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Subject[PATCH 3/3] cpufreq: Set policy to non-NULL only after all hotplug online work is done
Date
The existing code sets the per CPU policy to a non-NULL value before all
the steps performed during the hotplug online path is done. Specifically,
this is done before the policy min/max, governors, etc are initialized for
the policy. This in turn means that calls to cpufreq_cpu_get() return a
non-NULL policy before the policy/CPU is ready to be used.

To fix this, move the update of per CPU policy to a valid value after all
the initialization steps for the policy are completed.

Example kernel panic without this fix:
[ 512.146185] Unable to handle kernel NULL pointer dereference at virtual address 00000020
[ 512.146195] pgd = c0003000
[ 512.146213] [00000020] *pgd=80000000004003, *pmd=00000000
[ 512.146228] Internal error: Oops: 206 [#1] PREEMPT SMP ARM
<snip>
[ 512.146297] PC is at __cpufreq_governor+0x10/0x1ac
[ 512.146312] LR is at cpufreq_update_policy+0x114/0x150
<snip>
[ 512.149740] ---[ end trace f23a8defea6cd706 ]---
[ 512.149761] Kernel panic - not syncing: Fatal exception
[ 513.152016] CPU0: stopping
[ 513.154710] CPU: 0 PID: 7136 Comm: mpdecision Tainted: G D W 3.10.0-gd727407-00074-g979ede8 #396
<snip>
[ 513.317224] [<c0afe180>] (notifier_call_chain+0x40/0x68) from [<c02a23ac>] (__blocking_notifier_call_chain+0x40/0x58)
[ 513.327809] [<c02a23ac>] (__blocking_notifier_call_chain+0x40/0x58) from [<c02a23d8>] (blocking_notifier_call_chain+0x14/0x1c)
[ 513.339182] [<c02a23d8>] (blocking_notifier_call_chain+0x14/0x1c) from [<c0803c68>] (cpufreq_set_policy+0xd4/0x2b8)
[ 513.349594] [<c0803c68>] (cpufreq_set_policy+0xd4/0x2b8) from [<c0803e7c>] (cpufreq_init_policy+0x30/0x98)
[ 513.359231] [<c0803e7c>] (cpufreq_init_policy+0x30/0x98) from [<c0805a18>] (__cpufreq_add_dev.isra.17+0x4dc/0x7a4)
[ 513.369560] [<c0805a18>] (__cpufreq_add_dev.isra.17+0x4dc/0x7a4) from [<c0805d38>] (cpufreq_cpu_callback+0x58/0x84)
[ 513.379978] [<c0805d38>] (cpufreq_cpu_callback+0x58/0x84) from [<c0afe180>] (notifier_call_chain+0x40/0x68)
[ 513.389704] [<c0afe180>] (notifier_call_chain+0x40/0x68) from [<c02812dc>] (__cpu_notify+0x28/0x44)
[ 513.398728] [<c02812dc>] (__cpu_notify+0x28/0x44) from [<c0aeed90>] (_cpu_up+0xf4/0x1dc)
[ 513.406797] [<c0aeed90>] (_cpu_up+0xf4/0x1dc) from [<c0aeeed4>] (cpu_up+0x5c/0x78)
[ 513.414357] [<c0aeeed4>] (cpu_up+0x5c/0x78) from [<c0aec808>] (store_online+0x44/0x74)
[ 513.422253] [<c0aec808>] (store_online+0x44/0x74) from [<c03a40f4>] (sysfs_write_file+0x108/0x14c)
[ 513.431195] [<c03a40f4>] (sysfs_write_file+0x108/0x14c) from [<c03517d4>] (vfs_write+0xd0/0x180)
[ 513.439958] [<c03517d4>] (vfs_write+0xd0/0x180) from [<c0351ca8>] (SyS_write+0x38/0x68)
[ 513.447947] [<c0351ca8>] (SyS_write+0x38/0x68) from [<c0205de0>] (ret_fast_syscall+0x0/0x30)

In this specific case, thread A set's CPU1's policy->governor in
cpufreq_init_policy() to NULL while thread B is using the policy->governor in
__cpufreq_governor().

