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etherwpi: afra support

--- a/sys/src/9/pc/etherwpi.c

+++ b/sys/src/9/pc/etherwpi.c

@@ -1426,7 +1426,7 @@

 		if((w->fc[0] & 0x0c) == 0x08 &&	ctlr->bssnodeid != -1){

 			timeout = 0;

 			nodeid = ctlr->bssnodeid;

-			p = wn->maxrate;

+			p = wn->actrate;

 		}

 	}

 	qunlock(ctlr);

@@ -1631,6 +1631,8 @@

 	rx = &ctlr->rx;

 	if(ctlr->broken || ctlr->shared == nil || rx->b == nil)

 		return;

+

+	bb = nil;

 	for(hw = ctlr->shared->next % Nrx; rx->i != hw; rx->i = (rx->i + 1) % Nrx){

 		uchar type, flags, idx, qid;

 		u32int len;

@@ -1651,14 +1653,15 @@

 if(0) iprint("rxdesc[%d] type=%d len=%d idx=%d qid=%d\n", rx->i, type, len, idx, qid);

+		if(bb != nil){

+			freeb(bb);

+			bb = nil;

+		}

 		if((qid & 0x80) == 0 && qid < nelem(ctlr->tx)){

 			tx = &ctlr->tx[qid];

 			if(tx->n > 0){

 				bb = tx->b[idx];

-				if(bb != nil){

-					tx->b[idx] = nil;

-					freeb(bb);

-				}

+				tx->b[idx] = nil;

 				tx->n--;

 				wakeup(tx);

 			}

@@ -1697,6 +1700,9 @@

 			continue;

 		case 28:	/* tx done */

+			if(len <= 8 || d[8] == 1)

+				break;

+			wifitxfail(ctlr->wifi, bb);

 			break;

 		case 130:	/* start scan */

@@ -1710,6 +1716,8 @@

 		}

 	}

 	csr32w(ctlr, FhRxWptr, ((hw+Nrx-1) % Nrx) & ~7);

+	if(bb != nil)

+		freeb(bb);

 }

 static void