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PM: hibernate: Incorporate concurrency handling

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Hibernation concurrency handling is currently delegated to user.c,
where it's also used for regulating the access to the snapshot device.

In the prospective of making user.c a separate configuration option,
such mutual exclusion is brought into hibernate.c and made available
through accessor helpers hereby introduced.

Signed-off-by: Domenico Andreoli <domenico.andreoli@linux.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Domenico Andreoli
2020-05-07 09:19:52 +02:00
committed by Rafael J. Wysocki
parent 3a4ccdb92e
commit ab7e9b067f
3 changed files with 22 additions and 12 deletions
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10
kernel/power/user.c
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@@ -37,8 +37,6 @@ static struct snapshot_data {
bool free_bitmaps;
} snapshot_state;
atomic_t snapshot_device_available = ATOMIC_INIT(1);
static int snapshot_open(struct inode *inode, struct file *filp)
{
struct snapshot_data *data;
@@ -49,13 +47,13 @@ static int snapshot_open(struct inode *inode, struct file *filp)
lock_system_sleep();
if (!atomic_add_unless(&snapshot_device_available, -1, 0)) {
if (!hibernate_acquire()) {
error = -EBUSY;
goto Unlock;
}
if ((filp->f_flags & O_ACCMODE) == O_RDWR) {
atomic_inc(&snapshot_device_available);
hibernate_release();
error = -ENOSYS;
goto Unlock;
}
@@ -92,7 +90,7 @@ static int snapshot_open(struct inode *inode, struct file *filp)
__pm_notifier_call_chain(PM_POST_RESTORE, nr_calls, NULL);
}
if (error)
atomic_inc(&snapshot_device_available);
hibernate_release();
data->frozen = false;
data->ready = false;
@@ -122,7 +120,7 @@ static int snapshot_release(struct inode *inode, struct file *filp)
}
pm_notifier_call_chain(data->mode == O_RDONLY ?
PM_POST_HIBERNATION : PM_POST_RESTORE);
atomic_inc(&snapshot_device_available);
hibernate_release();
unlock_system_sleep();