http://bugzilla.kernel.org/show_bug.cgi?id=5989
------- Additional Comments From [EMAIL PROTECTED] 2006-03-30 14:13 -------
Bad news. I made a cleaned-up patch (below) and tested it, and it hung
on the 4th sleep. That was with debug_{level,layer}=0x10, so I didn't
get much debugging info. It printed the 'Execute method' for _PTS, and
then hung at "Exec" -- I guess printing it for SST.
Just to make sure I wasn't imagining that the problem had been fixed, I
return to the usual debugging: layer=0x90 and level=0x1F. And it cycled
with no problem (18 tries)!
So we're not done yet, and maybe we're just treating the symptoms?
-Sanjoy
diff -r ac486e270597 -r abd89292c539 drivers/acpi/osl.c
--- a/drivers/acpi/osl.c Sat Mar 18 08:35:34 2006 -0500
+++ b/drivers/acpi/osl.c Thu Mar 30 10:59:57 2006 -0500
@@ -634,6 +634,8 @@ static void acpi_os_execute_deferred(voi
return_VOID;
}
+extern int acpi_in_suspend;
+
acpi_status
acpi_os_queue_for_execution(u32 priority,
acpi_osd_exec_callback function, void *context)
@@ -643,6 +645,8 @@ acpi_os_queue_for_execution(u32 priority
struct work_struct *task;
ACPI_FUNCTION_TRACE("os_queue_for_execution");
+ if (acpi_in_suspend) /* in case kacpid is causing the queue */
+ return_ACPI_STATUS(AE_OK);
ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
"Scheduling function [%p(%p)] for deferred
execution.\n",
diff -r ac486e270597 -r abd89292c539 drivers/acpi/sleep/main.c
--- a/drivers/acpi/sleep/main.c Sat Mar 18 08:35:34 2006 -0500
+++ b/drivers/acpi/sleep/main.c Thu Mar 30 10:59:57 2006 -0500
@@ -19,6 +19,12 @@
#include <acpi/acpi_drivers.h>
#include "sleep.h"
+/* for functions putting machine to sleep to know that we're
+ suspending, so that they can careful about what AML methods they
+ invoke (to avoid trying untested BIOS code paths) */
+int acpi_in_suspend;
+EXPORT_SYMBOL(acpi_in_suspend);
+
u8 sleep_states[ACPI_S_STATE_COUNT];
static struct pm_ops acpi_pm_ops;
@@ -55,6 +61,8 @@ static int acpi_pm_prepare(suspend_state
printk("acpi_pm_prepare does not support %d \n", pm_state);
return -EPERM;
}
+ acpi_os_wait_events_complete(NULL);
+ acpi_in_suspend = TRUE;
return acpi_sleep_prepare(acpi_state);
}
@@ -132,6 +140,7 @@ static int acpi_pm_finish(suspend_state_
u32 acpi_state = acpi_suspend_states[pm_state];
acpi_leave_sleep_state(acpi_state);
+ acpi_in_suspend = FALSE;
acpi_disable_wakeup_device(acpi_state);
/* reset firmware waking vector */
diff -r ac486e270597 -r abd89292c539 drivers/acpi/thermal.c
--- a/drivers/acpi/thermal.c Sat Mar 18 08:35:34 2006 -0500
+++ b/drivers/acpi/thermal.c Thu Mar 30 10:59:57 2006 -0500
@@ -79,6 +79,8 @@ static int tzp;
static int tzp;
module_param(tzp, int, 0);
MODULE_PARM_DESC(tzp, "Thermal zone polling frequency, in 1/10 seconds.\n");
+
+extern int acpi_in_suspend;
static int acpi_thermal_add(struct acpi_device *device);
static int acpi_thermal_remove(struct acpi_device *device, int type);
@@ -683,6 +685,8 @@ static void acpi_thermal_run(unsigned lo
static void acpi_thermal_run(unsigned long data)
{
struct acpi_thermal *tz = (struct acpi_thermal *)data;
+ if (acpi_in_suspend) /* thermal methods might cause a hang */
+ return_VOID; /* so don't do them */
if (!tz->zombie)
acpi_os_queue_for_execution(OSD_PRIORITY_GPE,
acpi_thermal_check, (void *)data);
@@ -705,6 +709,8 @@ static void acpi_thermal_check(void *dat
state = tz->state;
+ if (acpi_in_suspend)
+ return_VOID;
result = acpi_thermal_get_temperature(tz);
if (result)
return_VOID;
@@ -1224,6 +1230,9 @@ static void acpi_thermal_notify(acpi_han
struct acpi_device *device = NULL;
ACPI_FUNCTION_TRACE("acpi_thermal_notify");
+
+ if (acpi_in_suspend) /* thermal methods might cause a hang */
+ return_VOID; /* so don't do them */
if (!tz)
return_VOID;
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