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ether4330: ignore join request while bypassed

--- a/sys/src/9/bcm/ether4330.c

+++ b/sys/src/9/bcm/ether4330.c

@@ -1773,6 +1773,17 @@

 	uchar *p;

 	int n;

+	if(ctl->edev->bypass != nil){

+		/*

+		 * firmware appears to be sending broadcast frames

+		 * with unknown ethertype 0x0006 when connected,

+		 * so avoid joining while the interface is bypassed

+		 * to avoid generating traffic.

+		 */

+		ctl->status = Disconnected;

+		return;

+	}

+

 	if(chan != 0)

 		chan |= 0x2b00;		/* 20Mhz channel width */

 	p = params;