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io_uring: make sqpoll wakeup possible with getevents 

The way the logic is setup in io_uring_enter() means that you can't wake
up the SQ poller thread while at the same time waiting (or polling) for
completions afterwards. There's no reason for that to be the case.

Reported-by: Lewis Baker <lbaker@fb.com>
Reviewed-by: Jeff Moyer <jmoyer@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2019-09-12 14:19:16 -06:00
parent 6d5d5ac522
commit b2a9eadab8
1 changed files with 2 additions and 6 deletions
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8
fs/io_uring.c
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@ -3356,15 +3356,12 @@ SYSCALL_DEFINE6(io_uring_enter, unsigned int, fd, u32, to_submit,
* Just return the requested submit count, and wake the thread if
* we were asked to.
*/
ret = 0;
if (ctx->flags & IORING_SETUP_SQPOLL) {
if (flags & IORING_ENTER_SQ_WAKEUP)
wake_up(&ctx->sqo_wait);
submitted = to_submit;
goto out_ctx;
}
ret = 0;
if (to_submit) {
} else if (to_submit) {
bool block_for_last = false;
to_submit = min(to_submit, ctx->sq_entries);
@ -3394,7 +3391,6 @@ SYSCALL_DEFINE6(io_uring_enter, unsigned int, fd, u32, to_submit,
}
}
out_ctx:
io_ring_drop_ctx_refs(ctx, 1);
out_fput:
fdput(f);