[SRU][Trusty][PATCH 0/1] block: fix module reference leak on put_disk() call for cgroups throttle

[Joseph Salisbury]

BugLink: http://bugs.launchpad.net/bugs/1683976

== SRU Justification ==
Due to this bug, the module reference count will leak whenever you write to
/sys/fs/cgroup/blkio/blkio.throttle.*  There is a script in the bug report
to reproduce the bug.

Commit 39a169b62b41 resolves this bug and was added to mainline in
v4.5-rc5.  However, it was not cc'd to stable.

This commit is also needed in Xenial, but Xenial is a clean pick where Trusty needs
a minor backport.  The Xenial SRU will be sent separately.

== Fix ==
commit 39a169b62b415390398291080dafe63aec751e0a
Author: Roman Pen <roman.penyaev at profitbricks.com>
Date:   Tue Feb 9 12:33:35 2016 -0700

    block: fix module reference leak on put_disk() call for cgroups throttle

== Test Case ==
A test kernel was built with this patch and tested by the original bug reporter.
The bug reporter states the test kernel resolved the bug.

Roman Pen (1):
  block: fix module reference leak on put_disk() call for cgroups
    throttle

 block/blk-cgroup.c | 9 +++++++++
 1 file changed, 9 insertions(+)

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2.7.4