If read multishot is being invoked from the poll retry handler, then we
should return IOU_ISSUE_SKIP_COMPLETE rather than -EAGAIN. If not, then
a CQE will be posted with -EAGAIN rather than triggering the retry when
the file is flagged as readable again.
Cc: stable@xxxxxxxxxxxxxxx
Reported-by: Sargun Dhillon <sargun@xxxxxxxx>
Fixes: fc68fcda04910 ("io_uring/rw: add support for IORING_OP_READ_MULTISHOT")
Signed-off-by: Jens Axboe <axboe@xxxxxxxxx>
---
diff --git a/io_uring/rw.c b/io_uring/rw.c
index 47e097ab5d7e..0585ebcc9773 100644
--- a/io_uring/rw.c
+++ b/io_uring/rw.c
@@ -947,6 +947,8 @@ int io_read_mshot(struct io_kiocb *req, unsigned int issue_flags)
*/
if (io_kbuf_recycle(req, issue_flags))
rw->len = 0;
+ if (issue_flags & IO_URING_F_MULTISHOT)
+ return IOU_ISSUE_SKIP_COMPLETE;
return -EAGAIN;
}
--
Jens Axboe
