Bluetooth: A2MP: Create amp_mgr global list

Create amp_mgr_list global list which will be used by different
hci devices to find amp_mgr.

Signed-off-by: Andrei Emeltchenko <andrei.emeltchenko@intel.com>
Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>

2 files changed, 39 insertions, 0 deletions

diff --git a/include/net/bluetooth/a2mp.h b/include/net/bluetooth/a2mp.h
index 6a76e0a0705e..316c1c803676 100644
--- a/include/net/bluetooth/a2mp.h
+++ b/include/net/bluetooth/a2mp.h
@@ -19,12 +19,18 @@
 
 #define A2MP_FEAT_EXT   0x8000
 
+enum amp_mgr_state {
+        READ_LOC_AMP_INFO,
+};
+
 struct amp_mgr {
+        struct list_head        list;
         struct l2cap_conn       *l2cap_conn;
         struct l2cap_chan       *a2mp_chan;
         struct kref             kref;
         __u8                    ident;
         __u8                    handle;
+        enum amp_mgr_state      state;
         unsigned long           flags;
 };
 
@@ -118,9 +124,13 @@ struct a2mp_physlink_rsp {
 #define A2MP_STATUS_PHYS_LINK_EXISTS            0x05
 #define A2MP_STATUS_SECURITY_VIOLATION          0x06
 
+extern struct list_head amp_mgr_list;
+extern struct mutex amp_mgr_list_lock;
+
 void amp_mgr_get(struct amp_mgr *mgr);
 int amp_mgr_put(struct amp_mgr *mgr);
 struct l2cap_chan *a2mp_channel_create(struct l2cap_conn *conn,
                                        struct sk_buff *skb);
+struct amp_mgr *amp_mgr_lookup_by_state(u8 state);
 
 #endif /* __A2MP_H */
diff --git a/net/bluetooth/a2mp.c b/net/bluetooth/a2mp.c
index 0760d1fed6f0..3f930608ecfa 100644
--- a/net/bluetooth/a2mp.c
+++ b/net/bluetooth/a2mp.c
@@ -17,6 +17,10 @@
 #include <net/bluetooth/l2cap.h>
 #include <net/bluetooth/a2mp.h>
 
+/* Global AMP Manager list */
+LIST_HEAD(amp_mgr_list);
+DEFINE_MUTEX(amp_mgr_list_lock);
+
 /* A2MP build & send command helper functions */
 static struct a2mp_cmd *__a2mp_build(u8 code, u8 ident, u16 len, void *data)
 {
@@ -516,6 +520,10 @@ static void amp_mgr_destroy(struct kref *kref)
 
         BT_DBG("mgr %p", mgr);
 
+        mutex_lock(&amp_mgr_list_lock);
+        list_del(&mgr->list);
+        mutex_unlock(&amp_mgr_list_lock);
+
         kfree(mgr);
 }
 
@@ -552,6 +560,10 @@ static struct amp_mgr *amp_mgr_create(struct l2cap_conn *conn)
 
         kref_init(&mgr->kref);
 
+        mutex_lock(&amp_mgr_list_lock);
+        list_add(&mgr->list, &amp_mgr_list);
+        mutex_unlock(&amp_mgr_list_lock);
+
         return mgr;
 }
 
@@ -570,3 +582,20 @@ struct l2cap_chan *a2mp_channel_create(struct l2cap_conn *conn,
 
         return mgr->a2mp_chan;
 }
+
+struct amp_mgr *amp_mgr_lookup_by_state(u8 state)
+{
+        struct amp_mgr *mgr;
+
+        mutex_lock(&amp_mgr_list_lock);
+        list_for_each_entry(mgr, &amp_mgr_list, list) {
+                if (mgr->state == state) {
+                        amp_mgr_get(mgr);
+                        mutex_unlock(&amp_mgr_list_lock);
+                        return mgr;
+                }
+        }
+        mutex_unlock(&amp_mgr_list_lock);
+
+        return NULL;
+}