From a7be14ada20d594c5338613a73788e8f89c0d9d5 Mon Sep 17 00:00:00 2001
From: Bert Vermeulen <bert@biot.com>
Date: Mon, 15 Apr 2013 18:45:38 +0200
Subject: [PATCH] rigol-ds1xx2: Don't assume there's a valid sdi

---
 hardware/rigol-ds1xx2/api.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/hardware/rigol-ds1xx2/api.c b/hardware/rigol-ds1xx2/api.c
index 5e4198ce..595d73e6 100644
--- a/hardware/rigol-ds1xx2/api.c
+++ b/hardware/rigol-ds1xx2/api.c
@@ -501,7 +501,7 @@ static int config_list(int key, GVariant **data, const struct sr_dev_inst *sdi)
 	GVariant *tuple, *rational[2];
 	GVariantBuilder gvb;
 	unsigned int i;
-	struct dev_context *devc = sdi->priv;
+	struct dev_context *devc;
 
 	switch (key) {
 	case SR_CONF_DEVICE_OPTIONS:
@@ -532,6 +532,10 @@ static int config_list(int key, GVariant **data, const struct sr_dev_inst *sdi)
 		*data = g_variant_builder_end(&gvb);
 		break;
 	case SR_CONF_TRIGGER_SOURCE:
+		if (!sdi || !sdi->priv)
+			/* Can't know this until we have the exact model. */
+			return SR_ERR_ARG;
+		devc = sdi->priv;
 		*data = g_variant_new_strv(trigger_sources,
 				devc->has_digital ? ARRAY_SIZE(trigger_sources) : 4);
 		break;