linux-kernel - [PATCH] PM/Hibernate: Thaw kernel threads in SNAPSHOT_CREATE

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Date:	Tue, 31 Jan 2012 03:24:16 +0530
From:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
CC:	"pavel@....cz" <pavel@....cz>,
	"len.brown@...el.com" <len.brown@...el.com>,
	Tejun Heo <tj@...nel.org>,
	Linux PM mailing list <linux-pm@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: [PATCH] PM/Hibernate: Thaw kernel threads in SNAPSHOT_CREATE_IMAGE
 ioctl path

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.

Cc: stable@...r.kernel.org
Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@...ux.vnet.ibm.com>
---
This applies on top of the patch posted at https://lkml.org/lkml/2012/1/27/501

 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 e5a21a8..3e10007 100644
--- a/kernel/power/user.c
+++ b/kernel/power/user.c
@@ -249,13 +249,15 @@ 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;


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