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io_uring: change arm poll return values 

The rules for __io_arm_poll_handler()'s result parsing are complicated,
as the first step don't pass return a mask but pass back a positive
return code and fill ipt->result_mask.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/529e29e9f97f2e6e383ccd44234d8b576a83a921.1655990418.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2022-06-23 14:24:47 +01:00 committed by Jens Axboe
parent 5204aa8c43
commit 063a007996
1 changed files with 5 additions and 2 deletions
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7
io_uring/poll.c
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@ -34,6 +34,8 @@ struct io_poll_table {
struct io_kiocb *req;
int nr_entries;
int error;
/* output value, set only if arm poll returns >0 */
__poll_t result_mask;
};
#define IO_POLL_CANCEL_FLAG BIT(31)
@ -462,8 +464,9 @@ static int __io_arm_poll_handler(struct io_kiocb *req,
if (mask &&
((poll->events & (EPOLLET|EPOLLONESHOT)) == (EPOLLET|EPOLLONESHOT))) {
io_poll_remove_entries(req);
ipt->result_mask = mask;
/* no one else has access to the req, forget about the ref */
return mask;
return 1;
}
if (!mask && unlikely(ipt->error || !ipt->nr_entries)) {
@ -813,7 +816,7 @@ int io_poll_add(struct io_kiocb *req, unsigned int issue_flags)
ret = __io_arm_poll_handler(req, poll, &ipt, poll->events);
if (ret) {
io_req_set_res(req, ret, 0);
io_req_set_res(req, ipt.result_mask, 0);
return IOU_OK;
}
if (ipt.error) {