no more segfault when frontend device is busy

diff --git a/lib/dvb/frontend.cpp b/lib/dvb/frontend.cpp
index e3bd5bc..e495b1c 100644 (file)
--- a/lib/dvb/frontend.cpp
+++ b/lib/dvb/frontend.cpp
@@ -1680,6 +1680,12 @@ RESULT eDVBFrontend::tune(const iDVBFrontendParameters &where)
 
        int res=0;
 
+       if (!m_sn)
+       {
+               eDebug("no frontend device opened... do not try to tune !!!");
+               return -ENODEV;
+       }
+
        if (m_type == -1)
                return -ENODEV;