dm cache: fix writethrough mode quiescing in cache_map
Commit 2ee57d58 ("dm cache: add passthrough mode") inadvertently removed the deferred set reference that was taken in cache_map()'s writethrough mode support. Restore taking this reference. This issue was found with code inspection. Signed-off-by:Mike Snitzer <snitzer@redhat.com> Acked-by:
Joe Thornber <ejt@redhat.com> Cc: stable@vger.kernel.org # 3.13+
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fbcde3d8
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