mod_freetdm: Handle read errors gracefully when the device is dead already

diff --git a/libs/freetdm/mod_freetdm/mod_freetdm.c b/libs/freetdm/mod_freetdm/mod_freetdm.c
index 3ac9bd0a36a6eabe8db5bafa389616fa4e617a27..227d5a698fcc20fa140d2d17248b06efe252c239 100755 (executable)
--- a/libs/freetdm/mod_freetdm/mod_freetdm.c
+++ b/libs/freetdm/mod_freetdm/mod_freetdm.c
@@ -789,11 +789,16 @@ static switch_status_t channel_read_frame(switch_core_session_t *session, switch
 
        len = tech_pvt->read_frame.buflen;
        if (ftdm_channel_read(tech_pvt->ftdmchan, tech_pvt->read_frame.data, &len) != FTDM_SUCCESS) {
+               if (switch_test_flag(tech_pvt, TFLAG_DEAD)) {
+                       switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_DEBUG, "Failed to read from dead channel %s device %d:%d\n", name, span_id, chan_id);
+                       goto normal_failure;
+               }
                switch_log_printf(SWITCH_CHANNEL_CHANNEL_LOG(channel), SWITCH_LOG_WARNING, "Failed to read from channel %s device %d:%d!\n", name, span_id, chan_id);
                if (++tech_pvt->read_error > FTDM_MAX_READ_WRITE_ERRORS) {
                        switch_log_printf(SWITCH_CHANNEL_CHANNEL_LOG(channel), SWITCH_LOG_ERROR, "too many I/O read errors on channel %s device %d:%d!\n", name, span_id, chan_id);
                        goto fail;
                }
+
        } else {
                tech_pvt->read_error = 0;
        }
@@ -822,6 +827,7 @@ static switch_status_t channel_read_frame(switch_core_session_t *session, switch
 
 fail:
        switch_log_printf(SWITCH_CHANNEL_CHANNEL_LOG(channel), SWITCH_LOG_ERROR, "clearing IO in channel %s device %d:%d!\n", name, span_id, chan_id);
+normal_failure:
        switch_clear_flag_locked(tech_pvt, TFLAG_IO);
        return SWITCH_STATUS_GENERR;
 }