linux-kernel - [PATCH 5.14 115/162] io_uring: dont punt files update to io-wq unconditionally

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Date:   Mon, 27 Sep 2021 19:02:41 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Jens Axboe <axboe@...nel.dk>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.14 115/162] io_uring: dont punt files update to io-wq unconditionally

From: Jens Axboe <axboe@...nel.dk>

[ Upstream commit cdb31c29d397a8076d81fd1458d091c647ef94ba ]

There's no reason to punt it unconditionally, we just need to ensure that
the submit lock grabbing is conditional.

Fixes: 05f3fb3c5397 ("io_uring: avoid ring quiesce for fixed file set unregister and update")
Signed-off-by: Jens Axboe <axboe@...nel.dk>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 fs/io_uring.c | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/fs/io_uring.c b/fs/io_uring.c
index 187eb1907bde..699a08d724c2 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -5919,19 +5919,16 @@ static int io_files_update(struct io_kiocb *req, unsigned int issue_flags)
 	struct io_uring_rsrc_update2 up;
 	int ret;
 
-	if (issue_flags & IO_URING_F_NONBLOCK)
-		return -EAGAIN;
-
 	up.offset = req->rsrc_update.offset;
 	up.data = req->rsrc_update.arg;
 	up.nr = 0;
 	up.tags = 0;
 	up.resv = 0;
 
-	mutex_lock(&ctx->uring_lock);
+	io_ring_submit_lock(ctx, !(issue_flags & IO_URING_F_NONBLOCK));
 	ret = __io_register_rsrc_update(ctx, IORING_RSRC_FILE,
 					&up, req->rsrc_update.nr_args);
-	mutex_unlock(&ctx->uring_lock);
+	io_ring_submit_unlock(ctx, !(issue_flags & IO_URING_F_NONBLOCK));
 
 	if (ret < 0)
 		req_set_fail(req);
-- 
2.33.0