dmm/metex14: unbreak packet request helper return code

[libsigrok.git] / src / dmm / metex14.c

diff --git a/src/dmm/metex14.c b/src/dmm/metex14.c
index 5c4ed0858c2816c8278ac0bfaad2d74c584422a1..d93052a85b84bc7cbfbe50b5b3c266df50dbf665 100644 (file)
--- a/src/dmm/metex14.c
+++ b/src/dmm/metex14.c
@@ -332,10 +332,19 @@ static gboolean flags_valid(const struct metex14_info *info)
 SR_PRIV int sr_metex14_packet_request(struct sr_serial_dev_inst *serial)
 {
        const uint8_t wbuf = 'D';
+       size_t wrlen;
+       int ret;
 
        sr_spew("Requesting DMM packet.");
 
-       return serial_write_blocking(serial, &wbuf, 1, 0);
+       wrlen = sizeof(wbuf);
+       ret = serial_write_blocking(serial, &wbuf, wrlen, 0);
+       if (ret < 0)
+               return ret;
+       if ((size_t)ret != wrlen)
+               return SR_ERR_IO;
+
+       return SR_OK;
 }
 #endif