Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/suspend-2.6

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/suspend-2.6: (26 commits)
  PM / Wakeup: Show wakeup sources statistics in debugfs
  PM: Introduce library for device-specific OPPs (v7)
  PM: Add sysfs attr for rechecking dev hash from PM trace
  PM: Lock PM device list mutex in show_dev_hash()
  PM / Runtime: Remove idle notification after failing suspend
  PM / Hibernate: Modify signature used to mark swap
  PM / Runtime: Reduce code duplication in core helper functions
  PM: Allow wakeup events to abort freezing of tasks
  PM: runtime: add missed pm_request_autosuspend
  PM / Hibernate: Make some boot messages look less scary
  PM / Runtime: Implement autosuspend support
  PM / Runtime: Add no_callbacks flag
  PM / Runtime: Combine runtime PM entry points
  PM / Runtime: Merge synchronous and async runtime routines
  PM / Runtime: Replace boolean arguments with bitflags
  PM / Runtime: Move code in drivers/base/power/runtime.c
  sysfs: Add sysfs_merge_group() and sysfs_unmerge_group()
  PM: Fix potential issue with failing asynchronous suspend
  PM / Wakeup: Introduce wakeup source objects and event statistics (v3)
  PM: Fix signed/unsigned warning in dpm_show_time()
  ...

7 files changed, 376 insertions, 29 deletions

diff --git a/kernel/power/Kconfig b/kernel/power/Kconfig
index ca6066a6952..29bff6117ab 100644
--- a/kernel/power/Kconfig
+++ b/kernel/power/Kconfig
@@ -86,6 +86,7 @@ config PM_SLEEP_SMP
 	depends on SMP
 	depends on ARCH_SUSPEND_POSSIBLE || ARCH_HIBERNATION_POSSIBLE
 	depends on PM_SLEEP
+	select HOTPLUG
 	select HOTPLUG_CPU
 	default y
 
@@ -137,6 +138,8 @@ config SUSPEND_FREEZER
 config HIBERNATION
 	bool "Hibernation (aka 'suspend to disk')"
 	depends on PM && SWAP && ARCH_HIBERNATION_POSSIBLE
+	select LZO_COMPRESS
+	select LZO_DECOMPRESS
 	select SUSPEND_NVS if HAS_IOMEM
 	---help---
 	  Enable the suspend to disk (STD) functionality, which is usually
@@ -242,3 +245,17 @@ config PM_OPS
 	bool
 	depends on PM_SLEEP || PM_RUNTIME
 	default y
+
+config PM_OPP
+	bool "Operating Performance Point (OPP) Layer library"
+	depends on PM
+	---help---
+	  SOCs have a standard set of tuples consisting of frequency and
+	  voltage pairs that the device will support per voltage domain. This
+	  is called Operating Performance Point or OPP. The actual definitions
+	  of OPP varies over silicon within the same family of devices.
+
+	  OPP layer organizes the data internally using device pointers
+	  representing individual voltage domains and provides SOC
+	  implementations a ready to use framework to manage OPPs.
+	  For more information, read <file:Documentation/power/opp.txt>
diff --git a/kernel/power/hibernate.c b/kernel/power/hibernate.c
index 8dc31e02ae1..657272e91d0 100644
--- a/kernel/power/hibernate.c
+++ b/kernel/power/hibernate.c
@@ -29,6 +29,7 @@
 #include "power.h"
 
 
+static int nocompress = 0;
 static int noresume = 0;
 static char resume_file[256] = CONFIG_PM_STD_PARTITION;
 dev_t swsusp_resume_device;
@@ -638,6 +639,8 @@ int hibernate(void)
 
 		if (hibernation_mode == HIBERNATION_PLATFORM)
 			flags |= SF_PLATFORM_MODE;
+		if (nocompress)
+			flags |= SF_NOCOMPRESS_MODE;
 		pr_debug("PM: writing image.\n");
 		error = swsusp_write(flags);
 		swsusp_free();
@@ -705,7 +708,7 @@ static int software_resume(void)
 		goto Unlock;
 	}
 
-	pr_debug("PM: Checking image partition %s\n", resume_file);
+	pr_debug("PM: Checking hibernation image partition %s\n", resume_file);
 
