linux-kernel - [PATCH 0/3] Cpufreq frequency serialization fixes

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Date:	Fri, 25 Apr 2014 13:47:58 +0530
From:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
To:	rjw@...ysocki.net, mroos@...ux.ee, viresh.kumar@...aro.org
Cc:	cpufreq@...r.kernel.org, linux-pm@...r.kernel.org,
	linux-kernel@...r.kernel.org, srivatsa.bhat@...ux.vnet.ibm.com
Subject: [PATCH 0/3] Cpufreq frequency serialization fixes

Hi,

Meelis Roos reported hangs during boot in the longhaul cpufreq driver, after
commit 12478cf0c55 (cpufreq: Make sure frequency transitions are serialized).
The root-cause of this issue is the extra invocation of the
cpufreq_freq_transition_begin() and cpufreq_freq_transition_end() APIs in the
longhaul driver. I found similar issues in the powernow-k6 and powernow-k7
drivers as well. This patchset fixes the issue in all the 3 drivers.

 Srivatsa S. Bhat (3):
      cpufreq, powernow-k7: Fix double invocation of cpufreq_freq_transition_begin/end
      cpufreq, powernow-k6: Fix double invocation of cpufreq_freq_transition_begin/end
      cpufreq, longhaul: Fix double invocation of cpufreq_freq_transition_begin/end

 drivers/cpufreq/longhaul.c    |   12 ++++++++----
 drivers/cpufreq/powernow-k6.c |   20 +++++++++++---------
 drivers/cpufreq/powernow-k7.c |    4 ----
 3 files changed, 19 insertions(+), 17 deletions(-)

Thanks,
Srivatsa S. Bhat
IBM Linux Technology Center

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