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etheriwl: allow switching channels in promisc mode

promisc mode prevented the call to rxon() in transmit
possibly causing association to fail while running snoopy.

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

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

@@ -1723,6 +1723,8 @@

 	filter = FilterNoDecrypt | FilterMulticast | FilterBeacon;

 	if(ctlr->prom){

 		filter |= FilterPromisc;

+		if(bss != nil)

+			ctlr->channel = bss->channel;

 		bss = nil;

 	}

 	if(bss != nil){

@@ -1843,10 +1845,8 @@

 		return;

 	}

-	if(ctlr->prom == 0)

-	if(wn->aid != ctlr->aid

-	|| wn->channel != ctlr->channel

-	|| memcmp(wn->bssid, ctlr->bssid, Eaddrlen) != 0)

+	if((wn->channel != ctlr->channel)

+	|| (!ctlr->prom && (wn->aid != ctlr->aid || memcmp(wn->bssid, ctlr->bssid, Eaddrlen) != 0)))

 		rxon(edev, wn);

 	if(b == nil){

-- 

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