From a67549c8e568627290234e9fbe833cb9dfd36b55 Mon Sep 17 00:00:00 2001 From: Luis Chamberlain Date: Fri, 19 Jun 2020 20:47:26 +0000 Subject: blktrace: annotate required lock on do_blk_trace_setup() Ensure it is clear which lock is required on do_blk_trace_setup(). Suggested-by: Bart Van Assche Signed-off-by: Luis Chamberlain Reviewed-by: Bart Van Assche Signed-off-by: Jens Axboe --- kernel/trace/blktrace.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/kernel/trace/blktrace.c b/kernel/trace/blktrace.c index 5ef0484513ec..5a88a6b55933 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; -- cgit v1.2.3