io_uring: simplify io_rw_prep_async()

Don't touch iter->iov and iov in between __io_import_iovec() and
io_req_map_rw(), the former function aleady sets it correctly, because it
creates one more case with NULL'ed iov to consider in io_req_map_rw().

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/fs/io_uring.c b/fs/io_uring.c
index 3ee6ee1..6d8c2dc 100644 (file)
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -3065,16 +3065,14 @@ static inline int io_rw_prep_async(struct io_kiocb *req, int rw,
                                   bool force_nonblock)
 {
        struct io_async_rw *iorw = &req->io->rw;
-       struct iovec *iov;
+       struct iovec *iov = iorw->fast_iov;
        ssize_t ret;
 
-       iorw->iter.iov = iov = iorw->fast_iov;
        ret = __io_import_iovec(rw, req, &iov, &iorw->iter, !force_nonblock);
        if (unlikely(ret < 0))
                return ret;
 
-       iorw->iter.iov = iov;
-       io_req_map_rw(req, iorw->iter.iov, iorw->fast_iov, &iorw->iter);
+       io_req_map_rw(req, iov, iorw->fast_iov, &iorw->iter);
        return 0;
 }