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authorRafael J. Wysocki <rjw@sisk.pl>2011-03-15 00:43:46 +0100
committerRafael J. Wysocki <rjw@sisk.pl>2011-03-15 00:43:46 +0100
commit40dc166cb5dddbd36aa4ad11c03915ea538f5a61 (patch)
tree0a778159cf89ddee9e7d3134ae40569bdccd2a24 /kernel/sys.c
parentf9b9e806ae0ede772cbb9916d9ac7354a123d044 (diff)
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PM / Core: Introduce struct syscore_ops for core subsystems PM
Some subsystems need to carry out suspend/resume and shutdown operations with one CPU on-line and interrupts disabled. The only way to register such operations is to define a sysdev class and a sysdev specifically for this purpose which is cumbersome and inefficient. Moreover, the arguments taken by sysdev suspend, resume and shutdown callbacks are practically never necessary. For this reason, introduce a simpler interface allowing subsystems to register operations to be executed very late during system suspend and shutdown and very early during resume in the form of strcut syscore_ops objects. Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Acked-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'kernel/sys.c')
-rw-r--r--kernel/sys.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/kernel/sys.c b/kernel/sys.c
index 18da702ec813..1ad48b3b9068 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -37,6 +37,7 @@
#include <linux/ptrace.h>
#include <linux/fs_struct.h>
#include <linux/gfp.h>
+#include <linux/syscore_ops.h>
#include <linux/compat.h>
#include <linux/syscalls.h>
@@ -298,6 +299,7 @@ void kernel_restart_prepare(char *cmd)
system_state = SYSTEM_RESTART;
device_shutdown();
sysdev_shutdown();
+ syscore_shutdown();
}
/**
@@ -336,6 +338,7 @@ void kernel_halt(void)
{
kernel_shutdown_prepare(SYSTEM_HALT);
sysdev_shutdown();
+ syscore_shutdown();
printk(KERN_EMERG "System halted.\n");
kmsg_dump(KMSG_DUMP_HALT);
machine_halt();
@@ -355,6 +358,7 @@ void kernel_power_off(void)
pm_power_off_prepare();
disable_nonboot_cpus();
sysdev_shutdown();
+ syscore_shutdown();
printk(KERN_EMERG "Power down.\n");
kmsg_dump(KMSG_DUMP_POWEROFF);
machine_power_off();