tests: P2P_LISTEN immediately followed by P2P_FIND

This verifies that the previous commit works correctly by forcing a
P2P_LISTEN command execution to be interupted by a P2P_FIND command
timed in a manner that forces it to show up before the kernel ROC has
started for the Listen.

Signed-off-by: Jouni Malinen <jouni@qca.qualcomm.com>

tests/hwsim/test_p2p_discovery.py

@@ -13,6 +13,7 @@ import hwsim_utils
 from wpasupplicant import WpaSupplicant
 from p2p_utils import *
 from test_gas import start_ap
+from test_cfg80211 import nl80211_remain_on_channel
 
 def test_discovery(dev):
     """P2P device discovery and provision discovery"""
@@ -541,3 +542,24 @@ def test_discovery_after_gas(dev, apdev):
     logger.info("Device discovery after fragmented GAS took %f seconds" % (end - start))
     if end - start > 1.3:
         raise Exception("Device discovery took unexpectedly long time")
+
+def test_discovery_listen_find(dev):
+    """P2P_LISTEN immediately followed by P2P_FIND"""
+    # Request an external remain-on-channel operation to delay start of the ROC
+    # for the following p2p_listen() enough to get p2p_find() processed before
+    # the ROC started event shows up. This is done to test a code path where the
+    # p2p_find() needs to clear the wait for the pending listen operation
+    # (p2p->pending_listen_freq).
+    ifindex = int(dev[0].get_driver_status_field("ifindex"))
+    nl80211_remain_on_channel(dev[0], ifindex, 2417, 200)
+
+    addr0 = dev[0].p2p_dev_addr()
+    dev[0].p2p_listen()
+    dev[0].p2p_find(social=True)
+    time.sleep(0.4)
+    dev[1].p2p_listen()
+    ev = dev[0].wait_global_event(["P2P-DEVICE-FOUND"], timeout=1.2)
+    if not dev[1].discover_peer(addr0):
+        raise Exception("Device discovery timed out")
+    if ev is None:
+        raise Exception("Did not find peer quickly enough after stopped P2P_LISTEN")