edac: add edac_device_alloc_index()

Add edac_device_alloc_index(), because for MAPLE platform there may
exist several EDAC driver modules that could make use of
edac_device_ctl_info structure at the same time. The index allocation
for these structures should be taken care of by EDAC core.

[akpm@linux-foundation.org: cleanups]
Signed-off-by: Harry Ciao <qingtao.cao@windriver.com>
Cc: Doug Thompson <norsk5@yahoo.com>
Cc: Michael Ellerman <michael@ellerman.id.au>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Kumar Gala <galak@gate.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

3 files changed, 16 insertions, 2 deletions

diff --git a/drivers/edac/amd8111_edac.c b/drivers/edac/amd8111_edac.c
index 2cb58ef743e0..35b78d04bbfa 100644
--- a/drivers/edac/amd8111_edac.c
+++ b/drivers/edac/amd8111_edac.c
@@ -37,7 +37,6 @@
 #define AMD8111_EDAC_MOD_STR    "amd8111_edac"
 
 #define PCI_DEVICE_ID_AMD_8111_PCI      0x7460
-static int edac_dev_idx;
 
 enum amd8111_edac_devs {
         LPC_BRIDGE = 0,
@@ -377,7 +376,7 @@ static int amd8111_dev_probe(struct pci_dev *dev,
          * edac_device_ctl_info, but make use of existing
          * one instead.
         */
-        dev_info->edac_idx = edac_dev_idx++;
+        dev_info->edac_idx = edac_device_alloc_index();
         dev_info->edac_dev =
                 edac_device_alloc_ctl_info(0, dev_info->ctl_name, 1,
                                            NULL, 0, 0,
diff --git a/drivers/edac/edac_core.h b/drivers/edac/edac_core.h
index 48d3b1409834..3493c6bdb820 100644
--- a/drivers/edac/edac_core.h
+++ b/drivers/edac/edac_core.h
@@ -841,6 +841,7 @@ extern void edac_device_handle_ue(struct edac_device_ctl_info *edac_dev,
                                 int inst_nr, int block_nr, const char *msg);
 extern void edac_device_handle_ce(struct edac_device_ctl_info *edac_dev,
                                 int inst_nr, int block_nr, const char *msg);
+extern int edac_device_alloc_index(void);
 
 /*
  * edac_pci APIs
diff --git a/drivers/edac/edac_device.c b/drivers/edac/edac_device.c
index a7d2c717d033..b02a6a69a8f0 100644
--- a/drivers/edac/edac_device.c
+++ b/drivers/edac/edac_device.c
@@ -490,6 +490,20 @@ void edac_device_reset_delay_period(struct edac_device_ctl_info *edac_dev,
         mutex_unlock(&device_ctls_mutex);
 }
 
+/*
+ * edac_device_alloc_index: Allocate a unique device index number
+ *
+ * Return:
+ *      allocated index number
+ */
+int edac_device_alloc_index(void)
+{
+        static atomic_t device_indexes = ATOMIC_INIT(0);
+
+        return atomic_inc_return(&device_indexes) - 1;
+}
+EXPORT_SYMBOL_GPL(edac_device_alloc_index);
+
 /**
  * edac_device_add_device: Insert the 'edac_dev' structure into the
  * edac_device global list and create sysfs entries associated with