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DateThu, 19 May 2011 11:04:55 -0700
FromGreg KH <>
Subject[27/71] PM / Hibernate: Fix ioctl SNAPSHOT_S2RAM
2.6.38-stable review patch.  If anyone has any objections, please let us know.

------------------
From: Rafael J. Wysocki <rjw@sisk.pl>

commit 36cb7035ea0c11ef2c7fa2bbe0cd181b23569b29 upstream.

The SNAPSHOT_S2RAM ioctl used for implementing the feature allowing
one to suspend to RAM after creating a hibernation image is currently
broken, because it doesn't clear the "ready" flag in the struct
snapshot_data object handled by it. As a result, the
SNAPSHOT_UNFREEZE doesn't work correctly after SNAPSHOT_S2RAM has
returned and the user space hibernate task cannot thaw the other
processes as appropriate. Make SNAPSHOT_S2RAM clear data->ready
to fix this problem.

Tested-by: Alexandre Felipe Muller de Souza <alexandrefm@mandriva.com.br>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

---
kernel/power/user.c | 1 +
1 file changed, 1 insertion(+)
--- a/kernel/power/user.c
+++ b/kernel/power/user.c
@@ -381,6 +381,7 @@ static long snapshot_ioctl(struct file *
* PM_HIBERNATION_PREPARE
*/
error = suspend_devices_and_enter(PM_SUSPEND_MEM);
+ data->ready = 0;
break;

case SNAPSHOT_PLATFORM_SUPPORT:



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