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Date: Sat, 23 Feb 2008 20:30:44 -0800
From: Julian Blake Kongslie <jblake@...wallhack.org>
To: "Rafael J. Wysocki" <rjw@...k.pl>
Cc: linux-kernel@...r.kernel.org
Subject: Re: Hang on suspend
On Sat, 2008-02-23 at 21:43 +0100, Rafael J. Wysocki wrote:
> Can you please apply the appened patch and retest?
Didn't apply cleanly to v2.6.25-rc2; I had to mangle one or two lines.
The patch I applied follows at the end of this message.
Unfortunately, it's about the same as before. I got:
Freezing user space processes ... (elapsed 0.00 seconds) done.
Freezing remaining freezable tasks ... (elapsed 0.00 seconds) done.
ACPI: Preparing to enter system sleep state S3
sd 0:0:0:0: [sda] Synchronizing SCSI cache
sd 0:0:0:0: [sda] Stopping disk
nsc-ircc 00:0b: disabled
parport_pc 00:0a: disabled
eth1: Going into suspend...
ACPI: PCI interrupt for device 0000:0b:02.0 disabled
ACPI: PCI interrupt for device 0000:00:1e.3 disabled
ACPI: PCI interrupt for device 0000:00:1e.2 disabled
ACPI: PCI interrupt for device 0000:00:1d.7 disabled
ACPI: PCI interrupt for device 0000:00:1d.3 disabled
ACPI: PCI interrupt for device 0000:00:1d.2 disabled
ACPI: PCI interrupt for device 0000:00:1d.1 disabled
ACPI: PCI interrupt for device 0000:00:1d.0 disabled
BUG: unable to handle kernel NULL pointer dereference at 00000090
And the oops and stacktrace that follows appears essentially identical
to the one I already transcribed. If you need it copied, I've got
photographs, but I'd like to save myself the typing...
Those PCI devices, in case it matters, are:
0b:02.0 Wireless card (Intel 2200BG)
00:1e.3 Modem (ICH6 AC'97)
00:1e.2 Audio (ICH6 AC'97)
00:1e.0 82801 Mobile PCI Bridge
00:1d.7 USB2 EHCI
00:1d.3 USB UHCI
00:1d.2 USB UHCI
00:1d.1 USB UHCI
00:1d.0 USB UHCI
The other devices not mentioned are:
0b:00.0 CardBus Bridge: Ricoh Co Ltd RL5c476 II (rev 8d)
02:00.0 Ethernet (Broadcom BCM5751M)
01:00.0 ATI Mobility FireGL V3200
00:1f.3 SMBus (ICH6)
00:1f.2 ICH6M SATA
00:1f.0 ICH6M LPC Interface Bridge
00:1c.2 ICH6 PCI Express Port 3
00:1c.0 ICH6 PCI Express Port 1
00:01.0 915GM/PM PCI Express Root Port
00:00.0 Processor to DRAM Controller
> Thanks,
> Rafael
Thanks for the help!
--
-Julian Blake Kongslie
<jblake@...wallhack.org>
If this is a mailing list, please CC me on replies.
vim: set ft=text :
Here's the patch against v2.6.25-rc2 I used:
diff --git a/drivers/base/power/main.c b/drivers/base/power/main.c
index bdc03f7..e3095c7 100644
--- a/drivers/base/power/main.c
+++ b/drivers/base/power/main.c
@@ -48,7 +48,6 @@
*/
LIST_HEAD(dpm_active);
-static LIST_HEAD(dpm_locked);
static LIST_HEAD(dpm_off);
static LIST_HEAD(dpm_off_irq);
static LIST_HEAD(dpm_destroy);
@@ -81,28 +80,6 @@ void device_pm_add(struct device *dev)
*/
void device_pm_remove(struct device *dev)
{
- /*
- * If this function is called during a suspend, it will be blocked,
- * because we're holding the device's semaphore at that time, which may
- * lead to a deadlock. In that case we want to print a warning.
- * However, it may also be called by unregister_dropped_devices() with
- * the device's semaphore released, in which case the warning should
- * not be printed.
