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PM / Hibernate: Thaw processes in SNAPSHOT_CREATE_IMAGE ioctl test path

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Commit 2aede851dd (PM / Hibernate: Freeze
kernel threads after preallocating memory) moved the freezing of kernel
threads to hibernation_snapshot() function.

So now, if the call to hibernation_snapshot() returns early due to a
successful hibernation test, the caller has to thaw processes to ensure
that the system gets back to its original state.

But in SNAPSHOT_CREATE_IMAGE hibernation ioctl, the caller does not thaw
processes in case hibernation_snapshot() returned due to a successful
freezer test. Fix this issue. But note we still send the value of 'in_suspend'
(which is now 0) to userspace, because we are not in an error path per-se,
and moreover, the value of in_suspend correctly depicts the situation here.

Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
This commit is contained in:
Srivatsa S. Bhat 2011-12-01 22:33:10 +01:00 committed by Rafael J. Wysocki
parent 0118521cc7
commit 97819a2622
3 changed files with 11 additions and 4 deletions
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2
kernel/power/hibernate.c
View File

@ -55,7 +55,7 @@ enum {
static int hibernation_mode = HIBERNATION_SHUTDOWN;
static bool freezer_test_done;
bool freezer_test_done;
static const struct platform_hibernation_ops *hibernation_ops;

2
kernel/power/power.h
View File

@ -50,6 +50,8 @@ static inline char *check_image_kernel(struct swsusp_info *info)
#define SPARE_PAGES ((1024 * 1024) >> PAGE_SHIFT)
/* kernel/power/hibernate.c */
extern bool freezer_test_done;
extern int hibernation_snapshot(int platform_mode);
extern int hibernation_restore(int platform_mode);
extern int hibernation_platform_enter(void);

9
kernel/power/user.c
View File

@ -283,10 +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) {
error = put_user(in_suspend, (int __user *)arg);
if (!error)
if (!error && !freezer_test_done)
data->ready = 1;
if (freezer_test_done) {
freezer_test_done = false;
thaw_processes();
}
}
break;
case SNAPSHOT_ATOMIC_RESTORE: