From d7fc9d77acb8651e5fcb77df71dfd11fcf1f08ba Mon Sep 17 00:00:00 2001
From: Yazen Ghannam <Yazen.Ghannam@amd.com>
Date: Fri, 27 Jan 2017 11:24:21 -0600
Subject: [PATCH] EDAC: Add routine to check if MC devices list is empty
We need to know if any MC devices have been allocated.
Signed-off-by: Yazen Ghannam <Yazen.Ghannam@amd.com>
Cc: linux-edac <linux-edac@vger.kernel.org>
Link: http://lkml.kernel.org/r/1485537863-2707-7-git-send-email-Yazen.Ghannam@amd.com
[ Prettify text. ]
Signed-off-by: Borislav Petkov <bp@suse.de>
---
drivers/edac/edac_mc.c | 14 ++++++++++++++
drivers/edac/edac_mc.h | 9 +++++++++
2 files changed, 23 insertions(+)
diff --git a/drivers/edac/edac_mc.c b/drivers/edac/edac_mc.c
index 750891ea07de1..e5573c56b15e0 100644
--- a/drivers/edac/edac_mc.c
+++ b/drivers/edac/edac_mc.c
@@ -453,6 +453,20 @@ void edac_mc_free(struct mem_ctl_info *mci)
}
EXPORT_SYMBOL_GPL(edac_mc_free);
+bool edac_has_mcs(void)
+{
+ bool ret;
+
+ mutex_lock(&mem_ctls_mutex);
+
+ ret = list_empty(&mc_devices);
+
+ mutex_unlock(&mem_ctls_mutex);
+
+ return !ret;
+}
+EXPORT_SYMBOL_GPL(edac_has_mcs);
+
/* Caller must hold mem_ctls_mutex */
static struct mem_ctl_info *__find_mci_by_dev(struct device *dev)
{
diff --git a/drivers/edac/edac_mc.h b/drivers/edac/edac_mc.h
index 50fc1dc9c0d83..5357800e418d3 100644
--- a/drivers/edac/edac_mc.h
+++ b/drivers/edac/edac_mc.h
@@ -148,6 +148,15 @@ extern int edac_mc_add_mc_with_groups(struct mem_ctl_info *mci,
*/
extern void edac_mc_free(struct mem_ctl_info *mci);
+/**
+ * edac_has_mcs() - Check if any MCs have been allocated.
+ *
+ * Returns:
+ * True if MC instances have been registered successfully.
+ * False otherwise.
+ */
+extern bool edac_has_mcs(void);
+
/**
* edac_mc_find() - Search for a mem_ctl_info structure whose index is @idx.
*
--
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