Commit a542ccc7 authored Aug 11, 2015 by Srinu Jella Committed by Andre Eisenbach Mar 04, 2016

Added fd for monitoring when the channel is not congested

Use case:
Skips and Media Audio Loss are Observed During PAN Connection

Steps:
1. Launched Local Music and Media Audio was in Headset.
2. Paired and Connected to other Phone to DUT Over BT Tethering.
3. While  Listening to Media Audio in DUT, Started Watching
   Youtube in other phone.
4. Observed Below Observations During Some 30mins of PAN Connection.

Failure:
Skips and Media Audio Loss are Observed During PAN Connection

Root Cause:
socket monitor thread keeps polling for PAN fd, eventually
it will make the BTU thread also busy, inturn NOCP processing
gets delayed.

Fix:
Add PAN fd for monitoring only when L2CAP channel related to
PAN profile is not congested. It will break loop by checking the
congestion status to put the fd for polling.

Change-Id: I2119c6c86d8e4798e516c512ad7aac7630b85a6a

parent cc6d7dad

system/btif/src/btif_pan.c

+5 −2

Original line number	Diff line number	Diff line
		@@ -787,9 +787,12 @@ static void btu_exec_tap_fd_read(void *p_param) {
		if (poll(&ufd, 1, 0) <= 0 \|\| IS_EXCEPTION(ufd.revents))
		break;
		}
		//add fd back to monitor thread

		if (btpan_cb.flow) {
		//add fd back to monitor thread when the flow is on
		btsock_thread_add_fd(pan_pth, fd, 0, SOCK_THREAD_FD_RD, 0);
		}
		}

		static void btif_pan_close_all_conns() {
		if (!stack_initialized)