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authorLuis Chamberlain <mcgrof@kernel.org>2020-06-19 20:47:26 +0000
committerJens Axboe <axboe@kernel.dk>2020-06-24 09:15:58 -0600
commita67549c8e568627290234e9fbe833cb9dfd36b55 (patch)
treeac319553d06643c219235dc5d2951ae8e8ac3c2f
parente8c7d14ac6c37c173ec606907d38802b00302988 (diff)
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 <bvanassche@acm.org> Signed-off-by: Luis Chamberlain <mcgrof@kernel.org> Reviewed-by: Bart Van Assche <bvanassche@acm.org> Signed-off-by: Jens Axboe <axboe@kernel.dk>
-rw-r--r--kernel/trace/blktrace.c2
1 files changed, 2 insertions, 0 deletions
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;