linux-kernel - [PATCH] block: misplaced rq

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Date:	Wed,  1 Oct 2014 14:32:31 +0200
From:	Hannes Reinecke <hare@...e.de>
To:	Jens Axboe <axboe@...nel.dk>
Cc:	Tejun Heo <tj@...nel.org>, Christoph Hellwig <hch@....de>,
	linux-kernel@...r.kernel.org, Hannes Reinecke <hare@...e.de>
Subject: [PATCH] block: misplaced rq_complete tracepoint

The rq_complete tracepoint was never issued for empty requests,
causing the resulting blktrace information to never show any
completion for those request.

Signed-off-by: Hannes Reinecke <hare@...e.de>
---
 block/blk-core.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/block/blk-core.c b/block/blk-core.c
index 3aff9f5..eb05abf 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -2414,11 +2414,11 @@ bool blk_update_request(struct request *req, int error, unsigned int nr_bytes)
 {
 	int total_bytes;
 
+	trace_block_rq_complete(req->q, req, nr_bytes);
+
 	if (!req->bio)
 		return false;
 
-	trace_block_rq_complete(req->q, req, nr_bytes);
-
 	/*
 	 * For fs requests, rq is just carrier of independent bio's
 	 * and each partial completion should be handled separately.
-- 
1.8.5.2

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