Commit f5a4da3f authored Aug 22, 2018 by Mayank Rana

usb: f_gsi: Resume USB on handling disconnect event in suspend state

Currently USB GSI function driver releases pm runtime usage count and
child count on receiving suspend event i.e. it doesn't prevent USB going
into LPM. There is race condition seen while USB going into LPM in
parallel USB GSI driver is trying to free allocated TRB ring. Due to USB
SMMU usage, it is must to have USB SMMU attach while freeing TRB ring.
Hence fix this issue by incrementing pm runtime usage count and child
count when handling disconnect event while USB GSI state is suspended
before trying to free TRB ring.

Change-Id: Icd9d43a6cd8956a1bdca219ad9686a57e89989c8
Signed-off-by: Mayank Rana <mrana@codeaurora.org>

parent e137b4a2

drivers/usb/gadget/function/f_gsi.c

+2 −0

Original line number	Original line	Diff line number	Diff line
	@@ -827,9 +827,11 @@ static void ipa_work_handler(struct work_struct *w)
	ipa_resume_work_handler(d_port);		ipa_resume_work_handler(d_port);
	d_port->sm_state = STATE_CONNECTED;		d_port->sm_state = STATE_CONNECTED;
	} else if (event == EVT_DISCONNECTED) {		} else if (event == EVT_DISCONNECTED) {
			usb_gadget_autopm_get(d_port->gadget);
	ipa_disconnect_work_handler(d_port);		ipa_disconnect_work_handler(d_port);
	d_port->sm_state = STATE_INITIALIZED;		d_port->sm_state = STATE_INITIALIZED;
	log_event_dbg("%s: ST_SUS_EVT_DIS", __func__);		log_event_dbg("%s: ST_SUS_EVT_DIS", __func__);
			usb_gadget_autopm_put_async(d_port->gadget);
	}		}
	break;		break;
	default:		default: