[PATCH] Complain if driver reenables interrupts during drivers_[suspend|resume] & re-disable

[Nigel Cunningham <ncunningham@cyclades.com>]

Hi all.

This patch is designed to help with diagnosing and fixing the cause of
problems in suspending/resuming, due to drivers wrongly re-enabling
interrupts in their .suspend or .resume methods. 

I nearly forgot about it in sending patches in suspend2 that might help
where swsusp fails.

Signed-off-by: Nigel Cunningham <nigel@suspend2.net>

 power/resume.c  |    5 +++++
 power/suspend.c |    5 +++++
 sys.c           |   37 +++++++++++++++++++++++++++++++++++--
 3 files changed, 45 insertions(+), 2 deletions(-)
diff -ruNp 8010-driver-model-debug.patch-old/drivers/base/power/resume.c 
8010-driver-model-debug.patch-new/drivers/base/power/resume.c
--- 8010-driver-model-debug.patch-old/drivers/base/power/resume.c	
2006-01-19 21:27:39.000000000 +1000
+++ 8010-driver-model-debug.patch-new/drivers/base/power/resume.c	
2006-01-31 19:54:52.000000000 +1000
@@ -35,6 +35,11 @@ int resume_device(struct device * dev)
 	if (dev->bus && dev->bus->resume) {
 		dev_dbg(dev,"resuming\n");
 		error = dev->bus->resume(dev);
+		if (!irqs_disabled()) {
+			printk(KERN_EMERG "WARNING: Interrupts reenabled while resuming device 
%s.\n",
+				kobject_name(&dev->kobj));
+			local_irq_disable();
+		}
 	}
 	up(&dev->sem);
 	return error;
diff -ruNp 8010-driver-model-debug.patch-old/drivers/base/power/suspend.c 
8010-driver-model-debug.patch-new/drivers/base/power/suspend.c
--- 8010-driver-model-debug.patch-old/drivers/base/power/suspend.c	
2006-01-19 21:27:39.000000000 +1000
+++ 8010-driver-model-debug.patch-new/drivers/base/power/suspend.c	
2006-01-31 19:54:44.000000000 +1000
@@ -58,6 +58,11 @@ int suspend_device(struct device * dev, 
 	if (dev->bus && dev->bus->suspend && !dev->power.power_state.event) {
 		dev_dbg(dev, "suspending\n");
 		error = dev->bus->suspend(dev, state);
+		if (!irqs_disabled()) {
+			printk(KERN_EMERG "WARNING: Interrupts reenabled while suspending 
device %s.\n",
+				kobject_name(&dev->kobj));
+			local_irq_disable();
+		}
 	}
 	up(&dev->sem);
 	return error;
diff -ruNp 8010-driver-model-debug.patch-old/drivers/base/sys.c 
8010-driver-model-debug.patch-new/drivers/base/sys.c
--- 8010-driver-model-debug.patch-old/drivers/base/sys.c	2006-01-19 
21:27:39.000000000 +1000
+++ 8010-driver-model-debug.patch-new/drivers/base/sys.c	2006-01-31 
19:54:09.000000000 +1000
@@ -298,16 +298,34 @@ static void __sysdev_resume(struct sys_d
 	if (cls->resume)
 		cls->resume(dev);
 
+	if (!irqs_disabled()) {
+		printk(KERN_EMERG "WARNING: Interrupts reenabled while resuming sysdev 
class specific driver %s.\n",
+				kobject_name(&dev->kobj));
+		local_irq_disable();
+	}
+
 	/* Call auxillary drivers next. */
 	list_for_each_entry(drv, &cls->drivers, entry) {
-		if (drv->resume)
+		if (drv->resume) {
 			drv->resume(dev);
+			if (!irqs_disabled()) {
+				printk(KERN_EMERG "WARNING: Interrupts reenabled while resuming sysdev 
class driver %s.\n",
+				kobject_name(&dev->kobj));
+				local_irq_disable();
+			}
+		}
 	}
 
 	/* Call global drivers. */
 	list_for_each_entry(drv, &sysdev_drivers, entry) {
-		if (drv->resume)
+		if (drv->resume) {
 			drv->resume(dev);
+			if (!irqs_disabled()) {
+				printk(KERN_EMERG "WARNING: Interrupts reenabled while resuming sysdev 
driver %s.\n",
+				kobject_name(&dev->kobj));
+				local_irq_disable();
+			}
+		}
 	}
 }
 
@@ -346,6 +364,11 @@ int sysdev_suspend(pm_message_t state)
 			list_for_each_entry(drv, &sysdev_drivers, entry) {
 				if (drv->suspend) {
 					ret = drv->suspend(sysdev, state);
+					if (!irqs_disabled()) {
+						printk(KERN_EMERG "WARNING: Interrupts reenabled while suspending 
sysdev driver %s.\n",
+							kobject_name(&sysdev->kobj));
+						local_irq_disable();
+					}
 					if (ret)
 						goto gbl_driver;
 				}
@@ -355,6 +378,11 @@ int sysdev_suspend(pm_message_t state)
 			list_for_each_entry(drv, &cls->drivers, entry) {
 				if (drv->suspend) {
 					ret = drv->suspend(sysdev, state);
+					if (!irqs_disabled()) {
+						printk(KERN_EMERG "WARNING: Interrupts reenabled while suspending 
sysdev class driver %s.\n",
+						kobject_name(&sysdev->kobj));
+						local_irq_disable();
+					}
 					if (ret)
 						goto aux_driver;
 				}
@@ -363,6 +391,11 @@ int sysdev_suspend(pm_message_t state)
 			/* Now call the generic one */
 			if (cls->suspend) {
 				ret = cls->suspend(sysdev, state);
+				if (!irqs_disabled()) {
+					printk(KERN_EMERG "WARNING: Interrupts reenabled while suspending 
class driver %s.\n",
+					kobject_name(&sysdev->kobj));
+					local_irq_disable();
+				}
 				if (ret)
 					goto cls_driver;
 			}

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