thermal: Fix hotplug race condition leading to memory corruption.

msm_thermal module made a copy of the CPUFreq policy structure
pointer but continues to try and use it after the core has been
hotplugged (and the original structure is freed). The fix is to
use cpufreq_cpu_get/put instead of copying cpufreq pointers.

CRs-fixed: 342351
Change-Id: I312d8bccc09a5df5805f99fecdc9409d9d4ed2be
Signed-off-by: Eugene Seah <eseah@codeaurora.org>
msm_thermal: Remove error messages from log when core is offline

If msm_thermal is not cancelled and TSENS reports a high temperature,
it might try to limit the frequency, but since the core is offline,
the frequency limit may not happen. We need not report this error.

Change-Id: I579e2329c6fb038d53f2d207a6a832185e633785
Signed-off-by: Praveen Chidambaram <pchidamb@codeaurora.org>
cpufreq : Fix crash input event handler on governor switch

When an input event and CPU1 hotplug occurs at the same
time, a race condition can happen between cpufreq and
cpu hotplug resulting in a kernel panic.
When a hotplug operation is underway on CPU1,
__cpufreq_remove_dev is called. __cpufreq_remove_dev gets
the lock, proceeds to free the policy info of the current
governor and calls the ondemand governor with a STOP event.
If an input event occurs around the same time, it waits
for __cpufreq_remove_dev to release the lock. Meanwhile,
the ondemand governor clears some of its settings, but
fails to clear its local current policy. As soon as the
input event handler acquires the lock, it now uses the
invalid ondemand current policy handle to make frequency
changes. This results in a kernel panic.

Skip making frequency changes if this condition happens.

CRs-fixed: 327622,319348
Change-Id: I78227352fc66cc3ec5ab095c45eda76a92d1ba46
Signed-off-by: Anitha Anand <anithas@codeaurora.org>
cpufreq: interactive: fix possible Division by zero.

The following dump was seen sometimes while resuming,
the only division by zero on this function can happen after
delta_time is reassigned, since at the start of the
function, there is jump that protects against values
less than 1000.

After that, If delta_time and delta_idle == 0,
we will hit a div 0

Division by zero in kernel.
Backtrace:
[<c0057184>] (dump_backtrace+0x0/0x110) from [<c05d5ecc>] (dump_stack+0x18/0x1c)
r6:010f3000 r5:c113dfb0 r4:c004afb0 r3:c6ff0000
[<c05d5eb4>] (dump_stack+0x0/0x1c) from [<c00572cc>] (__div0+0x1c/0x20)
[<c00572b0>] (__div0+0x0/0x20) from [<c02195d4>] (Ldiv0+0x8/0x10)
[<c03dfd64>] (cpufreq_interactive_timer+0x0/0x2c0) from [<c00a7efc>] (run_timer_softirq+0x154/0x260)
[<c00a7da8>] (run_timer_softirq+0x0/0x260) from [<c00a0c8c>] (__do_softirq+0xc8/0x194)
[<c00a0bc4>] (__do_softirq+0x0/0x194) from [<c00a1008>] (irq_exit+0xb4/0xb8)
[<c00a0f54>] (irq_exit+0x0/0xb8) from [<c00584b4>] (ipi_timer+0x44/0x48)
r4:c004a040 r3:00000001
[<c0058470>] (ipi_timer+0x0/0x48) from [<c004c3e4>] (do_local_timer+0x68/0x84)
r5:c004ae2c r4:c07991e8
[<c004c37c>] (do_local_timer+0x0/0x84) from [<c0052948>] (__irq_svc+0x48/0xe0)

Change-Id: I639882db67b8d711c5710778ebc212f0f6a998e3

Acked-by: Nishanth Menon <nm@ti.com>
Signed-off-by: Axel Haslam <axelhaslam@ti.com>
cpufreq: interactive governor: default timer 10ms, maxspeed load 95%

Modify default timer from 30ms to 10ms, sampling 2 jiffies after
idle exit on ARM as in Honeycomb.

Modify default go_maxspeed_load from 85% loaded to 95% loaded, for
use in phones where power savings is more important (tablets may be
best served overriding this).

Change-Id: I3361a6279979bfae1df5262666a2e30ea7a44328
Signed-off-by: Todd Poynor <toddpoynor@google.com>
power: cpufreq interactive governor: use default sample time 20ms

Lower the default time at which a higher speed is allowed to run
before lowering based on lower CPU load from 80ms to 20ms.  Most
Android devices should trade power for performance here,
although tablets and non-battery-powered devices may want to
override this default.

Change-Id: I1a4f7faeca12793c51d5b92db30a63cca8d4f1be
Signed-off-by: Todd Poynor <toddpoynor@google.com>