Commit 63e5d81f authored Feb 07, 2020 by Stefano Garzarella Committed by Jens Axboe Feb 08, 2020

io_uring: flush overflowed CQ events in the io_uring_poll()



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>

parent cf3040ca

fs/io_uring.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -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;

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