linux-kernel - [RFC/PATCH] PM / Hibernate : Add wait for disk detection if resume

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Date:	Mon, 07 May 2012 17:26:12 +0900
From:	Minho Ban <mhban@...sung.com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Len Brown <len.brown@...el.com>, Pavel Machek <pavel@....cz>,
	linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [RFC/PATCH] PM / Hibernate : Add wait for disk detection if
 resume_file is MAJOR:MINOR style

name_to_dev_t is not enough to check device detection when the resume_file is
MAJOR:MINOR format. get_gendisk is needed in that case.

Signed-off-by: Minho Ban <mhban@...sung.com>
---
 kernel/power/hibernate.c |   10 ++++++++++
 1 files changed, 10 insertions(+), 0 deletions(-)

diff --git a/kernel/power/hibernate.c b/kernel/power/hibernate.c
index e09dfbf..27efaef 100644
--- a/kernel/power/hibernate.c
+++ b/kernel/power/hibernate.c
@@ -25,6 +25,8 @@
 #include <linux/freezer.h>
 #include <linux/gfp.h>
 #include <linux/syscore_ops.h>
+#include <linux/ctype.h>
+#include <linux/genhd.h>
 #include <scsi/scsi_scan.h>
 
 #include "power.h"
@@ -749,6 +751,14 @@ static int software_resume(void)
 		}
 	}
 
+	/* name_to_dev_t is ineffective if resume_file comes in major:minor
+	 * format */
+	if (isdigit(resume_file[0]) && resume_wait) {
+		int partno;
+		while (!get_gendisk(swsusp_resume_device, &partno))
+			msleep(10);
+	}
+
  Check_image:
 	pr_debug("PM: Hibernation image partition %d:%d present\n",
 		MAJOR(swsusp_resume_device), MINOR(swsusp_resume_device));
-- 
1.7.5.4

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