ca434b50d23e5cdfcde07;p=linux-2.6

[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>
---

diff --git a/arch/powerpc/kernel/ibmebus.c b/arch/powerpc/kernel/ibmebus.c
index 9a8c9af43b..d6a38cd501 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) {