 	/* Check if the device is there */
 	swsusp_resume_device = name_to_dev_t(resume_file);
@@ -730,10 +733,10 @@ static int software_resume(void)
 	}
 
  Check_image:
-	pr_debug("PM: Resume from partition %d:%d\n",
+	pr_debug("PM: Hibernation image partition %d:%d present\n",
 		MAJOR(swsusp_resume_device), MINOR(swsusp_resume_device));
 
-	pr_debug("PM: Checking hibernation image.\n");
+	pr_debug("PM: Looking for hibernation image.\n");
 	error = swsusp_check();
 	if (error)
 		goto Unlock;
@@ -765,14 +768,14 @@ static int software_resume(void)
 		goto Done;
 	}
 
-	pr_debug("PM: Reading hibernation image.\n");
+	pr_debug("PM: Loading hibernation image.\n");
 
 	error = swsusp_read(&flags);
 	swsusp_close(FMODE_READ);
 	if (!error)
 		hibernation_restore(flags & SF_PLATFORM_MODE);
 
-	printk(KERN_ERR "PM: Restore failed, recovering.\n");
+	printk(KERN_ERR "PM: Failed to load hibernation image, recovering.\n");
 	swsusp_free();
 	thaw_processes();
  Done:
@@ -785,7 +788,7 @@ static int software_resume(void)
 	/* For success case, the suspend path will release the lock */
  Unlock:
 	mutex_unlock(&pm_mutex);
-	pr_debug("PM: Resume from disk failed.\n");
+	pr_debug("PM: Hibernation image not present or could not be loaded.\n");
 	return error;
 close_finish:
 	swsusp_close(FMODE_READ);
@@ -1004,6 +1007,15 @@ static int __init resume_offset_setup(char *str)
 	return 1;
 }
 
+static int __init hibernate_setup(char *str)
+{
+	if (!strncmp(str, "noresume", 8))
+		noresume = 1;
+	else if (!strncmp(str, "nocompress", 10))
+		nocompress = 1;
+	return 1;
+}
+
 static int __init noresume_setup(char *str)
 {
 	noresume = 1;
@@ -1013,3 +1025,4 @@ static int __init noresume_setup(char *str)
 __setup("noresume", noresume_setup);
 __setup("resume_offset=", resume_offset_setup);
 __setup("resume=", resume_setup);
+__setup("hibernate=", hibernate_setup);
diff --git a/kernel/power/main.c b/kernel/power/main.c
index 62b0bc6e498..7b5db6a8561 100644
--- a/kernel/power/main.c
+++ b/kernel/power/main.c
@@ -237,18 +237,18 @@ static ssize_t wakeup_count_show(struct kobject *kobj,
 				struct kobj_attribute *attr,
 				char *buf)
 {
-	unsigned long val;
+	unsigned int val;
 
-	return pm_get_wakeup_count(&val) ? sprintf(buf, "%lu\n", val) : -EINTR;
+	return pm_get_wakeup_count(&val) ? sprintf(buf, "%u\n", val) : -EINTR;
 }
 
 static ssize_t wakeup_count_store(struct kobject *kobj,
 				struct kobj_attribute *attr,
 				const char *buf, size_t n)
 {
-	unsigned long val;
+	unsigned int val;
 
-	if (sscanf(buf, "%lu", &val) == 1) {
+	if (sscanf(buf, "%u", &val) == 1) {
 		if (pm_save_wakeup_count(val))
 			return n;
 	}
@@ -281,12 +281,30 @@ pm_trace_store(struct kobject *kobj, struct kobj_attribute *attr,
 }
 
 power_attr(pm_trace);
+
+static ssize_t pm_trace_dev_match_show(struct kobject *kobj,
+				       struct kobj_attribute *attr,
+				       char *buf)
+{
+	return show_trace_dev_match(buf, PAGE_SIZE);
+}
+
+static ssize_t
+pm_trace_dev_match_store(struct kobject *kobj, struct kobj_attribute *attr,
+			 const char *buf, size_t n)
+{
+	return -EINVAL;
+}
+
+power_attr(pm_trace_dev_match);
+
 #endif /* CONFIG_PM_TRACE */
 
