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05 April 2024, 19:05:47 UTC
Revision 797f3f535d59f05ad12c629338beef6cb801d19e authored by Bijan Mottahedeh on 16 January 2020, 02:37:45 UTC, committed by Jens Axboe on 16 January 2020, 04:36:13 UTC 
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>
1 parent 7891293
History
Tip revision: 797f3f535d59f05ad12c629338beef6cb801d19e authored by Bijan Mottahedeh on 16 January 2020, 02:37:45 UTC
io_uring: clear req->result always before issuing a read/write request
Tip revision: 797f3f5
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