hp-3478a: revert the recent NULL dereference check in config API routines

[libsigrok.git] / src / hardware / hp-3457a / api.c

diff --git a/src/hardware/hp-3457a/api.c b/src/hardware/hp-3457a/api.c
index f828cfd817f3743c7c764561c8ac8c5737285cff..9f006df5600f43889b8a58bfde775c079c49c14d 100644 (file)
--- a/src/hardware/hp-3457a/api.c
+++ b/src/hardware/hp-3457a/api.c
@@ -52,12 +52,9 @@ static int create_front_channel(struct sr_dev_inst *sdi, int chan_idx)
                                 TRUE, "Front");
        channel->priv = chanc;
 
-       front = g_malloc0(sizeof(*front));
-       front->name = g_strdup("Front");
+       front = sr_channel_group_new(sdi, "Front", NULL);
        front->channels = g_slist_append(front->channels, channel);
 
-       sdi->channel_groups = g_slist_append(sdi->channel_groups, front);
-
        return chan_idx;
 }
 
@@ -74,10 +71,7 @@ static int create_rear_channels(struct sr_dev_inst *sdi, int chan_idx,
        if (!card)
                return chan_idx;
 
-       group = g_malloc0(sizeof(*group));
-       group->priv = NULL;
-       group->name = g_strdup(card->cg_name);
-       sdi->channel_groups = g_slist_append(sdi->channel_groups, group);
+       group = sr_channel_group_new(sdi, card->cg_name, NULL);
 
        for (i = 0; i < card->num_channels; i++) {
 
@@ -127,6 +121,14 @@ static struct sr_dev_inst *probe_device(struct sr_scpi_dev_inst *scpi)
        struct sr_dev_inst *sdi;
        struct dev_context *devc;
 
+       /*
+        * The device cannot get identified by means of SCPI queries.
+        * Neither shall non-SCPI requests get emitted before reliable
+        * identification of the device. Assume that we only get here
+        * when user specs led us to believe it's safe to communicate
+        * to the expected kind of device.
+        */
+
        /*
         * This command ensures we receive an EOI after every response, so that
         * we don't wait the entire timeout after the response is received.
@@ -170,6 +172,14 @@ static struct sr_dev_inst *probe_device(struct sr_scpi_dev_inst *scpi)
 
 static GSList *scan(struct sr_dev_driver *di, GSList *options)
 {
+       const char *conn;
+
+       /* Only scan for a device when conn= was specified. */
+       conn = NULL;
+       (void)sr_serial_extract_options(options, &conn, NULL);
+       if (!conn)
+               return NULL;
+
        return sr_scpi_scan(di->context, options, probe_device);
 }