Hi, it's a bit crazy but it seems to work: This tiny patch against an I-pipe kernel really allows suspend to disk/ram for a *running* Xenomai system. Just the TSC-based timers are skewed up after resume so that, e.g., the latency test takes a longer pause then. But a serious use-case would rather include a real-time application shutdown before suspend anyway.
Jan
---
kernel/power/swsusp.c | 4 ++++
1 file changed, 4 insertions(+)
Index: linux-2.6.17-ipipe/kernel/power/swsusp.c
===================================================================
--- linux-2.6.17-ipipe.orig/kernel/power/swsusp.c
+++ linux-2.6.17-ipipe/kernel/power/swsusp.c
@@ -217,6 +217,7 @@ int swsusp_suspend(void)
if ((error = arch_prepare_suspend()))
return error;
local_irq_disable();
+ local_irq_disable_hw();
/* At this point, device_suspend() has been called, but *not*
* device_power_down(). We *must* device_power_down() now.
* Otherwise, drivers for some devices (e.g. interrupt controllers)
@@ -242,6 +243,7 @@ Restore_highmem:
restore_highmem();
device_power_up();
Enable_irqs:
+ local_irq_enable_hw();
local_irq_enable();
return error;
}
@@ -250,6 +252,7 @@ int swsusp_resume(void)
{
int error;
local_irq_disable();
+ local_irq_disable_hw();
if (device_power_down(PMSG_FREEZE))
printk(KERN_ERR "Some devices failed to power down, very bad\n");
/* We'll ignore saved state, but this gets preempt count (etc) right */
@@ -268,6 +271,7 @@ int swsusp_resume(void)
restore_highmem();
touch_softlockup_watchdog();
device_power_up();
+ local_irq_enable_hw();
local_irq_enable();
return error;
}
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