]> git.proxmox.com Git - mirror_ubuntu-kernels.git/commit
io_uring: fix bad inflight accounting for SETUP_IOPOLL|SETUP_SQTHREAD
authorJens Axboe <axboe@kernel.dk>
Fri, 25 Oct 2019 16:06:15 +0000 (10:06 -0600)
committerJens Axboe <axboe@kernel.dk>
Fri, 25 Oct 2019 16:58:53 +0000 (10:58 -0600)
commit2b2ed9750fc9d040b9f6d076afcef6f00b6f1f7c
treee7688dd8e1ca4f2b2beabda1b9cc9d824724aa76
parent498ccd9eda49117c34e0041563d0da6ac40e52b8
io_uring: fix bad inflight accounting for SETUP_IOPOLL|SETUP_SQTHREAD

We currently assume that submissions from the sqthread are successful,
and if IO polling is enabled, we use that value for knowing how many
completions to look for. But if we overflowed the CQ ring or some
requests simply got errored and already completed, they won't be
available for polling.

For the case of IO polling and SQTHREAD usage, look at the pending
poll list. If it ever hits empty then we know that we don't have
anymore pollable requests inflight. For that case, simply reset
the inflight count to zero.

Reported-by: Pavel Begunkov <asml.silence@gmail.com>
Reviewed-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
fs/io_uring.c