 static struct attribute * g[] = {
 	&state_attr.attr,
 #ifdef CONFIG_PM_TRACE
 	&pm_trace_attr.attr,
+	&pm_trace_dev_match_attr.attr,
 #endif
 #ifdef CONFIG_PM_SLEEP
 	&pm_async_attr.attr,
@@ -308,7 +326,7 @@ EXPORT_SYMBOL_GPL(pm_wq);
 
 static int __init pm_start_workqueue(void)
 {
-	pm_wq = create_freezeable_workqueue("pm");
+	pm_wq = alloc_workqueue("pm", WQ_FREEZEABLE, 0);
 
 	return pm_wq ? 0 : -ENOMEM;
 }
@@ -321,6 +339,7 @@ static int __init pm_init(void)
 	int error = pm_start_workqueue();
 	if (error)
 		return error;
+	hibernate_image_size_init();
 	power_kobj = kobject_create_and_add("power", NULL);
 	if (!power_kobj)
 		return -ENOMEM;
diff --git a/kernel/power/power.h b/kernel/power/power.h
index 006270fe382..03634be55f6 100644
--- a/kernel/power/power.h
+++ b/kernel/power/power.h
@@ -14,6 +14,9 @@ struct swsusp_info {
 } __attribute__((aligned(PAGE_SIZE)));
 
 #ifdef CONFIG_HIBERNATION
+/* kernel/power/snapshot.c */
+extern void __init hibernate_image_size_init(void);
+
 #ifdef CONFIG_ARCH_HIBERNATION_HEADER
 /* Maximum size of architecture specific data in a hibernation header */
 #define MAX_ARCH_HEADER_SIZE	(sizeof(struct new_utsname) + 4)
@@ -49,7 +52,11 @@ static inline char *check_image_kernel(struct swsusp_info *info)
 extern int hibernation_snapshot(int platform_mode);
 extern int hibernation_restore(int platform_mode);
 extern int hibernation_platform_enter(void);
-#endif
+
+#else /* !CONFIG_HIBERNATION */
+
+static inline void hibernate_image_size_init(void) {}
+#endif /* !CONFIG_HIBERNATION */
 
 extern int pfn_is_nosave(unsigned long);
 
@@ -134,6 +141,7 @@ extern int swsusp_swap_in_use(void);
  * the image header.
  */
 #define SF_PLATFORM_MODE	1
+#define SF_NOCOMPRESS_MODE	2
 
 /* kernel/power/hibernate.c */
 extern int swsusp_check(void);
diff --git a/kernel/power/process.c b/kernel/power/process.c
index 028a99598f4..e50b4c1b2a0 100644
--- a/kernel/power/process.c
+++ b/kernel/power/process.c
@@ -40,6 +40,7 @@ static int try_to_freeze_tasks(bool sig_only)
 	struct timeval start, end;
 	u64 elapsed_csecs64;
 	unsigned int elapsed_csecs;
+	bool wakeup = false;
 
 	do_gettimeofday(&start);
 
@@ -78,6 +79,11 @@ static int try_to_freeze_tasks(bool sig_only)
 		if (!todo || time_after(jiffies, end_time))
 			break;
 
+		if (!pm_check_wakeup_events()) {
+			wakeup = true;
+			break;
+		}
+
 		/*
 		 * We need to retry, but first give the freezing tasks some
 		 * time to enter the regrigerator.
@@ -97,8 +103,9 @@ static int try_to_freeze_tasks(bool sig_only)
 		 * but it cleans up leftover PF_FREEZE requests.
 		 */
 		printk("\n");
-		printk(KERN_ERR "Freezing of tasks failed after %d.%02d seconds "
+		printk(KERN_ERR "Freezing of tasks %s after %d.%02d seconds "
 		       "(%d tasks refusing to freeze, wq_busy=%d):\n",
+		       wakeup ? "aborted" : "failed",
 		       elapsed_csecs / 100, elapsed_csecs % 100,
 		       todo - wq_busy, wq_busy);
 
