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io_uring: fix poll full SQ detection 

io_uring_poll shouldn't signal EPOLLOUT | EPOLLWRNORM if the queue is
full; the old check would always signal EPOLLOUT | EPOLLWRNORM (unless
there were U32_MAX - 1 entries in the SQ queue).

Signed-off-by: Stefan Bühler <source@stbuehler.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
hifive-unleashed-5.1
Stefan Bühler 2019-04-19 11:57:46 +02:00 committed by Jens Axboe
parent 0d7bae69c5
commit fb775faa9e
1 changed files with 2 additions and 1 deletions
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3
fs/io_uring.c
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@ -2576,7 +2576,8 @@ static __poll_t io_uring_poll(struct file *file, poll_table *wait)
poll_wait(file, &ctx->cq_wait, wait);
/* See comment at the top of this file */
smp_rmb();
if (READ_ONCE(ctx->sq_ring->r.tail) + 1 != ctx->cached_sq_head)
if (READ_ONCE(ctx->sq_ring->r.tail) - ctx->cached_sq_head !=
ctx->sq_ring->ring_entries)
mask |= EPOLLOUT | EPOLLWRNORM;
if (READ_ONCE(ctx->cq_ring->r.head) != ctx->cached_cq_tail)
mask |= EPOLLIN | EPOLLRDNORM;