[PATCH v7 4/8] blktrace: annotate required lock on do_blk_trace_setup()

Luis Chamberlain
2020-06-19T20:47:47Z

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

Suggested-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Luis Chamberlain <mcgrof@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