[PATCH v7 4/8] blktrace: annotate required lock on do_blk_trace_setup()
From: Luis Chamberlain <mcgrof@kernel.org>
Date: 2020-06-19 20:47:44
Also in:
linux-fsdevel, linux-mm, lkml
Subsystem:
block layer, the rest, tracing · Maintainers:
Jens Axboe, Linus Torvalds, Steven Rostedt, Masami Hiramatsu
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