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authorJens Axboe <axboe@kernel.dk>2023-03-27 19:56:18 -0600
committerJens Axboe <axboe@kernel.dk>2023-03-28 07:09:01 -0600
commit005308f7bdacf5685ed1a431244a183dbbb9e0e8 (patch)
treeda80bb93629ab5e4c2063313002e20f633fa2d99 /io_uring
parent02a4d923e4400a36d340ea12d8058f69ebf3a383 (diff)
io_uring/poll: clear single/double poll flags on poll arming
Unless we have at least one entry queued, then don't call into io_poll_remove_entries(). Normally this isn't possible, but if we retry poll then we can have ->nr_entries cleared again as we're setting it up. If this happens for a poll retry, then we'll still have at least REQ_F_SINGLE_POLL set. io_poll_remove_entries() then thinks it has entries to remove. Clear REQ_F_SINGLE_POLL and REQ_F_DOUBLE_POLL unconditionally when arming a poll request. Fixes: c16bda37594f ("io_uring/poll: allow some retries for poll triggering spuriously") Cc: stable@vger.kernel.org Reported-by: Pengfei Xu <pengfei.xu@intel.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'io_uring')
-rw-r--r--io_uring/poll.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/io_uring/poll.c b/io_uring/poll.c
index 795facbd0e9f..55306e801081 100644
--- a/io_uring/poll.c
+++ b/io_uring/poll.c
@@ -726,6 +726,7 @@ int io_arm_poll_handler(struct io_kiocb *req, unsigned issue_flags)
apoll = io_req_alloc_apoll(req, issue_flags);
if (!apoll)
return IO_APOLL_ABORTED;
+ req->flags &= ~(REQ_F_SINGLE_POLL | REQ_F_DOUBLE_POLL);
req->flags |= REQ_F_POLLED;
ipt.pt._qproc = io_async_queue_proc;