- */
- if (down_trylock(&dev->sem)) {
- if (down_read_trylock(&pm_sleep_rwsem)) {
- /* No suspend in progress, wait on dev->sem */
- down(&dev->sem);
- up_read(&pm_sleep_rwsem);
- } else {
- /* Suspend in progress, we may deadlock */
- dev_warn(dev, "Suspicious %s during suspend\n",
- __FUNCTION__);
- dump_stack();
- /* The user has been warned ... */
- down(&dev->sem);
- }
- }
pr_debug("PM: Removing info for %s:%s\n",
dev->bus ? dev->bus->name : "No Bus",
kobject_name(&dev->kobj));
@@ -110,7 +87,6 @@ void device_pm_remove(struct device *dev)
dpm_sysfs_remove(dev);
list_del_init(&dev->power.entry);
mutex_unlock(&dpm_list_mtx);
- up(&dev->sem);
}
/**
@@ -266,7 +242,7 @@ static void dpm_resume(void)
struct list_head *entry = dpm_off.next;
struct device *dev = to_device(entry);
- list_move_tail(entry, &dpm_locked);
+ list_move_tail(entry, &dpm_active);
mutex_unlock(&dpm_list_mtx);
resume_device(dev);
mutex_lock(&dpm_list_mtx);
@@ -275,25 +251,6 @@ static void dpm_resume(void)
}
/**
- * unlock_all_devices - Release each device's semaphore
- *
- * Go through the dpm_off list. Put each device on the dpm_active
- * list and unlock it.
- */
-static void unlock_all_devices(void)
-{
- mutex_lock(&dpm_list_mtx);
- while (!list_empty(&dpm_locked)) {
- struct list_head *entry = dpm_locked.prev;
- struct device *dev = to_device(entry);
-
- list_move(entry, &dpm_active);
- up(&dev->sem);
- }
- mutex_unlock(&dpm_list_mtx);
-}
-
-/**
* unregister_dropped_devices - Unregister devices scheduled for removal
*
* Unregister all devices on the dpm_destroy list.
@@ -305,7 +262,6 @@ static void unregister_dropped_devices(void)
struct list_head *entry = dpm_destroy.next;
struct device *dev = to_device(entry);
- up(&dev->sem);
mutex_unlock(&dpm_list_mtx);
/* This also removes the device from the list */
device_unregister(dev);
@@ -324,7 +280,6 @@ void device_resume(void)
{
might_sleep();
dpm_resume();
- unlock_all_devices();
unregister_dropped_devices();
up_write(&pm_sleep_rwsem);
}
@@ -461,8 +416,8 @@ static int dpm_suspend(pm_message_t state)
int error = 0;
mutex_lock(&dpm_list_mtx);
- while (!list_empty(&dpm_locked)) {
- struct list_head *entry = dpm_locked.prev;
+ while (!list_empty(&dpm_active)) {
+ struct list_head *entry = dpm_active.prev;
struct device *dev = to_device(entry);
list_del_init(&dev->power.entry);
@@ -478,7 +433,7 @@ static int dpm_suspend(pm_message_t state)
""));
mutex_lock(&dpm_list_mtx);
if (list_empty(&dev->power.entry))
- list_add(&dev->power.entry, &dpm_locked);
+ list_add_tail(&dev->power.entry, &dpm_active);
mutex_unlock(&dpm_list_mtx);
break;
}
@@ -492,36 +447,6 @@ static int dpm_suspend(pm_message_t state)
}
/**
- * lock_all_devices - Acquire every device's semaphore
- *
- * Go through the dpm_active list. Carefully lock each device's
- * semaphore and put it in on the dpm_locked list.
- */
-static void lock_all_devices(void)
-{
- mutex_lock(&dpm_list_mtx);
- while (!list_empty(&dpm_active)) {
- struct list_head *entry = dpm_active.next;
- struct device *dev = to_device(entry);
-
- /* Required locking order is dev->sem first,
- * then dpm_list_mutex. Hence this awkward code.
- */
- get_device(dev);
- mutex_unlock(&dpm_list_mtx);
- down(&dev->sem);
- mutex_lock(&dpm_list_mtx);
-
- if (list_empty(entry))
- up(&dev->sem); /* Device was removed */
- else
- list_move_tail(entry, &dpm_locked);
- put_device(dev);
- }
- mutex_unlock(&dpm_list_mtx);
-}
-
-/**
* device_suspend - Save state and stop all devices in system.
*
* Prevent new devices from being registered, then lock all devices
@@ -533,7 +458,6 @@ int device_suspend(pm_message_t state)
might_sleep();
down_write(&pm_sleep_rwsem);
- lock_all_devices();
error = dpm_suspend(state);
if (error)
device_resume();
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