[PATCH] EDAC: mc numbers refactor 1-of-2
[linux-2.6.git] / drivers / edac / edac_mc.c
index 603de8b..357c95f 100644 (file)
@@ -1632,47 +1632,46 @@ static struct mem_ctl_info *find_mci_by_dev(struct device *dev)
        return NULL;
 }
 
-static int add_mc_to_global_list(struct mem_ctl_info *mci)
+/* Return 0 on success, 1 on failure.
+ * Before calling this function, caller must
+ * assign a unique value to mci->mc_idx.
+ */
+static int add_mc_to_global_list (struct mem_ctl_info *mci)
 {
        struct list_head *item, *insert_before;
        struct mem_ctl_info *p;
-       int i;
 
-       if (list_empty(&mc_devices)) {
-               mci->mc_idx = 0;
-               insert_before = &mc_devices;
-       } else {
-               if (find_mci_by_dev(mci->dev)) {
-                       edac_printk(KERN_WARNING, EDAC_MC,
-                               "%s (%s) %s %s already assigned %d\n",
-                               mci->dev->bus_id, dev_name(mci->dev),
-                               mci->mod_name, mci->ctl_name,
-                               mci->mc_idx);
-                       return 1;
-               }
+       insert_before = &mc_devices;
 
-               insert_before = NULL;
-               i = 0;
+       if (unlikely((p = find_mci_by_dev(mci->dev)) != NULL))
+               goto fail0;
 
-               list_for_each(item, &mc_devices) {
-                       p = list_entry(item, struct mem_ctl_info, link);
+       list_for_each(item, &mc_devices) {
+               p = list_entry(item, struct mem_ctl_info, link);
 
-                       if (p->mc_idx != i) {
-                               insert_before = item;
-                               break;
-                       }
+               if (p->mc_idx >= mci->mc_idx) {
+                       if (unlikely(p->mc_idx == mci->mc_idx))
+                               goto fail1;
 
-                       i++;
+                       insert_before = item;
+                       break;
                }
-
-               mci->mc_idx = i;
-
-               if (insert_before == NULL)
-                       insert_before = &mc_devices;
        }
 
        list_add_tail_rcu(&mci->link, insert_before);
        return 0;
+
+fail0:
+       edac_printk(KERN_WARNING, EDAC_MC,
+                   "%s (%s) %s %s already assigned %d\n", p->dev->bus_id,
+                   dev_name(p->dev), p->mod_name, p->ctl_name, p->mc_idx);
+       return 1;
+
+fail1:
+       edac_printk(KERN_WARNING, EDAC_MC,
+                   "bug in low-level driver: attempt to assign\n"
+                   "    duplicate mc_idx %d in %s()\n", p->mc_idx, __func__);
+       return 1;
 }
 
 static void complete_mc_list_del(struct rcu_head *head)
@@ -1696,6 +1695,7 @@ static void del_mc_from_global_list(struct mem_ctl_info *mci)
  * edac_mc_add_mc: Insert the 'mci' structure into the mci global list and
  *                 create sysfs entries associated with mci structure
  * @mci: pointer to the mci structure to be added to the list
+ * @mc_idx: A unique numeric identifier to be assigned to the 'mci' structure.
  *
  * Return:
  *     0       Success
@@ -1703,9 +1703,10 @@ static void del_mc_from_global_list(struct mem_ctl_info *mci)
  */
 
 /* FIXME - should a warning be printed if no error detection? correction? */
-int edac_mc_add_mc(struct mem_ctl_info *mci)
+int edac_mc_add_mc(struct mem_ctl_info *mci, int mc_idx)
 {
        debugf0("%s()\n", __func__);
+       mci->mc_idx = mc_idx;
 #ifdef CONFIG_EDAC_DEBUG
        if (edac_debug_level >= 3)
                edac_mc_dump_mci(mci);