[PATCH v6 4/6] blktrace: annotate required lock on do_blk_trace_setup()

[Luis Chamberlain]

Ensure it is clear which lock is required on do_blk_trace_setup().

Suggested-by: Bart Van Assche <bvanass...@acm.org>
Signed-off-by: Luis Chamberlain <mcg...@kernel.org>
---
 kernel/trace/blktrace.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/kernel/trace/blktrace.c b/kernel/trace/blktrace.c
index 7f60029bdaff..7ff2ea5cd05e 100644
--- a/kernel/trace/blktrace.c
+++ b/kernel/trace/blktrace.c
@@ -483,6 +483,8 @@ static int do_blk_trace_setup(struct request_queue *q, char 
*name, dev_t dev,
        struct dentry *dir = NULL;
        int ret;
 
+       lockdep_assert_held(&q->blk_trace_mutex);
+
        if (!buts->buf_size || !buts->buf_nr)
                return -EINVAL;
 
-- 
2.26.2