change(bt): Remove unused state variable for (e)SCO disconnect reason in Bluedroid

components/bt/host/bluedroid/stack/btm/btm_acl.c

@@ -335,7 +335,7 @@ void btm_acl_created (BD_ADDR bda, DEV_CLASS dc, UINT8 bdn[BTM_MAX_REM_BD_NAME_L
 #if (CLASSIC_BT_INCLUDED == TRUE)
                         const UINT8 req_pend = (p_dev_rec->sm4 & BTM_SM4_REQ_PEND);
 #endif  ///CLASSIC_BT_INCLUDED == TRUE
-                        /* Store the Peer Security Capabilites (in SM4 and rmt_sec_caps) */
+                        /* Store the Peer Security Capabilities (in SM4 and rmt_sec_caps) */
 #if (SMP_INCLUDED == TRUE)
                         btm_sec_set_peer_sec_caps(p, p_dev_rec);
 #endif  ///SMP_INCLUDED == TRUE
@@ -350,7 +350,7 @@ void btm_acl_created (BD_ADDR bda, DEV_CLASS dc, UINT8 bdn[BTM_MAX_REM_BD_NAME_L
                         return;
                     }
                 } else {
-                    /* If remote features indicated secure connection (SC) mode, check the remote feautres again*/
+                    /* If remote features indicated secure connection (SC) mode, check the remote features again*/
                     /* this is to prevent from BIAS attack where attacker can downgrade SC mode*/
                     btm_read_remote_features (p->hci_handle);
                 }
@@ -474,7 +474,7 @@ void btm_acl_removed (BD_ADDR bda, tBT_TRANSPORT transport)
                     BTM_TRACE_DEBUG("Bonded\n");
                 }
             } else {
-                BTM_TRACE_DEBUG("Bletooth link down\n");
+                BTM_TRACE_DEBUG("Bluetooth link down\n");
                 p_dev_rec->sec_flags &= ~(BTM_SEC_AUTHORIZED | BTM_SEC_AUTHENTICATED
                                           | BTM_SEC_ENCRYPTED | BTM_SEC_ROLE_SWITCHED);
             }
@@ -1016,7 +1016,7 @@ void btm_process_remote_ext_features (tACL_CONN *p_acl_cb, UINT8 num_read_pages)
 
     const UINT8 req_pend = (p_dev_rec->sm4 & BTM_SM4_REQ_PEND);
 #if (SMP_INCLUDED == TRUE)
-    /* Store the Peer Security Capabilites (in SM4 and rmt_sec_caps) */
+    /* Store the Peer Security Capabilities (in SM4 and rmt_sec_caps) */
     btm_sec_set_peer_sec_caps(p_acl_cb, p_dev_rec);
 #endif  ///SMP_INCLUDED == TRUE
     BTM_TRACE_API("%s: pend:%d\n", __FUNCTION__, req_pend);
@@ -1455,7 +1455,7 @@ void btm_process_clk_off_comp_evt (UINT16 hci_handle, UINT16 clock_offset)
 **
 ** Function         btm_acl_role_changed
 **
-** Description      This function is called whan a link's master/slave role change
+** Description      This function is called when a link's master/slave role change
 **                  event or command status event (with error) is received.
 **                  It updates the link control block, and calls
 **                  the registered callback with status and role (if registered).
@@ -2705,7 +2705,7 @@ void btm_acl_connected(BD_ADDR bda, UINT16 handle, UINT8 link_type, UINT8 enc_mo
         l2c_link_hci_conn_comp(status, handle, bda);
     }
 #if BTM_SCO_INCLUDED == TRUE
-    else {
+    else if (link_type == HCI_LINK_TYPE_SCO) {
         memset(&esco_data, 0, sizeof(tBTM_ESCO_DATA));
         esco_data.link_type = HCI_LINK_TYPE_SCO;
         memcpy (esco_data.bd_addr, bda, BD_ADDR_LEN);

components/bt/host/bluedroid/stack/btm/btm_sco.c

@@ -117,8 +117,6 @@ void btm_sco_init (void)
     }
 #endif
     /* Initialize nonzero defaults */
-    btm_cb.sco_cb.sco_disc_reason  = BTM_INVALID_SCO_DISC_REASON;
-
     btm_cb.sco_cb.def_esco_parms = btm_esco_defaults; /* Initialize with defaults */
     btm_cb.sco_cb.desired_sco_mode = BTM_DEFAULT_SCO_MODE;
 }
@@ -1048,7 +1046,6 @@ void btm_sco_connected (UINT8 hci_status, BD_ADDR bda, UINT16 hci_handle,
     tBTM_CHG_ESCO_PARAMS parms;
 #endif
 
