[SRU][Bionic][PATCH 0/1] cpufreq: powernv: Fix hardlockup due to synchronous smp_call in timer interrupt

[Joseph Salisbury]

BugLink: http://bugs.launchpad.net/bugs/1768898

== SRU Justification ==
IBM reports that this bug occurs with stop4 which results in soft lockups/rcu stalls.
This is a kernel synchronization issue leading to a dead lock.

This bug was introduced by commit 7bc54b652f13 in v4.8-rc1.  This
regression is fixed by mainline commit c0f7f5b6c6910.

== Fix ==
c0f7f5b6c6910 ("cpufreq: powernv: Fix hardlockup due to synchronous smp_call in timer interrupt")

== Regression Potential ==
Low. Fixes current regression.  Cc'd to upstream stable, so it has had
additon upstream review. 

== 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.

Shilpasri G Bhat (1):
  cpufreq: powernv: Fix hardlockup due to synchronous smp_call in timer
    interrupt

 drivers/cpufreq/powernv-cpufreq.c | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

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2.7.4