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From 695cb013a3332b6c773c8a75be97aa6f91bc227f Mon Sep 17 00:00:00 2001
From: "Srivatsa S. Bhat" <srivatsa.bhat@linux.vnet.ibm.com>
Date: Wed, 1 Feb 2012 22:16:36 +0100
Subject: [PATCH 37/87] PM / Hibernate: Thaw kernel threads in
SNAPSHOT_CREATE_IMAGE ioctl path
commit fe9161db2e6053da21e4649d77bbefaf3030b11d upstream.
In the SNAPSHOT_CREATE_IMAGE ioctl, if the call to hibernation_snapshot()
fails, the frozen tasks are not thawed.
And in the case of success, if we happen to exit due to a successful freezer
test, all tasks (including those of userspace) are thawed, whereas actually
we should have thawed only the kernel threads at that point. Fix both these
issues.
Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
kernel/power/user.c | 6 ++++--
1 files changed, 4 insertions(+), 2 deletions(-)
diff --git a/kernel/power/user.c b/kernel/power/user.c
index f08bbfb..f08d227 100644
--- a/kernel/power/user.c
+++ b/kernel/power/user.c
@@ -283,13 +283,15 @@ static long snapshot_ioctl(struct file *filp, unsigned int cmd,
}
pm_restore_gfp_mask();
error = hibernation_snapshot(data->platform_support);
- if (!error) {
+ if (error) {
+ thaw_kernel_threads();
+ } else {
error = put_user(in_suspend, (int __user *)arg);
if (!error && !freezer_test_done)
data->ready = 1;
if (freezer_test_done) {
freezer_test_done = false;
- thaw_processes();
+ thaw_kernel_threads();
}
}
break;
--
1.7.7.4
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