linux-kernel - [4.1-rc1][Hibernation failed] bisect result included

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Date:	Sun, 3 May 2015 15:54:39 +0000
From:	"Chen, Yu C" <yu.c.chen@...el.com>
To:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	"Wysocki, Rafael J" <rafael.j.wysocki@...el.com>,
	"dehrenberg@...omium.org" <dehrenberg@...omium.org>,
	"Zhang, Rui" <rui.zhang@...el.com>,
	"Lu, Aaron" <aaron.lu@...el.com>
Subject: [4.1-rc1][Hibernation failed]  bisect result  included

Hi,all,
When we are doing QA test, a hibernation failor was found on latest kernel 4.1-rc1,
resume from hibernation failed with the following error:

PM: Hibernation image not present or could not be loaded.

Bisect shows following commit might trigger this problem:
commit 283e7ad0241155710f99a9f39d13313a53336926

The  reason for failor is that, some distribution use klibc in initrd
to restore the image, and klibc will provide kernel with the device 
format of major:minor:offset,
for example, 8:3:0 represents a swap partition, and klibc will
echo 8:3:0 > /sys/power/resume to resume the system manually.
However in current implementation, format of 8:3:0 will be regarded 
as an invalid device, so restoring from hibernation failed.

Do we need to add support for device format like 8:3:0?
I'm happy to debug more specifically if you can let me know what 
would be of use, and I've also attached a temporary patch 
for this problem, not sure if it is suitable,  thanks.

Best Regards,
Yu

Download attachment "0001-init-support-device-of-major-minor-offset-format.patch" of type "application/octet-stream" (1601 bytes)