[PATCH] PM: HIBERNATION: add resume_delay kernel param as well as resume_delay

[Barry Song <Barry.Song@csr.com>]

From: Barry Song <baohua.song@csr.com>

patch "PM: HIBERNATION: add resume_wait param to support MMC-like devices
as resume file" add resume_wait param. this patch adds resume_delay so that
resume_wait/delay has the same model with root_wait/delay.

Signed-off-by: Barry Song <baohua.song@csr.com>
---
 Documentation/kernel-parameters.txt |    3 +++
 kernel/power/hibernate.c            |   14 ++++++++++++++
 2 files changed, 17 insertions(+), 0 deletions(-)

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 88a7b19..831bde2 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -2240,6 +2240,9 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
 			in <PAGE_SIZE> units (needed only for swap files).
 			See  Documentation/power/swsusp-and-swap-files.txt
 
+	resumedelay=	[HIBERNATION] Delay (in seconds) to pause before attempting to
+			read the resume files
+
 	resumewait	[HIBERNATION] Wait (indefinitely) for resume device to show up.
 			Useful for devices that are detected asynchronously
 			(e.g. USB and MMC devices).
diff --git a/kernel/power/hibernate.c b/kernel/power/hibernate.c
index b3da53c..f73a00e 100644
--- a/kernel/power/hibernate.c
+++ b/kernel/power/hibernate.c
@@ -33,6 +33,7 @@
 static int nocompress = 0;
 static int noresume = 0;
 static int resume_wait = 0;
+static int resume_delay = 0;
 static char resume_file[256] = CONFIG_PM_STD_PARTITION;
 dev_t swsusp_resume_device;
 sector_t swsusp_resume_block;
@@ -726,6 +727,12 @@ 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) {
@@ -1075,8 +1082,15 @@ static int __init resumewait_setup(char *str)
 	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);
-- 
1.7.1



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