From a664d0f05a2ec02c8f042db536d84d15d6e19e81 Mon Sep 17 00:00:00 2001
From: Slava Pestov <sp@daterainc.com>
Date: Tue, 20 May 2014 12:20:28 -0700
Subject: [PATCH] bcache: fix crash on shutdown in passthrough mode

We never started the writeback thread in this case, so don't stop it.
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Reading git-format-patch failed