Merge tag 'edac_for_4.10' of git://git.kernel.org/pub/scm/linux/kernel/git/bp/bp

Pull EDAC updates from Borislav Petkov:

 - add KNM support to sb_edac (Piotr Luc)

 - add AMD Zen support to amd64_edac (Yazen Ghannam)

 - misc small cleanups, improvements and fixes (Colin Ian King, Dave
   Hansen, Pan Bian, Thor Thayer, Wei Yongjun, Yanjiang Jin, yours
   truly)

* tag 'edac_for_4.10' of git://git.kernel.org/pub/scm/linux/kernel/git/bp/bp: (26 commits)
  EDAC, amd64: Fix improper return value
  EDAC, amd64: Improve amd64-specific printing macros
  EDAC, amd64: Autoload amd64_edac_mod on Fam17h systems
  EDAC, amd64: Define and register UMC error decode function
  EDAC, amd64: Determine EDAC capabilities on Fam17h systems
  EDAC, amd64: Determine EDAC MC capabilities on Fam17h
  EDAC, amd64: Add Fam17h debug output
  EDAC, amd64: Add Fam17h scrubber support
  EDAC, mce_amd: Don't report poison bit on Fam15h, bank 4
  EDAC, amd64: Read MC registers on AMD Fam17h
  EDAC, amd64: Reserve correct PCI devices on AMD Fam17h
  EDAC, amd64: Add AMD Fam17h family type and ops
  EDAC, amd64: Extend ecc_enabled() to Fam17h
  EDAC, amd64: Don't force-enable ECC checking on newer systems
  EDAC, amd64: Add Deferred Error type
  EDAC, amd64: Rename __log_bus_error() to be more specific
  EDAC, amd64: Change target of pci_name from F2 to F3
  EDAC, mce_amd: Rename nb_bus_decoder to dram_ecc_decoder
  EDAC: Add LRDDR4 DRAM type
  EDAC, mpc85xx: Implement remove method for the platform driver
  ...

1 files changed, 31 insertions, 18 deletions

diff --git a/drivers/edac/edac_mc.c b/drivers/edac/edac_mc.c
index c3ee3ad98a63..d2ea9c4f1824 100644
--- a/drivers/edac/edac_mc.c
+++ b/drivers/edac/edac_mc.c
@@ -482,15 +482,8 @@ void edac_mc_free(struct mem_ctl_info *mci)
 }
 EXPORT_SYMBOL_GPL(edac_mc_free);
 
-
-/**
- * find_mci_by_dev
- *
- *	scan list of controllers looking for the one that manages
- *	the 'dev' device
- * @dev: pointer to a struct device related with the MCI
- */
-struct mem_ctl_info *find_mci_by_dev(struct device *dev)
+/* Caller must hold mem_ctls_mutex */
+static struct mem_ctl_info *__find_mci_by_dev(struct device *dev)
 {
 	struct mem_ctl_info *mci;
 	struct list_head *item;
@@ -506,6 +499,24 @@ struct mem_ctl_info *find_mci_by_dev(struct device *dev)
 
 	return NULL;
 }
+
+/**
+ * find_mci_by_dev
+ *
+ *	scan list of controllers looking for the one that manages
+ *	the 'dev' device
+ * @dev: pointer to a struct device related with the MCI
+ */
+struct mem_ctl_info *find_mci_by_dev(struct device *dev)
+{
+	struct mem_ctl_info *ret;
+
+	mutex_lock(&mem_ctls_mutex);
+	ret = __find_mci_by_dev(dev);
+	mutex_unlock(&mem_ctls_mutex);
+
+	return ret;
+}
 EXPORT_SYMBOL_GPL(find_mci_by_dev);
 
 /*
@@ -588,7 +599,7 @@ static int add_mc_to_global_list(struct mem_ctl_info *mci)
 
 	insert_before = &mc_devices;
 
-	p = find_mci_by_dev(mci->pdev);
+	p = __find_mci_by_dev(mci->pdev);
 	if (unlikely(p != NULL))
 		goto fail0;
 
@@ -640,26 +651,28 @@ static int del_mc_from_global_list(struct mem_ctl_info *mci)
  *
  * 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 mem_ctl_info *mci = NULL;
 	struct list_head *item;
-	struct mem_ctl_info *mci;
+
+	mutex_lock(&mem_ctls_mutex);
 
 	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;
-
+			if (mci->mc_idx == idx) {
+				goto unlock;
+			}
 			break;
 		}
 	}
 
-	return NULL;
+unlock:
+	mutex_unlock(&mem_ctls_mutex);
+	return mci;
 }
 EXPORT_SYMBOL(edac_mc_find);
 
@@ -779,7 +792,7 @@ struct mem_ctl_info *edac_mc_del_mc(struct device *dev)
 	mutex_lock(&mem_ctls_mutex);
 
 	/* find the requested mci struct in the global list */
-	mci = find_mci_by_dev(dev);
+	mci = __find_mci_by_dev(dev);
 	if (mci == NULL) {
 		mutex_unlock(&mem_ctls_mutex);
 		return NULL;