fix handling of unknown error rate in mbim signal state info

from gerhard@:

> According to MBIM spec, table 10-58 (MBIM_SIGNAL_STATE_INFO) a value
> of 99 means the error rate is "Unknown or undetectable".

the code was using -99 before, but properly reports unknown/null now.

diff --git a/sys/dev/usb/if_umb.c b/sys/dev/usb/if_umb.c
index fb8df89..3df4ad8 100644 (file)
--- a/sys/dev/usb/if_umb.c
+++ b/sys/dev/usb/if_umb.c
@@ -1,4 +1,4 @@
-/*     $OpenBSD: if_umb.c,v 1.53 2023/08/29 23:26:40 dlg Exp $ */
+/*     $OpenBSD: if_umb.c,v 1.54 2023/08/29 23:28:38 dlg Exp $ */
 
 /*
  * Copyright (c) 2016 genua mbH
@@ -1710,7 +1710,7 @@ umb_decode_signal_state(struct umb_softc *sc, void *data, int len)
        }
        sc->sc_info.rssi = rssi;
        sc->sc_info.ber = letoh32(ss->err_rate);
-       if (sc->sc_info.ber == -99)
+       if (sc->sc_info.ber == 99)
                sc->sc_info.ber = UMB_VALUE_UNKNOWN;
 
 #if NKSTAT > 0