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From: Pavel Begunkov <[email protected]>
To: Jens Axboe <[email protected]>,
	[email protected], [email protected]
Subject: [PATCH 2/3] io_uring: check non-sync defer_list carefully
Date: Fri,  1 May 2020 17:09:37 +0300	[thread overview]
Message-ID: <c3224e56c1d1f97cf40e8dc1e03723b0dc4137cf.1588341674.git.asml.silence@gmail.com> (raw)
In-Reply-To: <[email protected]>

io_req_defer() do double-checked locking. Use proper helpers for that,
i.e. list_empty_careful().

Signed-off-by: Pavel Begunkov <[email protected]>
---
 fs/io_uring.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/io_uring.c b/fs/io_uring.c
index e7d7e83e3d56..e5d560f2ce12 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -5028,7 +5028,7 @@ static int io_req_defer(struct io_kiocb *req, const struct io_uring_sqe *sqe)
 	int ret;
 
 	/* Still need defer if there is pending req in defer list. */
-	if (!req_need_defer(req) && list_empty(&ctx->defer_list))
+	if (!req_need_defer(req) && list_empty_careful(&ctx->defer_list))
 		return 0;
 
 	if (!req->io && io_alloc_async_ctx(req))
-- 
2.24.0


  parent reply	other threads:[~2020-05-01 14:11 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-01 14:09 [PATCH 0/3] small fixes for-5.7 Pavel Begunkov
2020-05-01 14:09 ` [PATCH 1/3] io_uring: fix extra put in sync_file_range() Pavel Begunkov
2020-05-01 14:09 ` Pavel Begunkov [this message]
2020-05-01 14:09 ` [PATCH 3/3] io_uring: punt splice async because of inode mtx Pavel Begunkov
2020-05-01 15:05 ` [PATCH 0/3] small fixes for-5.7 Jens Axboe

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