[RFC PATCH v2 07/19] dyndbg: accept null site in dynamic_emit_prefix

[Jim Cromie]

2 prints use site->member, protect them with if site.

no functional changes.

Signed-off-by: Jim Cromie <jim.cro...@gmail.com>
---
 lib/dynamic_debug.c | 16 ++++++++++------
 1 file changed, 10 insertions(+), 6 deletions(-)

diff --git a/lib/dynamic_debug.c b/lib/dynamic_debug.c
index 5422cef58130..190a796da03a 100644
--- a/lib/dynamic_debug.c
+++ b/lib/dynamic_debug.c
@@ -628,15 +628,19 @@ static char *dynamic_emit_prefix(const struct _ddebug 
*dp, char *buf)
                                        task_pid_vnr(current));
        }
        pos_after_tid = pos;
-       if (dp->flags & _DPRINTK_FLAGS_INCL_MODNAME)
-               pos += snprintf(buf + pos, remaining(pos), "%s:",
-                               desc->modname);
-       if (dp->flags & _DPRINTK_FLAGS_INCL_FUNCNAME)
-               pos += snprintf(buf + pos, remaining(pos), "%s:",
-                               desc->function);
+
+       if (desc) {
+               if (dp->flags & _DPRINTK_FLAGS_INCL_MODNAME)
+                       pos += snprintf(buf + pos, remaining(pos), "%s:",
+                                       desc->modname);
+               if (dp->flags & _DPRINTK_FLAGS_INCL_FUNCNAME)
+                       pos += snprintf(buf + pos, remaining(pos), "%s:",
+                                       desc->function);
+       }
        if (dp->flags & _DPRINTK_FLAGS_INCL_LINENO)
                pos += snprintf(buf + pos, remaining(pos), "%d:",
                                dp->lineno);
+
        if (pos - pos_after_tid)
                pos += snprintf(buf + pos, remaining(pos), " ");
        if (pos >= PREFIX_SIZE)
-- 
2.29.2