Messages in this thread Patch in this message | | | From | "Srivatsa S. Bhat" <> | Subject | [PATCH 8/8] cpufreq: Perform light-weight init/teardown during suspend/resume | Date | Fri, 12 Jul 2013 03:47:19 +0530 |
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Now that we have the infrastructure to perform a light-weight init/tear-down, use that in the cpufreq CPU hotplug notifier when invoked from the suspend/resume path.
This also ensures that the file permissions of the cpufreq sysfs files are preserved across suspend/resume, something which commit a66b2e (cpufreq: Preserve sysfs files across suspend/resume) originally intended to do, but had to be reverted due to other problems.
Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com> ---
drivers/cpufreq/cpufreq.c | 18 +++++++++++------- drivers/cpufreq/cpufreq_stats.c | 2 -- 2 files changed, 11 insertions(+), 9 deletions(-)
diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c index 15ced5f..c7f59e8 100644 --- a/drivers/cpufreq/cpufreq.c +++ b/drivers/cpufreq/cpufreq.c @@ -2030,22 +2030,26 @@ static int __cpuinit cpufreq_cpu_callback(struct notifier_block *nfb, { unsigned int cpu = (unsigned long)hcpu; struct device *dev; + bool frozen = false; dev = get_cpu_device(cpu); if (dev) { - switch (action) { + + if (action & CPU_TASKS_FROZEN) + frozen = true; + + switch (action & ~CPU_TASKS_FROZEN) { case CPU_ONLINE: - case CPU_ONLINE_FROZEN: - cpufreq_add_dev(dev, NULL); + __cpufreq_add_dev(dev, NULL, frozen); cpufreq_update_policy(cpu); break; + case CPU_DOWN_PREPARE: - case CPU_DOWN_PREPARE_FROZEN: - __cpufreq_remove_dev(dev, NULL, false); + __cpufreq_remove_dev(dev, NULL, frozen); break; + case CPU_DOWN_FAILED: - case CPU_DOWN_FAILED_FROZEN: - cpufreq_add_dev(dev, NULL); + __cpufreq_add_dev(dev, NULL, frozen); break; } } diff --git a/drivers/cpufreq/cpufreq_stats.c b/drivers/cpufreq/cpufreq_stats.c index a3e7475..4e1eb3f 100644 --- a/drivers/cpufreq/cpufreq_stats.c +++ b/drivers/cpufreq/cpufreq_stats.c @@ -349,11 +349,9 @@ static int __cpuinit cpufreq_stat_cpu_callback(struct notifier_block *nfb, switch (action) { case CPU_DOWN_PREPARE: - case CPU_DOWN_PREPARE_FROZEN: cpufreq_stats_free_sysfs(cpu); break; case CPU_DEAD: - case CPU_DEAD_FROZEN: cpufreq_stats_free_table(cpu); break; }
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