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Message-ID: <20130729225519.20863.61030.stgit@srivatsabhat.in.ibm.com>
Date: Tue, 30 Jul 2013 04:25:25 +0530
From: "Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
To: rjw@...k.pl, viresh.kumar@...aro.org, toralf.foerster@....de,
robert.jarzmik@...el.com, durgadoss.r@...el.com,
tianyu.lan@...el.com, lantianyu1986@...il.com,
dirk.brandewie@...il.com
Cc: stern@...land.harvard.edu, srivatsa.bhat@...ux.vnet.ibm.com,
linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2 7/7] cpufreq: Perform light-weight init/teardown during
suspend/resume
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@...ux.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 4c5ad4a..170d344 100644
--- a/drivers/cpufreq/cpufreq.c
+++ b/drivers/cpufreq/cpufreq.c
@@ -2028,22 +2028,26 @@ static int 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 bc73be2..cb38413 100644
--- a/drivers/cpufreq/cpufreq_stats.c
+++ b/drivers/cpufreq/cpufreq_stats.c
@@ -349,11 +349,9 @@ static int 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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