linux-kernel - [patch 37/86] PM / Hibernate: Thaw kernel threads in SNAPSHOT_CREATE

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Date:	Fri, 10 Feb 2012 14:29:56 -0800
From:	Greg KH <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk,
	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>
Subject: [patch 37/86] PM / Hibernate: Thaw kernel threads in SNAPSHOT_CREATE_IMAGE ioctl path

3.2-stable review patch.  If anyone has any objections, please let me know.

------------------

From: "Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>

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@...ux.vnet.ibm.com>
Signed-off-by: Rafael J. Wysocki <rjw@...k.pl>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 kernel/power/user.c |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

--- a/kernel/power/user.c
+++ b/kernel/power/user.c
@@ -283,13 +283,15 @@ static long snapshot_ioctl(struct file *
 		}
 		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;

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