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PM: Add missing syscore_suspend() and syscore_resume() calls

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Device suspend/resume infrastructure is used not only by the suspend
and hibernate code in kernel/power, but also by APM, Xen and the
kexec jump feature.  However, commit 40dc166cb5
(PM / Core: Introduce struct syscore_ops for core subsystems PM)
failed to add syscore_suspend() and syscore_resume() calls to that
code, which generally leads to breakage when the features in question
are used.

To fix this problem, add the missing syscore_suspend() and
syscore_resume() calls to arch/x86/kernel/apm_32.c, kernel/kexec.c
and drivers/xen/manage.c.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Greg Kroah-Hartman <gregkh@suse.de>
Acked-by: Ian Campbell <ian.campbell@citrix.com>
This commit is contained in:
Rafael J. Wysocki 2011-04-20 00:36:11 +02:00
parent 2ca6f62f59
commit 19234c0819
4 changed files with 22 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
arch/x86/kernel/apm_32.c
View File

@ -228,6 +228,7 @@
#include <linux/kthread.h>
#include <linux/jiffies.h>
#include <linux/acpi.h>
#include <linux/syscore_ops.h>
#include <asm/system.h>
#include <asm/uaccess.h>
@ -1238,6 +1239,7 @@ static int suspend(int vetoable)
local_irq_disable();
sysdev_suspend(PMSG_SUSPEND);
syscore_suspend();
local_irq_enable();
@ -1255,6 +1257,7 @@ static int suspend(int vetoable)
apm_error("suspend", err);
err = (err == APM_SUCCESS) ? 0 : -EIO;
syscore_resume();
sysdev_resume();
local_irq_enable();
@ -1280,6 +1283,7 @@ static void standby(void)
local_irq_disable();
sysdev_suspend(PMSG_SUSPEND);
syscore_suspend();
local_irq_enable();
err = set_system_power_state(APM_STATE_STANDBY);
@ -1287,6 +1291,7 @@ static void standby(void)
apm_error("standby", err);
local_irq_disable();
syscore_resume();
sysdev_resume();
local_irq_enable();

2
drivers/base/syscore.c
View File

@ -73,6 +73,7 @@ int syscore_suspend(void)
return ret;
}
EXPORT_SYMBOL_GPL(syscore_suspend);
/**
* syscore_resume - Execute all the registered system core resume callbacks.
@ -95,6 +96,7 @@ void syscore_resume(void)
"Interrupts enabled after %pF\n", ops->resume);
}
}
EXPORT_SYMBOL_GPL(syscore_resume);
#endif /* CONFIG_PM_SLEEP */
/**

9
drivers/xen/manage.c
View File

@ -8,6 +8,7 @@
#include <linux/sysrq.h>
#include <linux/stop_machine.h>
#include <linux/freezer.h>
#include <linux/syscore_ops.h>
#include <xen/xen.h>
#include <xen/xenbus.h>
@ -70,8 +71,13 @@ static int xen_suspend(void *data)
BUG_ON(!irqs_disabled());
err = sysdev_suspend(PMSG_FREEZE);
if (!err) {
err = syscore_suspend();
if (err)
sysdev_resume();
}
if (err) {
printk(KERN_ERR "xen_suspend: sysdev_suspend failed: %d\n",
printk(KERN_ERR "xen_suspend: system core suspend failed: %d\n",
err);
return err;
}
@ -95,6 +101,7 @@ static int xen_suspend(void *data)
xen_timer_resume();
}
syscore_resume();
sysdev_resume();
return 0;

7
kernel/kexec.c
View File

@ -33,6 +33,7 @@
#include <linux/vmalloc.h>
#include <linux/swap.h>
#include <linux/kmsg_dump.h>
#include <linux/syscore_ops.h>
#include <asm/page.h>
#include <asm/uaccess.h>
@ -1532,6 +1533,11 @@ int kernel_kexec(void)
local_irq_disable();
/* Suspend system devices */
error = sysdev_suspend(PMSG_FREEZE);
if (!error) {
error = syscore_suspend();
if (error)
sysdev_resume();
}
if (error)
goto Enable_irqs;
} else
@ -1546,6 +1552,7 @@ int kernel_kexec(void)
#ifdef CONFIG_KEXEC_JUMP
if (kexec_image->preserve_context) {
syscore_resume();
sysdev_resume();
Enable_irqs:
local_irq_enable();