[PATCH] ifdef blktrace debugging fields

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Acked-by: Jens Axboe <axboe@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 4 insertions, 2 deletions

diff --git a/block/blktrace.c b/block/blktrace.c
index 2b4ef2b89b8d..8ff33441d8a2 100644
--- a/block/blktrace.c
+++ b/block/blktrace.c
@@ -450,8 +450,10 @@ int blk_trace_ioctl(struct block_device *bdev, unsigned cmd, char __user *arg)
  **/
 void blk_trace_shutdown(request_queue_t *q)
 {
-        blk_trace_startstop(q, 0);
-        blk_trace_remove(q);
+        if (q->blk_trace) {
+                blk_trace_startstop(q, 0);
+                blk_trace_remove(q);
+        }
 }
 
 /*