X-Git-Url: https://sigrok.org/gitweb/?a=blobdiff_plain;f=src%2Fscpi%2Fscpi_libgpib.c;h=5c82bd6f3dee6edd2e27a25292d16667d10fad27;hb=22fdb67fa0714c11cc0a58ee1423f55d18a4f080;hp=4519a4e70e2da78589c35c779e12287432f28595;hpb=8107a9a650f4db08423c3fc79c1b7e7d826ffd7f;p=libsigrok.git

diff --git a/src/scpi/scpi_libgpib.c b/src/scpi/scpi_libgpib.c
index 4519a4e7..5c82bd6f 100644
--- a/src/scpi/scpi_libgpib.c
+++ b/src/scpi/scpi_libgpib.c
@@ -169,13 +169,16 @@ SR_PRIV int sr_scpi_gpib_spoll(struct sr_scpi_dev_inst *scpi, char *buf)
 {
 	struct scpi_gpib *gscpi = scpi->priv;
 
+	g_mutex_lock(&scpi->scpi_mutex);
 	ibrsp(gscpi->descriptor, buf);
 
 	if (ibsta & ERR) {
 		sr_err("Error while serial polling: iberr = %s.",
 			gpib_error_string(iberr));
+		g_mutex_unlock(&scpi->scpi_mutex);
 		return SR_ERR;
 	}
+	g_mutex_unlock(&scpi->scpi_mutex);
 	sr_spew("Successful serial poll: 0x%x", (uint8_t)buf[0]);
 
 	return SR_OK;
@@ -184,6 +187,7 @@ SR_PRIV int sr_scpi_gpib_spoll(struct sr_scpi_dev_inst *scpi, char *buf)
 SR_PRIV const struct sr_scpi_dev_inst scpi_libgpib_dev = {
 	.name          = "GPIB",
 	.prefix        = "libgpib",
+	.transport     = SCPI_TRANSPORT_LIBGPIB,
 	.priv_size     = sizeof(struct scpi_gpib),
 	.dev_inst_new  = scpi_gpib_dev_inst_new,
 	.open          = scpi_gpib_open,