This commit also improves the accuracy of debug messages:
a module is not "successfully" loaded when it's optional
and actually not loaded.

Fixes: #837

Signed-off-by: Philippe Proulx <[email protected]>
---
 src/bin/lttng-sessiond/modprobe.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/src/bin/lttng-sessiond/modprobe.c 
b/src/bin/lttng-sessiond/modprobe.c
index 968b265..adad7bf 100644
--- a/src/bin/lttng-sessiond/modprobe.c
+++ b/src/bin/lttng-sessiond/modprobe.c
@@ -205,8 +205,14 @@ static int modprobe_lttng(struct kern_modules_param 
*modules,
 
                ret = kmod_module_probe_insert_module(mod, 
KMOD_PROBE_IGNORE_LOADED,
                                NULL, NULL, NULL, NULL);
-               if (required && ret < 0) {
-                       ERR("Unable to load module %s", modules[i].name);
+               if (ret < 0) {
+                       if (required) {
+                               ERR("Unable to load required module %s", 
modules[i].name);
+                               return ret;
+                       } else {
+                               DBG("Unable to load optional module %s; 
continuing", modules[i].name);
+                               ret = 0;
+                       }
                } else {
                        DBG("Modprobe successfully %s", modules[i].name);
                }
-- 
2.1.0


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