From: mia soweli <inbox@tachibana-labs.org>
Date: Sun, 21 May 2023 17:01:43 +0000
Subject: [PATCH] nusb/ether: set configuration, and use the first interface that matches


before, we were parsing all configurations, to find the cdc union,
but we would not set the config. this means we would try to talk cdc ethernet to whatever the first configuration is.

this makes cdc ethernet work on my rtl8156.
---
diff daeb5b0ab6d6342dd7d4a25ee6380f67082cfbed 7df4a1cd04d3c77382fbe58062bfb95ed2fb2035
--- a/sys/src/cmd/nusb/ether/ether.c
+++ b/sys/src/cmd/nusb/ether/ether.c
@@ -642,15 +642,18 @@
 		ctlif = datif = nil;
 		for(j = 0; j < nelem(c->iface); j++){
 			for(iface = c->iface[j]; iface != nil; iface = iface->next){
-				if(iface->id == ctlid)
+				if(ctlif == nil && iface->id == ctlid)
 					ctlif = iface;
-				if(iface->id == datid)
+				if(datif == nil && iface->id == datid)
 					datif = iface;
 			}
 			if(datif != nil && ctlif != nil){
-				if(Subclass(ctlif->csp) == Scether)
+				if(Subclass(ctlif->csp) == Scether) {
+					if(setconf(d, c) < 0)
+						break;
 					if(ifaceinit(d, datif, ein, eout) != -1)
 						return 0;
+				}
 				break;
 			}
 		}		
@@ -659,6 +662,8 @@
 	/* try any other one that seems to be ok */
 	for(i = 0; i < nelem(ud->conf); i++){
 		if((c = ud->conf[i]) != nil){
+			if(setconf(d, c) < 0)
+				break;
 			for(j = 0; j < nelem(c->iface); j++){
 				for(datif = c->iface[j]; datif != nil; datif = datif->next){
 					if(ifaceinit(d, datif, ein, eout) != -1)