@@ -107,7 +114,7 @@ static int try_to_freeze_tasks(bool sig_only)
 		read_lock(&tasklist_lock);
 		do_each_thread(g, p) {
 			task_lock(p);
-			if (freezing(p) && !freezer_should_skip(p))
+			if (!wakeup && freezing(p) && !freezer_should_skip(p))
 				sched_show_task(p);
 			cancel_freezing(p);
 			task_unlock(p);
diff --git a/kernel/power/snapshot.c b/kernel/power/snapshot.c
index d3f795f01bb..ac7eb109f19 100644
--- a/kernel/power/snapshot.c
+++ b/kernel/power/snapshot.c
@@ -46,7 +46,12 @@ static void swsusp_unset_page_forbidden(struct page *);
  * size will not exceed N bytes, but if that is impossible, it will
  * try to create the smallest image possible.
  */
-unsigned long image_size = 500 * 1024 * 1024;
+unsigned long image_size;
+
+void __init hibernate_image_size_init(void)
+{
+	image_size = ((totalram_pages * 2) / 5) * PAGE_SIZE;
+}
 
 /* List of PBEs needed for restoring the pages that were allocated before
  * the suspend and included in the suspend image, but have also been
@@ -1318,12 +1323,14 @@ int hibernate_preallocate_memory(void)
 
 	/* Compute the maximum number of saveable pages to leave in memory. */
 	max_size = (count - (size + PAGES_FOR_IO)) / 2 - 2 * SPARE_PAGES;
+	/* Compute the desired number of image pages specified by image_size. */
 	size = DIV_ROUND_UP(image_size, PAGE_SIZE);
 	if (size > max_size)
 		size = max_size;
 	/*
-	 * If the maximum is not less than the current number of saveable pages
-	 * in memory, allocate page frames for the image and we're done.
+	 * If the desired number of image pages is at least as large as the
+	 * current number of saveable pages in memory, allocate page frames for
+	 * the image and we're done.
 	 */
 	if (size >= saveable) {
 		pages = preallocate_image_highmem(save_highmem);
diff --git a/kernel/power/swap.c b/kernel/power/swap.c
index e6a5bdf61a3..916eaa79039 100644
--- a/kernel/power/swap.c
+++ b/kernel/power/swap.c
@@ -24,10 +24,12 @@
 #include <linux/swapops.h>
 #include <linux/pm.h>
 #include <linux/slab.h>
+#include <linux/lzo.h>
+#include <linux/vmalloc.h>
 
 #include "power.h"
 
-#define SWSUSP_SIG	"S1SUSPEND"
+#define HIBERNATE_SIG	"LINHIB0001"
 
 /*
  *	The swap map is a data structure used for keeping track of each page
@@ -193,7 +195,7 @@ static int mark_swapfiles(struct swap_map_handle *handle, unsigned int flags)
 	if (!memcmp("SWAP-SPACE",swsusp_header->sig, 10) ||
 	    !memcmp("SWAPSPACE2",swsusp_header->sig, 10)) {
 		memcpy(swsusp_header->orig_sig,swsusp_header->sig, 10);
-		memcpy(swsusp_header->sig,SWSUSP_SIG, 10);
+		memcpy(swsusp_header->sig, HIBERNATE_SIG, 10);
 		swsusp_header->image = handle->first_sector;
 		swsusp_header->flags = flags;
 		error = hib_bio_write_page(swsusp_resume_block,
@@ -357,6 +359,18 @@ static int swap_writer_finish(struct swap_map_handle *handle,
 	return error;
 }
 
+/* We need to remember how much compressed data we need to read. */
+#define LZO_HEADER	sizeof(size_t)
+
+/* Number of pages/bytes we'll compress at one time. */
+#define LZO_UNC_PAGES	32
+#define LZO_UNC_SIZE	(LZO_UNC_PAGES * PAGE_SIZE)
+
+/* Number of pages/bytes we need for compressed data (worst case). */
+#define LZO_CMP_PAGES	DIV_ROUND_UP(lzo1x_worst_compress(LZO_UNC_SIZE) + \
+			             LZO_HEADER, PAGE_SIZE)
+#define LZO_CMP_SIZE	(LZO_CMP_PAGES * PAGE_SIZE)
+
 /**
  *	save_image - save the suspend image data
  */
@@ -404,6 +418,137 @@ static int save_image(struct swap_map_handle *handle,
 	return ret;
 }
 
