Merge tag 'v3.12-pwm-cleanup-for-olof' of git://github.com/tom3q/linux into next/cleanup

From Tomasz Figa:
Here is the Samsung PWM cleanup series. Particular patches of the series
involve following modifications:
 - fixing up few things in samsung_pwm_timer clocksource driver,
 - moving remaining Samsung platforms to the new clocksource driver,
 - removing old clocksource driver,
 - adding new multiplatform- and DT-aware PWM driver,
 - moving all Samsung platforms to use the new PWM driver,
 - removing old PWM driver,
 - removing all PWM-related code that is not used anymore.

* tag 'v3.12-pwm-cleanup-for-olof' of git://github.com/tom3q/linux: (684 commits)
  ARM: SAMSUNG: Remove plat/regs-timer.h header
  ARM: SAMSUNG: Remove remaining uses of plat/regs-timer.h header
  ARM: SAMSUNG: Remove pwm-clock infrastructure
  ARM: SAMSUNG: Remove old PWM timer platform devices
  pwm: Remove superseded pwm-samsung-legacy driver
  ARM: SAMSUNG: Modify board files to use new PWM platform device
  ARM: SAMSUNG: Rework private data handling in dev-backlight
  pwm: Add new pwm-samsung driver
  pwm: samsung: Rename to pwm-samsung-legacy
  ARM: SAMSUNG: Remove unused PWM timer IRQ chip code
  ARM: SAMSUNG: Remove old samsung-time driver
  ARM: SAMSUNG: Move all platforms to new clocksource driver
  ARM: SAMSUNG: Set PWM platform data
  ARM: SAMSUNG: Add new PWM platform device
  ARM: SAMSUNG: Unify base address definitions of timer block
  clocksource: samsung_pwm_timer: Handle suspend/resume correctly
  clocksource: samsung_pwm_timer: Do not use clocksource_mmio
  clocksource: samsung_pwm_timer: Cache clocksource register address
  clocksource: samsung_pwm_timer: Correct definition of AUTORELOAD bit
  clocksource: samsung_pwm_timer: Do not request PWM mem region
  + v3.11-rc4

Conflicts:
	arch/arm/Kconfig.debug

Signed-off-by: Olof Johansson <olof@lixom.net>

1 files changed, 11 insertions, 0 deletions

diff --git a/kernel/power/process.c b/kernel/power/process.c
index fc0df8486449..06ec8869dbf1 100644
--- a/kernel/power/process.c
+++ b/kernel/power/process.c
@@ -109,6 +109,8 @@ static int try_to_freeze_tasks(bool user_only)
 
 /**
  * freeze_processes - Signal user space processes to enter the refrigerator.
+ * The current thread will not be frozen.  The same process that calls
+ * freeze_processes must later call thaw_processes.
  *
  * On success, returns 0.  On failure, -errno and system is fully thawed.
  */
@@ -120,6 +122,9 @@ int freeze_processes(void)
 	if (error)
 		return error;
 
+	/* Make sure this task doesn't get frozen */
+	current->flags |= PF_SUSPEND_TASK;
+
 	if (!pm_freezing)
 		atomic_inc(&system_freezing_cnt);
 
@@ -168,6 +173,7 @@ int freeze_kernel_threads(void)
 void thaw_processes(void)
 {
 	struct task_struct *g, *p;
+	struct task_struct *curr = current;
 
 	if (pm_freezing)
 		atomic_dec(&system_freezing_cnt);
@@ -182,10 +188,15 @@ void thaw_processes(void)
 
 	read_lock(&tasklist_lock);
 	do_each_thread(g, p) {
+		/* No other threads should have PF_SUSPEND_TASK set */
+		WARN_ON((p != curr) && (p->flags & PF_SUSPEND_TASK));
 		__thaw_task(p);
 	} while_each_thread(g, p);
 	read_unlock(&tasklist_lock);
 
+	WARN_ON(!(curr->flags & PF_SUSPEND_TASK));
+	curr->flags &= ~PF_SUSPEND_TASK;
+
 	usermodehelper_enable();
 
 	schedule();