From: Cornelia Huck <cornelia.huck@de.ibm.com>
Date: Fri, 27 Jul 2007 10:29:20 +0000 (+0200)
Subject: [S390] cio: Make CIO_* macros safe if dbfs are not available.
X-Git-Tag: firefly_0821_release~27059^2~2
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=303fa9e39605c1d56971dd22cd04d2186dc42c98;p=firefly-linux-kernel-4.4.55.git

[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>
---

diff --git a/drivers/s390/cio/cio_debug.h b/drivers/s390/cio/cio_debug.h
index f88844adae1b..c9bf8989930f 100644
--- 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;