[PATCH v2 2/9] log: don't build the trace buffer when log is not ready

[Patrick Delaunay]

Update _log function to drop any traces when log is yet initialized:
vsnprintf is no more executed in this case.

This patch allows to reduce the cost for the dropped early debug trace.

Reviewed-by: Simon Glass <sjg at chromium.org>
Signed-off-by: Patrick Delaunay <patrick.delaunay at st.com>
---

(no changes since v1)

 common/log.c | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/common/log.c b/common/log.c
index ce39918e04..212789d6b3 100644
--- a/common/log.c
+++ b/common/log.c
@@ -228,6 +228,9 @@ int _log(enum log_category_t cat, enum log_level_t level, const char *file,
 	struct log_rec rec;
 	va_list args;
 
+	if (!gd)
+		return -ENOSYS;
+
 	/* Check for message continuation */
 	if (cat == LOGC_CONT)
 		cat = gd->logc_prev;
@@ -240,15 +243,15 @@ int _log(enum log_category_t cat, enum log_level_t level, const char *file,
 	rec.file = file;
 	rec.line = line;
 	rec.func = func;
+
+	if (!(gd->flags & GD_FLG_LOG_READY)) {
+		gd->log_drop_count++;
+		return -ENOSYS;
+	}
 	va_start(args, fmt);
 	vsnprintf(buf, sizeof(buf), fmt, args);
 	va_end(args);
 	rec.msg = buf;
-	if (!gd || !(gd->flags & GD_FLG_LOG_READY)) {
-		if (gd)
-			gd->log_drop_count++;
-		return -ENOSYS;
-	}
 	if (!log_dispatch(&rec)) {
 		gd->logc_prev = cat;
 		gd->logl_prev = level;
-- 
2.17.1