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Don't start session with 0-channel devices. 

Drivers aren't really able to deal with that in some cases, and it
denotes a frontend bug.
This commit is contained in:
Bert Vermeulen 2014-09-10 18:21:51 +02:00
parent cfd8ec53ab
commit 013ec84b83
1 changed files with 18 additions and 2 deletions
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20
src/session.c
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@ -434,8 +434,9 @@ static int verify_trigger(struct sr_trigger *trigger)
SR_API int sr_session_start(struct sr_session *session)
{
struct sr_dev_inst *sdi;
GSList *l;
int ret;
struct sr_channel *ch;
GSList *l, *c;
int enabled_channels, ret;
if (!session) {
sr_err("%s: session was NULL", __func__);
@ -456,6 +457,21 @@ SR_API int sr_session_start(struct sr_session *session)
ret = SR_OK;
for (l = session->devs; l; l = l->next) {
sdi = l->data;
enabled_channels = 0;
for (c = sdi->channels; c; c = c->next) {
ch = c->data;
if (ch->enabled) {
enabled_channels++;
break;
}
}
if (enabled_channels == 0) {
ret = SR_ERR;
sr_err("%s instance %d has no enabled channels!",
sdi->driver->name, sdi->index);
break;
}
if ((ret = sr_config_commit(sdi)) != SR_OK) {
sr_err("Failed to commit device settings before "
"starting acquisition (%s)", sr_strerror(ret));