+
+/**
+ * save_image_lzo - Save the suspend image data compressed with LZO.
+ * @handle: Swap mam handle to use for saving the image.
+ * @snapshot: Image to read data from.
+ * @nr_to_write: Number of pages to save.
+ */
+static int save_image_lzo(struct swap_map_handle *handle,
+                          struct snapshot_handle *snapshot,
+                          unsigned int nr_to_write)
+{
+	unsigned int m;
+	int ret = 0;
+	int nr_pages;
+	int err2;
+	struct bio *bio;
+	struct timeval start;
+	struct timeval stop;
+	size_t off, unc_len, cmp_len;
+	unsigned char *unc, *cmp, *wrk, *page;
+
+	page = (void *)__get_free_page(__GFP_WAIT | __GFP_HIGH);
+	if (!page) {
+		printk(KERN_ERR "PM: Failed to allocate LZO page\n");
+		return -ENOMEM;
+	}
+
+	wrk = vmalloc(LZO1X_1_MEM_COMPRESS);
+	if (!wrk) {
+		printk(KERN_ERR "PM: Failed to allocate LZO workspace\n");
+		free_page((unsigned long)page);
+		return -ENOMEM;
+	}
+
+	unc = vmalloc(LZO_UNC_SIZE);
+	if (!unc) {
+		printk(KERN_ERR "PM: Failed to allocate LZO uncompressed\n");
+		vfree(wrk);
+		free_page((unsigned long)page);
+		return -ENOMEM;
+	}
+
+	cmp = vmalloc(LZO_CMP_SIZE);
+	if (!cmp) {
+		printk(KERN_ERR "PM: Failed to allocate LZO compressed\n");
+		vfree(unc);
+		vfree(wrk);
+		free_page((unsigned long)page);
+		return -ENOMEM;
+	}
+
+	printk(KERN_INFO
+		"PM: Compressing and saving image data (%u pages) ...     ",
+		nr_to_write);
+	m = nr_to_write / 100;
+	if (!m)
+		m = 1;
+	nr_pages = 0;
+	bio = NULL;
+	do_gettimeofday(&start);
+	for (;;) {
+		for (off = 0; off < LZO_UNC_SIZE; off += PAGE_SIZE) {
+			ret = snapshot_read_next(snapshot);
+			if (ret < 0)
+				goto out_finish;
+
+			if (!ret)
+				break;
+
+			memcpy(unc + off, data_of(*snapshot), PAGE_SIZE);
+
+			if (!(nr_pages % m))
+				printk(KERN_CONT "\b\b\b\b%3d%%", nr_pages / m);
+			nr_pages++;
+		}
+
+		if (!off)
+			break;
+
+		unc_len = off;
+		ret = lzo1x_1_compress(unc, unc_len,
+		                       cmp + LZO_HEADER, &cmp_len, wrk);
+		if (ret < 0) {
+			printk(KERN_ERR "PM: LZO compression failed\n");
+			break;
+		}
+
+		if (unlikely(!cmp_len ||
+		             cmp_len > lzo1x_worst_compress(unc_len))) {
+			printk(KERN_ERR "PM: Invalid LZO compressed length\n");
+			ret = -1;
+			break;
+		}
+
+		*(size_t *)cmp = cmp_len;
+
+		/*
+		 * Given we are writing one page at a time to disk, we copy
+		 * that much from the buffer, although the last bit will likely
+		 * be smaller than full page. This is OK - we saved the length
+		 * of the compressed data, so any garbage at the end will be
+		 * discarded when we read it.
+		 */
+		for (off = 0; off < LZO_HEADER + cmp_len; off += PAGE_SIZE) {
+			memcpy(page, cmp + off, PAGE_SIZE);
+
+			ret = swap_write_page(handle, page, &bio);
+			if (ret)
+				goto out_finish;
+		}
+	}
+
+out_finish:
+	err2 = hib_wait_on_bio_chain(&bio);
+	do_gettimeofday(&stop);
+	if (!ret)
+		ret = err2;
+	if (!ret)
+		printk(KERN_CONT "\b\b\b\bdone\n");
+	else
+		printk(KERN_CONT "\n");
+	swsusp_show_speed(&start, &stop, nr_to_write, "Wrote");
+
+	vfree(cmp);
+	vfree(unc);
+	vfree(wrk);
+	free_page((unsigned long)page);
+
+	return ret;
+}
+
 /**
  *	enough_swap - Make sure we have enough swap to save the image.
  *
@@ -411,12 +556,16 @@ static int save_image(struct swap_map_handle *handle,
  *	space avaiable from the resume partition.
  */
 
