linux-kernel - [PATCH 2/3] PM / Hibernate: Make snapshot

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Message-Id: <201105070031.17048.rjw@sisk.pl>
Date:	Sat, 7 May 2011 00:31:16 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Linux PM mailing list <linux-pm@...ts.linux-foundation.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Alexandre Felipe Muller de Souza 
	<alexandrefm@...driva.com.br>
Subject: [PATCH 2/3] PM / Hibernate: Make snapshot_release() restore GFP mask

From: Rafael J. Wysocki <rjw@...k.pl>

If the process using the hibernate user space interface closes
/dev/snapshot after creating a hibernation image without thawing
tasks, snapshot_release() should call pm_restore_gfp_mask() to
restore the GFP mask used before the creation of the image.  Make
that happen.

Signed-off-by: Rafael J. Wysocki <rjw@...k.pl>
---
 kernel/power/user.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

Index: linux-2.6/kernel/power/user.c
===================================================================
--- linux-2.6.orig/kernel/power/user.c
+++ linux-2.6/kernel/power/user.c
@@ -135,8 +135,10 @@ static int snapshot_release(struct inode
 	free_basic_memory_bitmaps();
 	data = filp->private_data;
 	free_all_swap_pages(data->swap);
-	if (data->frozen)
+	if (data->frozen) {
+		pm_restore_gfp_mask();
 		thaw_processes();
+	}
 	pm_notifier_call_chain(data->mode == O_RDONLY ?
 			PM_POST_HIBERNATION : PM_POST_RESTORE);
 	atomic_inc(&snapshot_device_available);

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