Merge branch 'next' into for-linus

1 files changed, 63 insertions, 14 deletions

diff --git a/kernel/power/hibernate.c b/kernel/power/hibernate.c
index 8f7b1db1ece1..196c01268ebd 100644
--- a/kernel/power/hibernate.c
+++ b/kernel/power/hibernate.c
@@ -9,11 +9,13 @@
  * This file is released under the GPLv2.
  */
 
+#include <linux/export.h>
 #include <linux/suspend.h>
 #include <linux/syscalls.h>
 #include <linux/reboot.h>
 #include <linux/string.h>
 #include <linux/device.h>
+#include <linux/async.h>
 #include <linux/kmod.h>
 #include <linux/delay.h>
 #include <linux/fs.h>
@@ -29,12 +31,14 @@
 #include "power.h"
 
 
-static int nocompress = 0;
-static int noresume = 0;
+static int nocompress;
+static int noresume;
+static int resume_wait;
+static int resume_delay;
 static char resume_file[256] = CONFIG_PM_STD_PARTITION;
 dev_t swsusp_resume_device;
 sector_t swsusp_resume_block;
-int in_suspend __nosavedata = 0;
+int in_suspend __nosavedata;
 
 enum {
         HIBERNATION_INVALID,
@@ -51,6 +55,8 @@ enum {
 
 static int hibernation_mode = HIBERNATION_SHUTDOWN;
 
+static bool freezer_test_done;
+
 static const struct platform_hibernation_ops *hibernation_ops;
 
 /**
@@ -334,13 +340,28 @@ int hibernation_snapshot(int platform_mode)
         if (error)
                 goto Close;
 
-        error = dpm_prepare(PMSG_FREEZE);
-        if (error)
-                goto Complete_devices;
-
         /* Preallocate image memory before shutting down devices. */
         error = hibernate_preallocate_memory();
         if (error)
+                goto Close;
+
+        error = freeze_kernel_threads();
+        if (error)
+                goto Close;
+
+        if (hibernation_test(TEST_FREEZER) ||
+                hibernation_testmode(HIBERNATION_TESTPROC)) {
+
+                /*
+                 * Indicate to the caller that we are returning due to a
+                 * successful freezer test.
+                 */
+                freezer_test_done = true;
+                goto Close;
+        }
+
+        error = dpm_prepare(PMSG_FREEZE);
+        if (error)
                 goto Complete_devices;
 
         suspend_console();
@@ -463,7 +484,7 @@ static int resume_target_kernel(bool platform_mode)
  * @platform_mode: If set, use platform driver to prepare for the transition.
  *
  * This routine must be called with pm_mutex held.  If it is successful, control
- * reappears in the restored target kernel in hibernation_snaphot().
+ * reappears in the restored target kernel in hibernation_snapshot().
  */
 int hibernation_restore(int platform_mode)
 {
@@ -633,15 +654,13 @@ int hibernate(void)
         if (error)
                 goto Finish;
 
-        if (hibernation_test(TEST_FREEZER))
-                goto Thaw;
-
-        if (hibernation_testmode(HIBERNATION_TESTPROC))
-                goto Thaw;
-
         error = hibernation_snapshot(hibernation_mode == HIBERNATION_PLATFORM);
         if (error)
                 goto Thaw;
+        if (freezer_test_done) {
+                freezer_test_done = false;
+                goto Thaw;
+        }
 
         if (in_suspend) {
                 unsigned int flags = 0;
@@ -650,6 +669,9 @@ int hibernate(void)
                         flags |= SF_PLATFORM_MODE;
                 if (nocompress)
                         flags |= SF_NOCOMPRESS_MODE;
+                else
+                        flags |= SF_CRC32_MODE;
+
                 pr_debug("PM: writing image.\n");
                 error = swsusp_write(flags);
                 swsusp_free();
@@ -724,6 +746,12 @@ static int software_resume(void)
 
         pr_debug("PM: Checking hibernation image partition %s\n", resume_file);
 
+        if (resume_delay) {
+                printk(KERN_INFO "Waiting %dsec before reading resume device...\n",
+                        resume_delay);
+                ssleep(resume_delay);
+        }
+
         /* Check if the device is there */
         swsusp_resume_device = name_to_dev_t(resume_file);
         if (!swsusp_resume_device) {
@@ -732,6 +760,13 @@ static int software_resume(void)
                  * to wait for this to finish.
                  */
                 wait_for_device_probe();
+
+                if (resume_wait) {
+                        while ((swsusp_resume_device = name_to_dev_t(resume_file)) == 0)
+                                msleep(10);
+                        async_synchronize_full();
+                }
+
                 /*
                  * We can't depend on SCSI devices being available after loading
                  * one of their modules until scsi_complete_async_scans() is
@@ -1060,7 +1095,21 @@ static int __init noresume_setup(char *str)
         return 1;
 }
 
+static int __init resumewait_setup(char *str)
+{
+        resume_wait = 1;
+        return 1;
+}
+
+static int __init resumedelay_setup(char *str)
+{
+        resume_delay = simple_strtoul(str, NULL, 0);
+        return 1;
+}
+
 __setup("noresume", noresume_setup);
 __setup("resume_offset=", resume_offset_setup);
 __setup("resume=", resume_setup);
 __setup("hibernate=", hibernate_setup);
+__setup("resumewait", resumewait_setup);
+__setup("resumedelay=", resumedelay_setup);