[PATCH 43/46] s2ram: add arch irq disable/enable hooks

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 

From: Johannes Berg <[email protected]>

After some more discussion this patch replaces it:

From: Johannes Berg <[email protected]>
Subject: suspend: add arch irq disable/enable hooks

For powermac, we need to do some things between suspending devices and
device_power_off, for example setting the decrementer. This patch
allows architectures to define arch_s2ram_{en,dis}able_irqs in their
asm/suspend.h to have control over this step.

Signed-off-by: Johannes Berg <[email protected]>
Acked-by: Pavel Machek <[email protected]>
Cc: Andrew Morton <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
 include/linux/pm.h  |   18 ++++++++++++++++++
 kernel/power/main.c |   18 +++++++++++++++---
 2 files changed, 33 insertions(+), 3 deletions(-)

diff --git a/include/linux/pm.h b/include/linux/pm.h
index b0ab623..9bd86db 100644
--- a/include/linux/pm.h
+++ b/include/linux/pm.h
@@ -166,6 +166,24 @@ extern struct pm_ops *pm_ops;
 extern int pm_suspend(suspend_state_t state);
 
 
+/**
+ * arch_suspend_disable_irqs - disable IRQs for suspend
+ *
+ * Disables IRQs (in the default case). This is a weak symbol in the common
+ * code and thus allows architectures to override it if more needs to be
+ * done. Not called for suspend to disk.
+ */
+extern void arch_suspend_disable_irqs(void);
+
+/**
+ * arch_suspend_enable_irqs - enable IRQs after suspend
+ *
+ * Enables IRQs (in the default case). This is a weak symbol in the common
+ * code and thus allows architectures to override it if more needs to be
+ * done. Not called for suspend to disk.
+ */
+extern void arch_suspend_enable_irqs(void);
+
 /*
  * Device power management
  */
diff --git a/kernel/power/main.c b/kernel/power/main.c
index a064dfd..3062e94 100644
--- a/kernel/power/main.c
+++ b/kernel/power/main.c
@@ -111,13 +111,24 @@ static int suspend_prepare(suspend_state_t state)
 	return error;
 }
 
+/* default implementation */
+void __attribute__ ((weak)) arch_suspend_disable_irqs(void)
+{
+	local_irq_disable();
+}
+
+/* default implementation */
+void __attribute__ ((weak)) arch_suspend_enable_irqs(void)
+{
+	local_irq_enable();
+}
 
 int suspend_enter(suspend_state_t state)
 {
 	int error = 0;
-	unsigned long flags;
 
-	local_irq_save(flags);
+	arch_suspend_disable_irqs();
+	BUG_ON(!irqs_disabled());
 
 	if ((error = device_power_down(PMSG_SUSPEND))) {
 		printk(KERN_ERR "Some devices failed to power down\n");
@@ -126,7 +137,8 @@ int suspend_enter(suspend_state_t state)
 	error = pm_ops->enter(state);
 	device_power_up();
  Done:
-	local_irq_restore(flags);
+	arch_suspend_enable_irqs();
+	BUG_ON(irqs_disabled());
 	return error;
 }
 
-- 
1.5.1.2

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/
[Index of Archives]     [Kernel Newbies]     [Netfilter]     [Bugtraq]     [Photo]     [Stuff]     [Gimp]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Video 4 Linux]     [Linux for the blind]     [Linux Resources]
  Powered by Linux