[S390] cio: Make CIO_* macros safe if dbfs are not available.

Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
git-mirror · Jul 27, 2007 · 303fa9e · 303fa9e
1 parent e556bbb
commit 303fa9e
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/drivers/s390/cio/cio_debug.h b/drivers/s390/cio/cio_debug.h
@@ -23,6 +23,8 @@ extern debug_info_t *cio_debug_crw_id;
 static inline void
 CIO_HEX_EVENT(int level, void *data, int length)
 {
+	if (unlikely(!cio_debug_trace_id))
+		return;
 	while (length > 0) {
 		debug_event(cio_debug_trace_id, level, data, length);
 		length -= cio_debug_trace_id->buf_size;