-static int enough_swap(unsigned int nr_pages)
+static int enough_swap(unsigned int nr_pages, unsigned int flags)
 {
 	unsigned int free_swap = count_swap_pages(root_swap, 1);
+	unsigned int required;
 
 	pr_debug("PM: Free swap pages: %u\n", free_swap);
-	return free_swap > nr_pages + PAGES_FOR_IO;
+
+	required = PAGES_FOR_IO + ((flags & SF_NOCOMPRESS_MODE) ?
+		nr_pages : (nr_pages * LZO_CMP_PAGES) / LZO_UNC_PAGES + 1);
+	return free_swap > required;
 }
 
 /**
@@ -443,7 +592,7 @@ int swsusp_write(unsigned int flags)
 		printk(KERN_ERR "PM: Cannot get swap writer\n");
 		return error;
 	}
-	if (!enough_swap(pages)) {
+	if (!enough_swap(pages, flags)) {
 		printk(KERN_ERR "PM: Not enough free swap\n");
 		error = -ENOSPC;
 		goto out_finish;
@@ -458,8 +607,11 @@ int swsusp_write(unsigned int flags)
 	}
 	header = (struct swsusp_info *)data_of(snapshot);
 	error = swap_write_page(&handle, header, NULL);
-	if (!error)
-		error = save_image(&handle, &snapshot, pages - 1);
+	if (!error) {
+		error = (flags & SF_NOCOMPRESS_MODE) ?
+			save_image(&handle, &snapshot, pages - 1) :
+			save_image_lzo(&handle, &snapshot, pages - 1);
+	}
 out_finish:
 	error = swap_writer_finish(&handle, flags, error);
 	return error;
@@ -590,6 +742,127 @@ static int load_image(struct swap_map_handle *handle,
 }
 
