sched/fair: Fix unlocked reads of some cfs_b->quota/period

sched_cfs_period_timer() reads cfs_b->period without locks before calling
do_sched_cfs_period_timer(), and similarly unthrottle_offline_cfs_rqs()
would read cfs_b->period without the right lock. Thus a simultaneous
change of bandwidth could cause corruption on any platform where ktime_t
or u64 writes/reads are not atomic.

Extend cfs_b->lock from do_sched_cfs_period_timer() to include the read of
cfs_b->period to solve that issue; unthrottle_offline_cfs_rqs() can just
use 1 rather than the exact quota, much like distribute_cfs_runtime()
does.

There is also an unlocked read of cfs_b->runtime_expires, but a race
there would only delay runtime expiry by a tick. Still, the comparison
should just be != anyway, which clarifies even that problem.

Signed-off-by: Ben Segall <bsegall@google.com>
Tested-by: Roman Gushchin <klamm@yandex-team.ru>
[peterz: Fix compile warn]
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Cc: pjt@google.com
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Pranav Vashi <neobuddy89@gmail.com>
printk: Add printk_deferred_once

Two of the three prink_deferred uses are really printk_once style
uses, so add a printk_deferred_once macro to simplify those call
sites.

Signed-off-by: John Stultz <john.stultz@linaro.org>
Reviewed-by: Steven Rostedt <rostedt@goodmis.org>
Reviewed-by: Jan Kara <jack@suse.cz>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Jiri Bohac <jbohac@suse.cz>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Pranav Vashi <neobuddy89@gmail.com>
msm: mdss: refactor pipe retrieval

Allow only retrieval of pipes that are on particular framebuffer device
used list. This ensures that pipe is not modified from a different fb
device node and cause potential issues.

Signed-off-by: Adrian Salido-Moreno <adrianm@codeaurora.org>
Signed-off-by: Pranav Vashi <neobuddy89@gmail.com>
mdss: display: move mdss_mdp_irq_enable out of clk_lock scope

There are potential deadlock between irq handler and
mdss_mdp_irq_enable() since both can acquire mdss_lock
before trying to grab local lock. Add koff_lock for kickoff
related function in addition to original clk_lock which used
for clock related function to reduce unnecessary lock contention.

Signed-off-by: Kuogee Hsieh <khsieh@codeaurora.org>
Signed-off-by: Pranav Vashi <neobuddy89@gmail.com>
msm: mdss: Get framerate only if required

Signed-off-by: Pranav Vashi <neobuddy89@gmail.com>
msm8974: rfkill: Merge changes from LGE rfkill driver

* Merge changes of rfkill driver from android-msm-dory-3.10-kitkat-wear.
* Retained unbalanced irq fix.
* Thanks to myfluxi for heads up!

Signed-off-by: Pranav Vashi <neobuddy89@gmail.com>
drivers: bluetooth: Merge changes from LGE bluesleep driver

* This is basic cleanup adapted from android-msm-dory-3.10-kitkat-wear.
* Retained previous tweaks and fixes to bluesleep driver.
* Thanks to myfluxi for heads up!

Signed-off-by: Pranav Vashi <neobuddy89@gmail.com>