-    btm_cb.sco_cb.sco_disc_reason = hci_status;
     BTM_TRACE_API("%s, handle %x", __FUNCTION__, hci_handle);
 #if (BTM_MAX_SCO_LINKS>0)
     for (xx = 0; xx < BTM_MAX_SCO_LINKS; xx++, p++) {
@@ -1224,16 +1221,11 @@ void btm_sco_removed (UINT16 hci_handle, UINT8 reason)
 #if (BTM_MAX_SCO_LINKS>0)
     tSCO_CONN   *p = &btm_cb.sco_cb.sco_db[0];
     UINT16      xx;
-#endif
 
-    btm_cb.sco_cb.sco_disc_reason = reason;
-
-#if (BTM_MAX_SCO_LINKS>0)
     p = &btm_cb.sco_cb.sco_db[0];
     for (xx = 0; xx < BTM_MAX_SCO_LINKS; xx++, p++) {
         if ((p->state != SCO_ST_UNUSED) && (p->state != SCO_ST_LISTENING) && (p->hci_handle == hci_handle)) {
             btm_sco_flush_sco_data(xx);
-
             p->state = SCO_ST_UNUSED;
 #if BTM_SCO_HCI_INCLUDED == TRUE
             btm_cb.sco_cb.xmit_window_size += p->sent_not_acked;
@@ -1375,24 +1367,6 @@ UINT16 BTM_ReadScoPacketTypes (UINT16 sco_inx)
 #endif
 }
 
-/*******************************************************************************
-**
-** Function         BTM_ReadScoDiscReason
-**
-** Description      This function is returns the reason why an (e)SCO connection
-**                  has been removed. It contains the value until read, or until
-**                  another (e)SCO connection has disconnected.
-**
-** Returns          HCI reason or BTM_INVALID_SCO_DISC_REASON if not set.
-**
-*******************************************************************************/
-UINT16 BTM_ReadScoDiscReason (void)
-{
-    UINT16 res = btm_cb.sco_cb.sco_disc_reason;
-    btm_cb.sco_cb.sco_disc_reason = BTM_INVALID_SCO_DISC_REASON;
-    return (res);
-}
-
 /*******************************************************************************
 **
 ** Function         BTM_ReadDeviceScoPacketTypes
@@ -1894,10 +1868,6 @@ UINT8 *BTM_ReadScoBdAddr(UINT16 sco_inx)
 {
     return ((UINT8 *) NULL);
 }
-UINT16 BTM_ReadScoDiscReason (void)
-{
-    return (BTM_INVALID_SCO_DISC_REASON);
-}
 tBTM_STATUS BTM_SetEScoMode (tBTM_SCO_TYPE sco_mode, tBTM_ESCO_PARAMS *p_parms)
 {
     return (BTM_MODE_UNSUPPORTED);

components/bt/host/bluedroid/stack/btm/include/btm_int.h

@@ -470,7 +470,6 @@ typedef struct {
     tSCO_CONN            sco_db[BTM_MAX_SCO_LINKS];
     tBTM_ESCO_PARAMS     def_esco_parms;
     BD_ADDR              xfer_addr;
-    UINT16               sco_disc_reason;
     BOOLEAN              esco_supported;    /* TRUE if 1.2 cntlr AND supports eSCO links */
     tBTM_SCO_TYPE        desired_sco_mode;
     tBTM_SCO_TYPE        xfer_sco_type;

components/bt/host/bluedroid/stack/include/stack/btm_api.h

@@ -1028,9 +1028,6 @@ typedef void (tBTM_ACL_DB_CHANGE_CB) (BD_ADDR p_bda, DEV_CLASS p_dc,
 #define BTM_INVALID_SCO_INDEX       0xFFFF
 #define BTM_INVALID_HCI_HANDLE      0xFFFF
 
-/* Define an invalid SCO disconnect reason */
-#define BTM_INVALID_SCO_DISC_REASON 0xFFFF
-
 /* Define first active SCO index */
 #define BTM_FIRST_ACTIVE_SCO_INDEX  BTM_MAX_SCO_LINKS
 
@@ -3261,21 +3258,6 @@ UINT16 BTM_ReadScoHandle (UINT16 sco_inx);
 UINT8 *BTM_ReadScoBdAddr (UINT16 sco_inx);
 
 
-/*******************************************************************************
-**
-** Function         BTM_ReadScoDiscReason
-**
-** Description      This function is returns the reason why an (e)SCO connection
-**                  has been removed. It contains the value until read, or until
-**                  another (e)SCO connection has disconnected.
-**
-** Returns          HCI reason or BTM_INVALID_SCO_DISC_REASON if not set.
-**
-*******************************************************************************/
-//extern
-UINT16 BTM_ReadScoDiscReason (void);
-
-
 /*******************************************************************************
 **
 ** Function         BTM_SetEScoMode