io_uring: remove extra check in __io_commit_cqring

to #26323588

commit 0791015837f1520dd72918355dcb1f1e79175255 upstream.

__io_commit_cqring() is almost always called when there is a change in
the rings, so the check is rather pessimising.
Signed-off-by: NPavel Begunkov <asml.silence@gmail.com>
Signed-off-by: NJens Axboe <axboe@kernel.dk>
Signed-off-by: NJoseph Qi <joseph.qi@linux.alibaba.com>
Acked-by: NXiaoguang Wang <xiaoguang.wang@linux.alibaba.com>

fs/io_uring.c

@@ -860,7 +860,6 @@ static void __io_commit_cqring(struct io_ring_ctx *ctx)
 {
 	struct io_rings *rings = ctx->rings;
 
-	if (ctx->cached_cq_tail != READ_ONCE(rings->cq.tail)) {
 	/* order cqe stores with ring update */
 	smp_store_release(&rings->cq.tail, ctx->cached_cq_tail);
 
@@ -868,7 +867,6 @@ static void __io_commit_cqring(struct io_ring_ctx *ctx)
 		wake_up_interruptible(&ctx->cq_wait);
 		kill_fasync(&ctx->cq_fasync, SIGIO, POLL_IN);
 	}
-	}
 }
 
 static inline bool io_prep_async_work(struct io_kiocb *req,