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authorLi Shaohua <shaohua.li@intel.com>2005-06-25 14:55:06 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-06-25 16:24:32 -0700
commit5a72e04df5470df0ec646029d31e5528167ab1a7 (patch)
tree11be00c3ed3d8bad775e6eec44078c9f942537b9 /kernel/power/main.c
parentfb69c3907ead36b9e9f41ea6f0d0e0ae10a38a47 (diff)
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[PATCH] suspend/resume SMP support
Using CPU hotplug to support suspend/resume SMP. Both S3 and S4 use disable/enable_nonboot_cpus API. The S4 part is based on Pavel's original S4 SMP patch. Signed-off-by: Li Shaohua<shaohua.li@intel.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'kernel/power/main.c')
-rw-r--r--kernel/power/main.c16
1 files changed, 10 insertions, 6 deletions
diff --git a/kernel/power/main.c b/kernel/power/main.c
index 4cdebc972ff2..c94cb9e95090 100644
--- a/kernel/power/main.c
+++ b/kernel/power/main.c
@@ -55,6 +55,13 @@ static int suspend_prepare(suspend_state_t state)
pm_prepare_console();
+ disable_nonboot_cpus();
+
+ if (num_online_cpus() != 1) {
+ error = -EPERM;
+ goto Enable_cpu;
+ }
+
if (freeze_processes()) {
error = -EAGAIN;
goto Thaw;
@@ -75,6 +82,8 @@ static int suspend_prepare(suspend_state_t state)
pm_ops->finish(state);
Thaw:
thaw_processes();
+ Enable_cpu:
+ enable_nonboot_cpus();
pm_restore_console();
return error;
}
@@ -113,6 +122,7 @@ static void suspend_finish(suspend_state_t state)
if (pm_ops && pm_ops->finish)
pm_ops->finish(state);
thaw_processes();
+ enable_nonboot_cpus();
pm_restore_console();
}
@@ -150,12 +160,6 @@ static int enter_state(suspend_state_t state)
goto Unlock;
}
- /* Suspend is hard to get right on SMP. */
- if (num_online_cpus() != 1) {
- error = -EPERM;
- goto Unlock;
- }
-
pr_debug("PM: Preparing system for %s sleep\n", pm_states[state]);
if ((error = suspend_prepare(state)))
goto Unlock;