Revert "drivers: power: Add watchdog timer to catch drivers which lockup during suspend."

This reverts commit ad86cc8ad63229eeeba0628e99f2f59df55a25fd.

Commit 70fea60d888d ("PM / Sleep: Detect device suspend/resume lockup...")
added a suspend/resume watchdog timer to catch the lockup. Let's revert the
duplicate one.

Change-Id: Ic72a87432e27844155467817600adc6cf0c2209c
Signed-off-by: Lianwei Wang <lianwei.wang@gmail.com>
Signed-off-by: Amit Pundir <amit.pundir@linaro.org>

1 files changed, 0 insertions, 43 deletions

diff --git a/drivers/base/power/main.c b/drivers/base/power/main.c
index 6ed8b9326629..2f7a6e1b568c 100644
--- a/drivers/base/power/main.c
+++ b/drivers/base/power/main.c
@@ -62,12 +62,6 @@ struct suspend_stats suspend_stats;
 static DEFINE_MUTEX(dpm_list_mtx);
 static pm_message_t pm_transition;
 
-static void dpm_drv_timeout(unsigned long data);
-struct dpm_drv_wd_data {
-	struct device *dev;
-	struct task_struct *tsk;
-};
-
 static int async_error;
 
 static char *pm_verb(int event)
@@ -839,30 +833,6 @@ static void async_resume(void *data, async_cookie_t cookie)
 }
 
 /**
- *	dpm_drv_timeout - Driver suspend / resume watchdog handler
- *	@data: struct device which timed out
- *
- * 	Called when a driver has timed out suspending or resuming.
- * 	There's not much we can do here to recover so
- * 	BUG() out for a crash-dump
- *
- */
-static void dpm_drv_timeout(unsigned long data)
-{
-	struct dpm_drv_wd_data *wd_data = (void *)data;
-	struct device *dev = wd_data->dev;
-	struct task_struct *tsk = wd_data->tsk;
-
-	printk(KERN_EMERG "**** DPM device timeout: %s (%s)\n", dev_name(dev),
-	       (dev->driver ? dev->driver->name : "no driver"));
-
-	printk(KERN_EMERG "dpm suspend stack:\n");
-	show_stack(tsk, NULL);
-
-	BUG();
-}
-
-/**
  * dpm_resume - Execute "resume" callbacks for non-sysdev devices.
  * @state: PM transition of the system being carried out.
  *
@@ -1380,8 +1350,6 @@ static int __device_suspend(struct device *dev, pm_message_t state, bool async)
 	pm_callback_t callback = NULL;
 	char *info = NULL;
 	int error = 0;
-	struct timer_list timer;
-	struct dpm_drv_wd_data data;
 	char suspend_abort[MAX_SUSPEND_ABORT_LEN];
 	DECLARE_DPM_WATCHDOG_ON_STACK(wd);
 
@@ -1412,14 +1380,6 @@ static int __device_suspend(struct device *dev, pm_message_t state, bool async)
 
 	if (dev->power.syscore)
 		goto Complete;
-	
-	data.dev = dev;
-	data.tsk = current;
-	init_timer_on_stack(&timer);
-	timer.expires = jiffies + HZ * 12;
-	timer.function = dpm_drv_timeout;
-	timer.data = (unsigned long)&data;
-	add_timer(&timer);
 
 	if (dev->power.direct_complete) {
 		if (pm_runtime_status_suspended(dev)) {
@@ -1500,9 +1460,6 @@ static int __device_suspend(struct device *dev, pm_message_t state, bool async)
 	device_unlock(dev);
 	dpm_watchdog_clear(&wd);
 
-	del_timer_sync(&timer);
-	destroy_timer_on_stack(&timer);
-
  Complete:
 	complete_all(&dev->power.completion);
 	if (error)