[PATCH 2/36] drivers edac add edac_mc_find API

[Doug Thompson <norsk5@yahoo.com>]

From:	Douglas Thompson <dougthompson@xmission.com>

This simple patch adds an important CORE API for EDAC that
EDAC drivers can use to find their edac_mc control structure by passing
a mem_ctl_info 'instance' value

Needed for subsequent patches

Signed-off-by:  Douglas Thompson <dougthompson@xmission.com>
--
 edac_mc.c |   28 ++++++++++++++++++++++++++++
 edac_mc.h |    1 +
 2 files changed, 29 insertions(+)
--
diff -puN
drivers/edac/edac_mc.c~edac-new-opteron-athlon64-memory-controller-driver
drivers/edac/edac_mc.c
---
a/drivers/edac/edac_mc.c~edac-new-opteron-athlon64-memory-controller-driver
+++ a/drivers/edac/edac_mc.c
@@ -1457,6 +1457,34 @@ static void del_mc_from_global_list(stru
 }
 
 /**
+ * edac_mc_find: Search for a mem_ctl_info structure whose index is
'idx'.
+ *
+ * If found, return a pointer to the structure.
+ * Else return NULL.
+ *
+ * Caller must hold mem_ctls_mutex.
+ */
+struct mem_ctl_info * edac_mc_find(int idx)
+{
+	struct list_head *item;
+	struct mem_ctl_info *mci;
+
+	list_for_each(item, &mc_devices) {
+		mci = list_entry(item, struct mem_ctl_info, link);
+
+		if (mci->mc_idx >= idx) {
+			if (mci->mc_idx == idx)
+				return mci;
+
+			break;
+		}
+	}
+
+	return NULL;
+}
+EXPORT_SYMBOL(edac_mc_find);
+
+/**
  * 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
diff -puN
drivers/edac/edac_mc.h~edac-new-opteron-athlon64-memory-controller-driver
drivers/edac/edac_mc.h
---
a/drivers/edac/edac_mc.h~edac-new-opteron-athlon64-memory-controller-driver
+++ a/drivers/edac/edac_mc.h
@@ -430,6 +430,7 @@ void edac_mc_dump_mci(struct mem_ctl_inf
 void edac_mc_dump_csrow(struct csrow_info *csrow);
 #endif  /* CONFIG_EDAC_DEBUG */
 
+extern struct mem_ctl_info * edac_mc_find(int idx);
 extern int edac_mc_add_mc(struct mem_ctl_info *mci,int mc_idx);
 extern struct mem_ctl_info * edac_mc_del_mc(struct device *dev);
 extern int edac_mc_find_csrow_by_page(struct mem_ctl_info *mci,