Change-Id: I0f6f4e51ac3b7127a1ea56a1cb8e7ae1bcf8d6b6
Signed-off-by: Saravana Kannan <skannan@codeaurora.org>
---
drivers/cpufreq/cpufreq.c | 52 ++++++++++++++++++++++++++++-------------------
1 file changed, 31 insertions(+), 21 deletions(-)

diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
index cb003a6..5caefa9 100644
--- a/drivers/cpufreq/cpufreq.c
+++ b/drivers/cpufreq/cpufreq.c
@@ -849,7 +849,7 @@ static int cpufreq_add_dev_interface(struct cpufreq_policy *policy,
goto err_out_kobj_put;
drv_attr++;
}
- if (cpufreq_driver->get) {
+ if (cpufreq_driver->get || policy->clk) {
ret = sysfs_create_file(&policy->kobj, &cpuinfo_cur_freq.attr);
if (ret)
goto err_out_kobj_put;
@@ -877,6 +877,22 @@ err_out_kobj_put:
return ret;
}

+static unsigned int __cpufreq_get_freq(struct cpufreq_policy *policy)
+{
+ unsigned long freq;
+
+ if (policy->clk) {
+ freq = clk_get_rate(policy->clk);
+ if(!IS_ERR_VALUE(freq))
+ return freq / 1000;
+ }
+
+ if (cpufreq_driver->get)
+ return cpufreq_driver->get(policy->cpu);
+
+ return 0;
+}
+
static void cpufreq_init_policy(struct cpufreq_policy *policy)
{
struct cpufreq_policy new_policy;
@@ -1109,17 +1125,10 @@ static int __cpufreq_add_dev(struct device *dev, struct subsys_interface *sif,
goto err_set_policy_cpu;
}

- write_lock_irqsave(&cpufreq_driver_lock, flags);
- for_each_cpu(j, policy->cpus)
- per_cpu(cpufreq_cpu_data, j) = policy;
- write_unlock_irqrestore(&cpufreq_driver_lock, flags);
-
- if (cpufreq_driver->get) {
- policy->cur = cpufreq_driver->get(policy->cpu);
- if (!policy->cur) {
- pr_err("%s: ->get() failed\n", __func__);
- goto err_get_freq;
- }
+ policy->cur = __cpufreq_get_freq(policy);
+ if (!policy->cur) {
+ pr_err("%s: get freq failed\n", __func__);
+ goto err_get_freq;
}

/*
@@ -1207,6 +1216,11 @@ static int __cpufreq_add_dev(struct device *dev, struct subsys_interface *sif,
policy->user_policy.governor = policy->governor;
}

+ write_lock_irqsave(&cpufreq_driver_lock, flags);
+ for_each_cpu(j, policy->cpus)
+ per_cpu(cpufreq_cpu_data, j) = policy;
+ write_unlock_irqrestore(&cpufreq_driver_lock, flags);
+
kobject_uevent(&policy->kobj, KOBJ_ADD);
up_read(&cpufreq_rwsem);

@@ -1216,11 +1230,6 @@ static int __cpufreq_add_dev(struct device *dev, struct subsys_interface *sif,

err_out_unregister:
err_get_freq:
- write_lock_irqsave(&cpufreq_driver_lock, flags);
- for_each_cpu(j, policy->cpus)
- per_cpu(cpufreq_cpu_data, j) = NULL;
- write_unlock_irqrestore(&cpufreq_driver_lock, flags);
-
if (cpufreq_driver->exit)
cpufreq_driver->exit(policy);
err_set_policy_cpu:
@@ -1482,6 +1491,8 @@ unsigned int cpufreq_quick_get(unsigned int cpu)
struct cpufreq_policy *policy;
unsigned int ret_freq = 0;

+ /* What's up with the setpolicy check? Why the call to get only for
+ * arch's that implement setpolicy? */
if (cpufreq_driver && cpufreq_driver->setpolicy && cpufreq_driver->get)
return cpufreq_driver->get(cpu);

@@ -1520,11 +1531,10 @@ static unsigned int __cpufreq_get(unsigned int cpu)
struct cpufreq_policy *policy = per_cpu(cpufreq_cpu_data, cpu);
unsigned int ret_freq = 0;

- if (!cpufreq_driver->get)
+ ret_freq = __cpufreq_get_freq(policy);
+ if (!ret_freq)
return ret_freq;

- ret_freq = cpufreq_driver->get(cpu);
-
if (ret_freq && policy->cur &&
!(cpufreq_driver->flags & CPUFREQ_CONST_LOOPS)) {
/* verify no discrepancy between actual and
@@ -2148,7 +2158,7 @@ int cpufreq_update_policy(unsigned int cpu)
* BIOS might change freq behind our back
* -> ask driver for current freq and notify governors about a change
*/
- if (cpufreq_driver->get) {
+ if (cpufreq_driver->get || policy->clk) {
new_policy.cur = cpufreq_driver->get(cpu);
if (!policy->cur) {
pr_debug("Driver did not initialize current freq");
--
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