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io_uring: flush overflowed CQ events in the io_uring_poll()

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In io_uring_poll() we must flush overflowed CQ events before to
check if there are CQ events available, to avoid missing events.

We call the io_cqring_events() that checks and flushes any overflow
and returns the number of CQ events available.

Signed-off-by: Stefano Garzarella <sgarzare@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Stefano Garzarella 2020-02-07 13:18:28 +01:00 committed by Jens Axboe
parent cf3040ca55
commit 63e5d81f72
1 changed files with 1 additions and 1 deletions
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2
fs/io_uring.c
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@ -6283,7 +6283,7 @@ static __poll_t io_uring_poll(struct file *file, poll_table *wait)
if (READ_ONCE(ctx->rings->sq.tail) - ctx->cached_sq_head !=
ctx->rings->sq_ring_entries)
mask |= EPOLLOUT | EPOLLWRNORM;
if (READ_ONCE(ctx->rings->cq.head) != ctx->cached_cq_tail)
if (io_cqring_events(ctx, false))
mask |= EPOLLIN | EPOLLRDNORM;
return mask;