Only add presence watching when all OCCs are bound

The OCC present count returns the number of OCCs in the system. Before
we have bound the second OCC, this will be greater than the number of
OCCs the Manager has counted as Active, resulting in a mismatch, causing
an error.

Resolves openbmc/openbmc#2733

Change-Id: Ia37a6b152fb073cf3044c601501903bcdfe9d3fe
Signed-off-by: Eddie James <eajames@us.ibm.com>

3 files changed, 24 insertions, 5 deletions

diff --git a/occ_device.hpp b/occ_device.hpp
index fd30641..2ca94f5 100644
--- a/occ_device.hpp
+++ b/occ_device.hpp
@@ -105,11 +105,6 @@ class Device
         /** @brief Starts to monitor for errors */
         inline void addErrorWatch()
         {
-            if (master())
-            {
-                presence.addWatch();
-            }
-
             throttleProcTemp.addWatch();
             throttleProcPower.addWatch();
             throttleMemTemp.addWatch();
@@ -128,6 +123,15 @@ class Device
             throttleProcTemp.removeWatch();
         }
 
+        /** @brief Starts to watch how many OCCs are present on the master */
+        inline void addPresenceWatchMaster()
+        {
+            if (master())
+            {
+                presence.addWatch();
+            }
+        }
+
     private:
         /** @brief Config value to be used to do bind and unbind */
         const std::string config;
diff --git a/occ_manager.cpp b/occ_manager.cpp
index 040676b..6fd0652 100644
--- a/occ_manager.cpp
+++ b/occ_manager.cpp
@@ -82,6 +82,15 @@ void Manager::statusCallBack(bool status)
     }
 
     activeCount += status ? 1 : -1;
+
+    // Only start presence detection if all the OCCs are bound
+    if (activeCount == statusObjects.size())
+    {
+        for (auto &obj : statusObjects)
+        {
+            obj->addPresenceWatchMaster();
+        }
+    }
 }
 
 #ifdef I2C_OCC
diff --git a/occ_status.hpp b/occ_status.hpp
index 60134fb..d88ef6b 100644
--- a/occ_status.hpp
+++ b/occ_status.hpp
@@ -120,6 +120,12 @@ class Status : public Interface
             return device.removeErrorWatch();
         }
 
+        /** @brief Starts to watch how many OCCs are present on the master */
+        inline void addPresenceWatchMaster()
+        {
+            return device.addPresenceWatchMaster();
+        }
+
     private:
 
         /** @brief sdbus handle */