uvc: ack SET_CUR after data

scripts/daemon/lesavka-core.sh

@@ -96,7 +96,13 @@ case "${1:-}" in
         ;;
 esac
 
-cleanup() { echo "" >"$G/UDC" 2>/dev/null || true; }
+cleanup() {
+    if [[ -n ${LESAVKA_ALLOW_GADGET_RESET:-} ]]; then
+        LESAVKA_DETACH_CLEAR_UDC=1 detach_gadget
+    else
+        detach_gadget
+    fi
+}
 
 DISABLE_UAC=${LESAVKA_DISABLE_UAC:-}
 DISABLE_UVC=${LESAVKA_DISABLE_UVC:-}
@@ -186,6 +192,17 @@ fi
 [[ -n $UDC ]] || { log "❌ UDC not present after manual bind"; exit 1; }
 log "✅ UDC detected: $UDC"
 
+# Guard against lockups: if the gadget is already bound, don't reset unless forced.
+BOUND_UDC=""
+if [[ -r $G/UDC ]]; then
+    BOUND_UDC=$(cat "$G/UDC" 2>/dev/null || true)
+fi
+if [[ -n $BOUND_UDC && -z ${LESAVKA_ALLOW_GADGET_RESET:-} ]]; then
+    log "🔒 gadget already bound to '$BOUND_UDC' - refusing reset."
+    log "    Set LESAVKA_ALLOW_GADGET_RESET=1 to force."
+    exit 0
+fi
+
 # Guard against lockups: don't reset gadget while host is attached unless forced.
 UDC_STATE="$(udc_state "$UDC")"
 if [[ -z ${LESAVKA_ALLOW_GADGET_RESET:-} ]] && is_attached_state "$UDC_STATE"; then

server/src/bin/lesavka-uvc.rs

@@ -384,9 +384,6 @@ fn handle_setup(
             return;
         }
         *pending = Some(PendingRequest { interface, selector });
-        let len = req.w_length as usize;
-        let payload = vec![0u8; len.min(UVC_DATA_SIZE)];
-        let _ = send_response(fd, uvc_send_response, &payload);
         if debug {
             eprintln!(
                 "[lesavka-uvc] SET_CUR queued len={} iface={} sel={}",
@@ -525,7 +522,8 @@ fn handle_data(
                 );
             }
         }
-        // No extra response required; ep0 data stage completion ends the control transfer.
+        // ACK the OUT transfer after we've processed the payload.
+        let _ = send_response(fd, uvc_send_response, &[]);
     }
 }