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io_uring: compare cached_cq_tail with cq.head in_io_uring_poll 

After 75b28af("io_uring: allocate the two rings together"), we compare
sq.head with cached_cq_tail to determine does there any cq invalid.
Actually, we should use cq.head.

Fixes: 75b28affdd ("io_uring: allocate the two rings together")
Signed-off-by: yangerkun <yangerkun@huawei.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
yangerkun 2019-09-24 20:53:34 +08:00 committed by Jens Axboe
parent 32960613b7
commit daa5de5415
1 changed files with 1 additions and 1 deletions
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2
fs/io_uring.c
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@ -3455,7 +3455,7 @@ static __poll_t io_uring_poll(struct file *file, poll_table *wait)
if (READ_ONCE(ctx->rings->sq.tail) - ctx->cached_sq_head != if (READ_ONCE(ctx->rings->sq.tail) - ctx->cached_sq_head !=
ctx->rings->sq_ring_entries) ctx->rings->sq_ring_entries)
mask |= EPOLLOUT | EPOLLWRNORM; mask |= EPOLLOUT | EPOLLWRNORM;
if (READ_ONCE(ctx->rings->sq.head) != ctx->cached_cq_tail) if (READ_ONCE(ctx->rings->cq.head) != ctx->cached_cq_tail)
mask |= EPOLLIN | EPOLLRDNORM; mask |= EPOLLIN | EPOLLRDNORM;
return mask; return mask;