[v2 PATCH 4/7] EDAC: Add edac_pci_alloc_index()

[Harry Ciao <qingtao.cao@windriver.com>]

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

Signed-off-by: Harry Ciao <qingtao.cao@windriver.com>
---
 drivers/edac/edac_core.h |    1 +
 drivers/edac/edac_pci.c  |   14 ++++++++++++++
 2 files changed, 15 insertions(+), 0 deletions(-)

diff --git a/drivers/edac/edac_core.h b/drivers/edac/edac_core.h
index 4b55ec6..76cb7c2 100644
--- a/drivers/edac/edac_core.h
+++ b/drivers/edac/edac_core.h
@@ -831,6 +831,7 @@ extern void edac_pci_free_ctl_info(struct edac_pci_ctl_info *pci);
 extern void edac_pci_reset_delay_period(struct edac_pci_ctl_info *pci,
 				unsigned long value);
 
+extern int edac_pci_alloc_index(void);
 extern int edac_pci_add_device(struct edac_pci_ctl_info *pci, int edac_idx);
 extern struct edac_pci_ctl_info *edac_pci_del_device(struct device *dev);
 
diff --git a/drivers/edac/edac_pci.c b/drivers/edac/edac_pci.c
index 5d3c808..5b150ae 100644
--- a/drivers/edac/edac_pci.c
+++ b/drivers/edac/edac_pci.c
@@ -30,6 +30,7 @@
 
 static DEFINE_MUTEX(edac_pci_ctls_mutex);
 static LIST_HEAD(edac_pci_list);
+static atomic_t pci_indexes = ATOMIC_INIT(0);
 
 /*
  * edac_pci_alloc_ctl_info
@@ -318,6 +319,19 @@ void edac_pci_reset_delay_period(struct edac_pci_ctl_info *pci,
 EXPORT_SYMBOL_GPL(edac_pci_reset_delay_period);
 
 /*
+ * edac_pci_alloc_index: Allocate a unique PCI index number
+ *
+ * Return:
+ *      allocated index number
+ *
+ */
+int edac_pci_alloc_index(void)
+{
+	return atomic_inc_return(&pci_indexes) - 1;
+}
+EXPORT_SYMBOL_GPL(edac_pci_alloc_index);
+
+/*
  * edac_pci_add_device: Insert the 'edac_dev' structure into the
  * edac_pci global list and create sysfs entries associated with
  * edac_pci structure.
-- 
1.5.6.2