From 4ebc1c61d6185604c97fd0b0355ab668052044ab Mon Sep 17 00:00:00 2001
From: Tejun Heo <tj@kernel.org>
Date: Tue, 18 Aug 2015 14:54:57 -0700
Subject: [PATCH] cfq-iosched: simplify control flow in cfq_get_queue()

cfq_get_queue()'s control flow looks like the following.

	async_cfqq = NULL;
	cfqq = NULL;

	if (!is_sync) {
		...
		async_cfqq = ...;
		cfqq = *async_cfqq;
	}

	if (!cfqq)
		cfqq = ...;

	if (!is_sync && !(*async_cfqq))
		...;

The only thing the local variable init, the second if, and the
async_cfqq test in the third if achieves is to skip cfqq creation and
installation if *async_cfqq was already non-NULL.  This is needlessly
complicated with different tests examining the same condition.
Simplify it to the following.

	if (!is_sync) {
		...
		async_cfqq = ...;
		cfqq = *async_cfqq;
		if (cfqq)
			goto out;
	}

	cfqq = ...;

	if (!is_sync)
		...;
 out:

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Jeff Moyer <jmoyer@redhat.com>
Cc: Vivek Goyal <vgoyal@redhat.com>
Cc: Arianna Avanzini <avanzini.arianna@gmail.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
---
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