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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Jens Axboe <axboe@kernel.dk>,
        Sasha Levin <sashal@kernel.org>
Subject: [PATCH 5.7 048/376] io_uring: cleanup io_poll_remove_one() logic
Date:   Fri, 19 Jun 2020 16:29:26 +0200
Message-Id: <20200619141712.629967948@linuxfoundation.org>
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From: Jens Axboe <axboe@kernel.dk>

[ Upstream commit 3bfa5bcb26f0b52d7ae8416aa0618fff21aceaaf ]

We only need apoll in the one section, do the juggling with the work
restoration there. This removes a special case further down as well.

No functional changes in this patch.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 fs/io_uring.c | 27 +++++++++++++--------------
 1 file changed, 13 insertions(+), 14 deletions(-)

diff --git a/fs/io_uring.c b/fs/io_uring.c
index f071505e3430..07d9414268f1 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -4354,32 +4354,31 @@ static bool __io_poll_remove_one(struct io_kiocb *req,
 		do_complete = true;
 	}
 	spin_unlock(&poll->head->lock);
+	hash_del(&req->hash_node);
 	return do_complete;
 }
 
 static bool io_poll_remove_one(struct io_kiocb *req)
 {
-	struct async_poll *apoll = NULL;
 	bool do_complete;
 
 	if (req->opcode == IORING_OP_POLL_ADD) {
 		do_complete = __io_poll_remove_one(req, &req->poll);
 	} else {
-		apoll = req->apoll;
+		struct async_poll *apoll = req->apoll;
+
 		/* non-poll requests have submit ref still */
-		do_complete = __io_poll_remove_one(req, &req->apoll->poll);
-		if (do_complete)
+		do_complete = __io_poll_remove_one(req, &apoll->poll);
+		if (do_complete) {
 			io_put_req(req);
-	}
-
-	hash_del(&req->hash_node);
-
-	if (do_complete && apoll) {
-		/*
-		 * restore ->work because we need to call io_req_work_drop_env.
-		 */
-		memcpy(&req->work, &apoll->work, sizeof(req->work));
-		kfree(apoll);
+			/*
+			 * restore ->work because we will call
+			 * io_req_work_drop_env below when dropping the
+			 * final reference.
+			 */
+			memcpy(&req->work, &apoll->work, sizeof(req->work));
+			kfree(apoll);
+		}
 	}
 
 	if (do_complete) {
-- 
2.25.1