io_uring: clear req->result always before issuing a read/write request

req->result is cleared when io_issue_sqe() calls io_read/write_pre()
routines.  Those routines however are not called when the sqe
argument is NULL, which is the case when io_issue_sqe() is called from
io_wq_submit_work().  io_issue_sqe() may then examine a stale result if
a polled request had previously failed with -EAGAIN:

        if (ctx->flags & IORING_SETUP_IOPOLL) {
                if (req->result == -EAGAIN)
                        return -EAGAIN;

                io_iopoll_req_issued(req);
        }

and in turn cause a subsequently completed request to be re-issued in
io_wq_submit_work().

Signed-off-by: Bijan Mottahedeh <bijan.mottahedeh@oracle.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/fs/io_uring.c b/fs/io_uring.c
index e32268c..3130ed1 100644 (file)
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -1843,6 +1843,7 @@ static int io_read(struct io_kiocb *req, struct io_kiocb **nxt,
        if (!force_nonblock)
                req->rw.kiocb.ki_flags &= ~IOCB_NOWAIT;
 
+       req->result = 0;
        io_size = ret;
        if (req->flags & REQ_F_LINK)
                req->result = io_size;
@@ -1930,6 +1931,7 @@ static int io_write(struct io_kiocb *req, struct io_kiocb **nxt,
        if (!force_nonblock)
                req->rw.kiocb.ki_flags &= ~IOCB_NOWAIT;
 
+       req->result = 0;
        io_size = ret;
        if (req->flags & REQ_F_LINK)
                req->result = io_size;