From: Gerhard Sittig <redacted>
Date: Sat, 22 May 2021 11:54:52 +0000 (+0200)
Subject: scpi-pps: don't break SCPI devices when scanning for HP-IB devices
X-Git-Url: https://sigrok.org/gitaction?a=commitdiff_plain;h=7f0463840ab5d6a85daaa76850558d2b71e596cf;p=libsigrok.git

scpi-pps: don't break SCPI devices when scanning for HP-IB devices

Only scan for hpib-pps devices when a user provided conn= specification
was given. This avoids breaking SCPI devices by emitting non-standard
requests before reliable device identification.
---

diff --git a/src/hardware/scpi-pps/api.c b/src/hardware/scpi-pps/api.c
index ed9fbd9d..aa5b945a 100644
--- a/src/hardware/scpi-pps/api.c
+++ b/src/hardware/scpi-pps/api.c
@@ -254,6 +254,17 @@ static GSList *scan_scpi_pps(struct sr_dev_driver *di, GSList *options)
 
 static GSList *scan_hpib_pps(struct sr_dev_driver *di, GSList *options)
 {
+	const char *conn;
+
+	/*
+	 * Only scan for HP-IB devices when conn= was specified, to not
+	 * break SCPI devices' operation.
+	 */
+	conn = NULL;
+	(void)sr_serial_extract_options(options, &conn, NULL);
+	if (!conn)
+		return NULL;
+
 	return sr_scpi_scan(di->context, options, probe_hpib_pps_device);
 }