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io_uring: remove extra nxt check after punt 

After __io_queue_sqe() ended up in io_queue_async_work(), it's already
known that there is no @nxt req, so skip the check and return from the
function.

Also, @nxt initialisation now can be done just before
io_put_req_find_next(), as there is no jumping until it's checked.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2020-02-29 22:48:24 +03:00 committed by Jens Axboe
parent d7718a9d25
commit 4bc4494ec7
1 changed files with 5 additions and 5 deletions
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10
fs/io_uring.c
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@ -4936,7 +4936,7 @@ static struct io_kiocb *io_prep_linked_timeout(struct io_kiocb *req)
static void __io_queue_sqe(struct io_kiocb *req, const struct io_uring_sqe *sqe)
{
struct io_kiocb *linked_timeout;
struct io_kiocb *nxt = NULL;
struct io_kiocb *nxt;
const struct cred *old_creds = NULL;
int ret;
@ -4963,7 +4963,7 @@ again:
if (io_arm_poll_handler(req)) {
if (linked_timeout)
io_queue_linked_timeout(linked_timeout);
goto done_req;
goto exit;
}
punt:
if (io_op_defs[req->opcode].file_table) {
@ -4977,10 +4977,11 @@ punt:
* submit reference when the iocb is actually submitted.
*/
io_queue_async_work(req);
goto done_req;
goto exit;
}
err:
nxt = NULL;
/* drop submission reference */
io_put_req_find_next(req, &nxt);
@ -4997,15 +4998,14 @@ err:
req_set_fail_links(req);
io_put_req(req);
}
done_req:
if (nxt) {
req = nxt;
nxt = NULL;
if (req->flags & REQ_F_FORCE_ASYNC)
goto punt;
goto again;
}
exit:
if (old_creds)
revert_creds(old_creds);
}