高通平台wifi--p2p issue

需求：

p2p: check p2p instance in all asynchronized callbacks

If cancelConnect is not called, the scan retry callback would be called several times. If P2P is disabled in this period,these asynchronized callbacks would access de-initialized p2p instance and result in native crash.

code：

1. ------------------- wpa_supplicant/hidl/1.2/p2p_iface.cpp --------------------

2. index 0a6b657d..fd9ce0dc 100644

3. @@ -225,7 +225,7 @@ int joinScanReq(

4. size_t ielen;

5. unsigned int bands;

7. - if (!wpa_s->global->p2p) {

8. + if (wpa_s->global->p2p == NULL || wpa_s->global->p2p_disabled) {

9. wpa_printf(MSG_ERROR,

10. "P2P: P2P interface is gone, cancel join scan");

11. return -ENXIO;

12. @@ -1634,7 +1634,7 @@ SupplicantStatus P2pIface::addGroup_1_2Internal(

13. int vht = wpa_s->conf->p2p_go_vht;

14. int ht40 = wpa_s->conf->p2p_go_ht40 || vht;

16. - if (wpa_s->global->p2p == NULL) {

17. + if (wpa_s->global->p2p == NULL || wpa_s->global->p2p_disabled) {

18. return {SupplicantStatusCode::FAILURE_IFACE_DISABLED, ""};

19. }

21. @@ -1691,6 +1691,9 @@ SupplicantStatus P2pIface::addGroup_1_2Internal(

23. pending_join_scan_callback =

24. [wpa_s, ssid, freq]() {

25. + if (wpa_s->global->p2p == NULL || wpa_s->global->p2p_disabled) {

26. + return;

27. + }

28. int ret = joinScanReq(wpa_s, ssid, freq);

29. // for BUSY case, the scan might be occupied by WiFi.

30. // Do not give up immediately, but try again later.

31. @@ -1707,7 +1710,7 @@ SupplicantStatus P2pIface::addGroup_1_2Internal(

32. };

34. pending_scan_res_join_callback = [wpa_s, ssid, passphrase, peer_address, this]() {

35. - if (wpa_s->global->p2p_disabled) {

36. + if (wpa_s->global->p2p == NULL || wpa_s->global->p2p_disabled) {

37. return;

38. }

解释：

p2p_iface.cpp是守护wpa_supplicant的hidl接口