 /**
+ * load_image_lzo - Load compressed image data and decompress them with LZO.
+ * @handle: Swap map handle to use for loading data.
+ * @snapshot: Image to copy uncompressed data into.
+ * @nr_to_read: Number of pages to load.
+ */
+static int load_image_lzo(struct swap_map_handle *handle,
+                          struct snapshot_handle *snapshot,
+                          unsigned int nr_to_read)
+{
+	unsigned int m;
+	int error = 0;
+	struct timeval start;
+	struct timeval stop;
+	unsigned nr_pages;
+	size_t off, unc_len, cmp_len;
+	unsigned char *unc, *cmp, *page;
+
+	page = (void *)__get_free_page(__GFP_WAIT | __GFP_HIGH);
+	if (!page) {
+		printk(KERN_ERR "PM: Failed to allocate LZO page\n");
+		return -ENOMEM;
+	}
+
+	unc = vmalloc(LZO_UNC_SIZE);
+	if (!unc) {
+		printk(KERN_ERR "PM: Failed to allocate LZO uncompressed\n");
+		free_page((unsigned long)page);
+		return -ENOMEM;
+	}
+
+	cmp = vmalloc(LZO_CMP_SIZE);
+	if (!cmp) {
+		printk(KERN_ERR "PM: Failed to allocate LZO compressed\n");
+		vfree(unc);
+		free_page((unsigned long)page);
+		return -ENOMEM;
+	}
+
+	printk(KERN_INFO
+		"PM: Loading and decompressing image data (%u pages) ...     ",
+		nr_to_read);
+	m = nr_to_read / 100;
+	if (!m)
+		m = 1;
+	nr_pages = 0;
+	do_gettimeofday(&start);
+
+	error = snapshot_write_next(snapshot);
+	if (error <= 0)
+		goto out_finish;
+
+	for (;;) {
+		error = swap_read_page(handle, page, NULL); /* sync */
+		if (error)
+			break;
+
+		cmp_len = *(size_t *)page;
+		if (unlikely(!cmp_len ||
+		             cmp_len > lzo1x_worst_compress(LZO_UNC_SIZE))) {
+			printk(KERN_ERR "PM: Invalid LZO compressed length\n");
+			error = -1;
+			break;
+		}
+
+		memcpy(cmp, page, PAGE_SIZE);
+		for (off = PAGE_SIZE; off < LZO_HEADER + cmp_len; off += PAGE_SIZE) {
+			error = swap_read_page(handle, page, NULL); /* sync */
+			if (error)
+				goto out_finish;
+
+			memcpy(cmp + off, page, PAGE_SIZE);
+		}
+
+		unc_len = LZO_UNC_SIZE;
+		error = lzo1x_decompress_safe(cmp + LZO_HEADER, cmp_len,
+		                              unc, &unc_len);
+		if (error < 0) {
+			printk(KERN_ERR "PM: LZO decompression failed\n");
+			break;
+		}
+
+		if (unlikely(!unc_len ||
+		             unc_len > LZO_UNC_SIZE ||
+		             unc_len & (PAGE_SIZE - 1))) {
+			printk(KERN_ERR "PM: Invalid LZO uncompressed length\n");
+			error = -1;
+			break;
+		}
+
+		for (off = 0; off < unc_len; off += PAGE_SIZE) {
+			memcpy(data_of(*snapshot), unc + off, PAGE_SIZE);
+
+			if (!(nr_pages % m))
+				printk("\b\b\b\b%3d%%", nr_pages / m);
+			nr_pages++;
+
+			error = snapshot_write_next(snapshot);
+			if (error <= 0)
+				goto out_finish;
+		}
+	}
+
+out_finish:
+	do_gettimeofday(&stop);
+	if (!error) {
+		printk("\b\b\b\bdone\n");
+		snapshot_write_finalize(snapshot);
+		if (!snapshot_image_loaded(snapshot))
+			error = -ENODATA;
+	} else
+		printk("\n");
+	swsusp_show_speed(&start, &stop, nr_to_read, "Read");
+
+	vfree(cmp);
+	vfree(unc);
+	free_page((unsigned long)page);
+
+	return error;
+}
+
+/**
  *	swsusp_read - read the hibernation image.
  *	@flags_p: flags passed by the "frozen" kernel in the image header should
  *		  be written into this memeory location
@@ -612,8 +885,11 @@ int swsusp_read(unsigned int *flags_p)
 		goto end;
 	if (!error)
 		error = swap_read_page(&handle, header, NULL);
-	if (!error)
-		error = load_image(&handle, &snapshot, header->pages - 1);
+	if (!error) {
+		error = (*flags_p & SF_NOCOMPRESS_MODE) ?
+			load_image(&handle, &snapshot, header->pages - 1) :
+			load_image_lzo(&handle, &snapshot, header->pages - 1);
+	}
 	swap_reader_finish(&handle);
 end:
 	if (!error)
@@ -640,7 +916,7 @@ int swsusp_check(void)
 		if (error)
 			goto put;
 
-		if (!memcmp(SWSUSP_SIG, swsusp_header->sig, 10)) {
+		if (!memcmp(HIBERNATE_SIG, swsusp_header->sig, 10)) {
 			memcpy(swsusp_header->sig, swsusp_header->orig_sig, 10);
 			/* Reset swap signature now */
 			error = hib_bio_write_page(swsusp_resume_block,
@@ -653,13 +929,13 @@ put:
 		if (error)
 			blkdev_put(hib_resume_bdev, FMODE_READ);
 		else
-			pr_debug("PM: Signature found, resuming\n");
+			pr_debug("PM: Image signature found, resuming\n");
 	} else {
 		error = PTR_ERR(hib_resume_bdev);
 	}
 
 	if (error)
-		pr_debug("PM: Error %d checking image file\n", error);
+		pr_debug("PM: Image not found (code %d)\n", error);
 
 	return error;
 }