PM / hibernate: Create memory bitmaps after freezing user space

The hibernation core uses special memory bitmaps during image
creation and restoration and traditionally those bitmaps are
allocated before freezing tasks, because in the past GFP_KERNEL
allocations might not work after all tasks had been frozen.

However, this is an anachronism, because hibernation_snapshot()
now calls hibernate_preallocate_memory() which allocates memory
for the image upfront anyway, so the memory bitmaps may be
allocated after freezing user space safely.

For this reason, move all of the create_basic_memory_bitmaps()
calls after freeze_processes() and all of the corresponding
free_basic_memory_bitmaps() calls before thaw_processes().

This will allow us to hold device_hotplug_lock around hibernation
without the need to worry about freezing issues with user space
processes attempting to acquire it via sysfs attributes after the
creation of memory bitmaps and before the freezing of tasks.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Toshi Kani <toshi.kani@hp.com>

1 files changed, 12 insertions, 10 deletions

diff --git a/kernel/power/user.c b/kernel/power/user.c
index 4ed81e74f86f..63368163e98d 100644
--- a/kernel/power/user.c
+++ b/kernel/power/user.c
@@ -60,11 +60,6 @@ static int snapshot_open(struct inode *inode, struct file *filp)
 		error = -ENOSYS;
 		goto Unlock;
 	}
-	if(create_basic_memory_bitmaps()) {
-		atomic_inc(&snapshot_device_available);
-		error = -ENOMEM;
-		goto Unlock;
-	}
 	nonseekable_open(inode, filp);
 	data = &snapshot_state;
 	filp->private_data = data;
@@ -90,10 +85,9 @@ static int snapshot_open(struct inode *inode, struct file *filp)
 		if (error)
 			pm_notifier_call_chain(PM_POST_RESTORE);
 	}
-	if (error) {
-		free_basic_memory_bitmaps();
+	if (error)
 		atomic_inc(&snapshot_device_available);
-	}
+
 	data->frozen = 0;
 	data->ready = 0;
 	data->platform_support = 0;
@@ -111,11 +105,11 @@ static int snapshot_release(struct inode *inode, struct file *filp)
 	lock_system_sleep();
 
 	swsusp_free();
-	free_basic_memory_bitmaps();
 	data = filp->private_data;
 	free_all_swap_pages(data->swap);
 	if (data->frozen) {
 		pm_restore_gfp_mask();
+		free_basic_memory_bitmaps();
 		thaw_processes();
 	}
 	pm_notifier_call_chain(data->mode == O_RDONLY ?
@@ -220,14 +214,22 @@ static long snapshot_ioctl(struct file *filp, unsigned int cmd,
 		printk("done.\n");
 
 		error = freeze_processes();
-		if (!error)
+		if (error)
+			break;
+
+		error = create_basic_memory_bitmaps();
+		if (error)
+			thaw_processes();
+		else
 			data->frozen = 1;
+
 		break;
 
 	case SNAPSHOT_UNFREEZE:
 		if (!data->frozen || data->ready)
 			break;
 		pm_restore_gfp_mask();
+		free_basic_memory_bitmaps();
 		thaw_processes();
 		data->frozen = 0;
 		break;