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ether79c970: dont disable promisc mode when multicast table is not empty

--- a/sys/src/9/pc/ether79c970.c

+++ b/sys/src/9/pc/ether79c970.c

@@ -299,7 +299,7 @@

 	ctlr->iow(ctlr, Rap, 15);

 	x = ctlr->ior(ctlr, Rdp) & ~Prom;

-	if(on)

+	if(on || ether->nmaddr > 0)

 		x |= Prom;

 	ctlr->iow(ctlr, Rdp, x);

 	ctlr->iow(ctlr, Rap, 0);

@@ -315,7 +315,8 @@

 static void

 multicast(void* arg, uchar*, int)

 {

-	promiscuous(arg, 1);

+	Ether *ether = arg;

+	promiscuous(arg, ether->prom);

 }

 static void