Merge "dsp-kernel: Handle race-condition in dsp signal"

dsp/adsprpc.c

@@ -7050,6 +7050,11 @@ int fastrpc_dspsignal_wait(struct fastrpc_file *fl,
 	if (s->state != DSPSIGNAL_STATE_PENDING) {
 		if ((s->state == DSPSIGNAL_STATE_CANCELED) || (s->state == DSPSIGNAL_STATE_UNUSED))
 			err = -EINTR;
+		if (s->state == DSPSIGNAL_STATE_SIGNALED) {
+			/* Signal already received from DSP. Reset signal state and return */
+			s->state = DSPSIGNAL_STATE_PENDING;
+			reinit_completion(&s->comp);
+		}
 		spin_unlock_irqrestore(&fl->dspsignals_lock, irq_flags);
 		DSPSIGNAL_VERBOSE("Signal %u in state %u, complete wait immediately",
 				  signal_id, s->state);