RFNoC: Demoted zero sample error to warning

Requesting zero samples was resulting in an error and causing applications
to crash.  This was a change frome previous versions of UHD.  Demoted to
warning so applications continue as they did before.

Signed-off-by: Michael West <michael.west@ettus.com>

1 files changed, 11 insertions, 5 deletions

diff --git a/host/lib/usrp/cores/rx_vita_core_3000.cpp b/host/lib/usrp/cores/rx_vita_core_3000.cpp
index 368ae8e0a..fb3305ce8 100644
--- a/host/lib/usrp/cores/rx_vita_core_3000.cpp
+++ b/host/lib/usrp/cores/rx_vita_core_3000.cpp
@@ -82,12 +82,18 @@ struct rx_vita_core_3000_impl : rx_vita_core_3000
             // not setup yet!";
             return;
         }
-        if ((stream_cmd.stream_mode == stream_cmd_t::STREAM_MODE_NUM_SAMPS_AND_DONE
+        if (stream_cmd.stream_mode == stream_cmd_t::STREAM_MODE_NUM_SAMPS_AND_DONE
                 || stream_cmd.stream_mode == stream_cmd_t::STREAM_MODE_NUM_SAMPS_AND_MORE)
-            && stream_cmd.num_samps > 0x0fffffff) {
-            throw uhd::assertion_error(
-                "Invalid stream command: num_samps exceeds maximum value! "
-                "(Note: Chain multiple commands to request larger bursts)");
+        {
+            if (stream_cmd.num_samps == 0) {
+                UHD_LOGGER_WARNING("CORES") << "Ignoring stream command for finite acquisition of zero samples";
+                return;
+            }
+            if (stream_cmd.num_samps > 0x0fffffff) {
+                throw uhd::assertion_error(
+                    "Invalid stream command: num_samps exceeds maximum value! "
+                    "(Note: Chain multiple commands to request larger bursts)");
+            }
         }
 
         // setup the mode to instruction flags