From: 黄涛 <huangtao@rock-chips.com>
Date: Sat, 30 Jul 2011 14:31:35 +0000 (+0800)
Subject: Revert "drivers: power: Add watchdog timer to catch drivers which lockup during suspend."
X-Git-Tag: firefly_0821_release~9960
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=efa993982ad92145311be77b3a7c370553ace179;p=firefly-linux-kernel-4.4.55.git

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

This reverts commit d20c38c796134b43b46dc97faf9d09d3df437041.

Conflicts:

	drivers/base/power/main.c
---

diff --git a/drivers/base/power/main.c b/drivers/base/power/main.c
index 0855a10337ee..8aa2443182d5 100644
--- a/drivers/base/power/main.c
+++ b/drivers/base/power/main.c
@@ -25,7 +25,6 @@
 #include <linux/resume-trace.h>
 #include <linux/rwsem.h>
 #include <linux/interrupt.h>
-#include <linux/timer.h>
 
 #include "../base.h"
 #include "power.h"
@@ -44,13 +43,6 @@ LIST_HEAD(dpm_list);
 
 static DEFINE_MUTEX(dpm_list_mtx);
 
-static void dpm_drv_timeout(unsigned long data);
-static DEFINE_TIMER(dpm_drv_wd, dpm_drv_timeout, 0, 0);
-static struct {
-	struct device *dev;
-	struct task_struct *tsk;
-} dpm_drv_wd_data;
-
 /*
  * Set once the preparation of devices for a PM transition has started, reset
  * before starting to resume devices.  Protected by dpm_list_mtx.
@@ -439,52 +431,6 @@ static int device_resume(struct device *dev, pm_message_t state)
 	return error;
 }
 
-/**
- *	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 device *dev = dpm_drv_wd_data.dev;
-	struct task_struct *tsk = dpm_drv_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_drv_wdset - Sets up driver suspend/resume watchdog timer.
- *	@dev: struct device which we're guarding.
- *
- */
-static void dpm_drv_wdset(struct device *dev)
-{
-	dpm_drv_wd_data.dev = dev;
-	dpm_drv_wd_data.tsk = get_current();
-	dpm_drv_wd.data = (unsigned long) &dpm_drv_wd_data;
-	mod_timer(&dpm_drv_wd, jiffies + (HZ * 3));
-}
-
-/**
- *	dpm_drv_wdclr - clears driver suspend/resume watchdog timer.
- *	@dev: struct device which we're no longer guarding.
- *
- */
-static void dpm_drv_wdclr(struct device *dev)
-{
-	del_timer_sync(&dpm_drv_wd);
-}
-
 /**
  * dpm_resume - Execute "resume" callbacks for non-sysdev devices.
  * @state: PM transition of the system being carried out.
@@ -743,9 +689,7 @@ static int dpm_suspend(pm_message_t state)
 		get_device(dev);
 		mutex_unlock(&dpm_list_mtx);
 
-		dpm_drv_wdset(dev);
 		error = device_suspend(dev, state);
-		dpm_drv_wdclr(dev);
 
 		mutex_lock(&dpm_list_mtx);
 		if (error) {