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>
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@ -644,22 +644,22 @@ int hibernate(void)
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if (error)
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goto Exit;
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/* Allocate memory management structures */
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error = create_basic_memory_bitmaps();
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if (error)
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goto Exit;
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printk(KERN_INFO "PM: Syncing filesystems ... ");
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sys_sync();
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printk("done.\n");
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error = freeze_processes();
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if (error)
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goto Free_bitmaps;
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goto Exit;
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/* Allocate memory management structures */
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error = create_basic_memory_bitmaps();
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if (error)
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goto Thaw;
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error = hibernation_snapshot(hibernation_mode == HIBERNATION_PLATFORM);
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if (error || freezer_test_done)
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goto Thaw;
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goto Free_bitmaps;
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if (in_suspend) {
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unsigned int flags = 0;
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@ -682,14 +682,13 @@ int hibernate(void)
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pr_debug("PM: Image restored successfully.\n");
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}
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Free_bitmaps:
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free_basic_memory_bitmaps();
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Thaw:
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thaw_processes();
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/* Don't bother checking whether freezer_test_done is true */
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freezer_test_done = false;
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Free_bitmaps:
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free_basic_memory_bitmaps();
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Exit:
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pm_notifier_call_chain(PM_POST_HIBERNATION);
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pm_restore_console();
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@ -806,21 +805,19 @@ static int software_resume(void)
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pm_prepare_console();
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error = pm_notifier_call_chain(PM_RESTORE_PREPARE);
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if (error)
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goto close_finish;
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error = create_basic_memory_bitmaps();
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if (error)
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goto close_finish;
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goto Close_Finish;
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pr_debug("PM: Preparing processes for restore.\n");
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error = freeze_processes();
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if (error) {
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swsusp_close(FMODE_READ);
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goto Done;
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}
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if (error)
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goto Close_Finish;
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pr_debug("PM: Loading hibernation image.\n");
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error = create_basic_memory_bitmaps();
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if (error)
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goto Thaw;
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error = swsusp_read(&flags);
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swsusp_close(FMODE_READ);
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if (!error)
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@ -828,9 +825,9 @@ static int software_resume(void)
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printk(KERN_ERR "PM: Failed to load hibernation image, recovering.\n");
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swsusp_free();
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thaw_processes();
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Done:
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free_basic_memory_bitmaps();
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Thaw:
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thaw_processes();
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Finish:
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pm_notifier_call_chain(PM_POST_RESTORE);
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pm_restore_console();
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@ -840,7 +837,7 @@ static int software_resume(void)
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mutex_unlock(&pm_mutex);
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pr_debug("PM: Hibernation image not present or could not be loaded.\n");
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return error;
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close_finish:
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Close_Finish:
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swsusp_close(FMODE_READ);
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goto Finish;
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}
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@ -60,11 +60,6 @@ static int snapshot_open(struct inode *inode, struct file *filp)
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error = -ENOSYS;
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goto Unlock;
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}
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if(create_basic_memory_bitmaps()) {
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atomic_inc(&snapshot_device_available);
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error = -ENOMEM;
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goto Unlock;
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}
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nonseekable_open(inode, filp);
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data = &snapshot_state;
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filp->private_data = data;
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@ -90,10 +85,9 @@ static int snapshot_open(struct inode *inode, struct file *filp)
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if (error)
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pm_notifier_call_chain(PM_POST_RESTORE);
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}
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if (error) {
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free_basic_memory_bitmaps();
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if (error)
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atomic_inc(&snapshot_device_available);
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}
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data->frozen = 0;
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data->ready = 0;
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data->platform_support = 0;
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@ -111,11 +105,11 @@ static int snapshot_release(struct inode *inode, struct file *filp)
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lock_system_sleep();
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swsusp_free();
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free_basic_memory_bitmaps();
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data = filp->private_data;
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free_all_swap_pages(data->swap);
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if (data->frozen) {
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pm_restore_gfp_mask();
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free_basic_memory_bitmaps();
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thaw_processes();
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}
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pm_notifier_call_chain(data->mode == O_RDONLY ?
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@ -220,14 +214,22 @@ static long snapshot_ioctl(struct file *filp, unsigned int cmd,
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printk("done.\n");
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error = freeze_processes();
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if (!error)
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if (error)
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break;
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error = create_basic_memory_bitmaps();
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if (error)
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thaw_processes();
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else
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data->frozen = 1;
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break;
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case SNAPSHOT_UNFREEZE:
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if (!data->frozen || data->ready)
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break;
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pm_restore_gfp_mask();
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free_basic_memory_bitmaps();
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thaw_processes();
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data->frozen = 0;
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break;
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