From: Stefano Garzarella sgarzare@redhat.com
[ Upstream commit 63e5d81f72af1bf370bf8a6745b0a8d71a7bb37d ]
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 Signed-off-by: Sasha Levin sashal@kernel.org --- fs/io_uring.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/fs/io_uring.c b/fs/io_uring.c index 678c62782ba3b..de4bd647cd1df 100644 --- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -4970,7 +4970,7 @@ 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;