linux-kernel - suspend-to-disk using a SAS drive

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Date:	Sun, 05 Aug 2007 18:36:03 -0700
From:	Nevine AbouGhazaleh <nevine@...pitt.edu>
To:	linux-kernel@...r.kernel.org
Subject: suspend-to-disk using a SAS drive

I am trying to suspend-to-disk using the Suspend2 modules. I am using an SSD drive connected through a SAS bus interface. The SSD acts as a boot disk.
All read and write transactions to the drive works well during normal operation.  
when I hibernate (suspend-to-disk).

I get the following errors:
------------------
mptbase: ioc0: ERROR – Invalid IOC facts reply, msgLength=0 offset=6
pnp: Failed to activate device 00:09.
pnp: Failed to activate device 00:0a.
------------

Immediately after these messages, Linux hangs as soon as it starts writing the image to the drive. showing the following output.
------------------
Writing Kernel and process data ...
20%...
------------------

When using KDB to trace the problem after the kernel hung.

<ps> shows a running process: Ks2io

when doing Back Trace for Ks2io wheen the kernel hangs, I get the following trace
--------------------
_spin_unlock_irq+0xb
thread_return+0x64
_raw_spin_lock+ox90
__mutex_up_process+0x10
wake_up_process+0x10
suspend_bio_write_page
mutex_lock+0x2a
flush_workqueue+0x51
kblockd_flush+0x10
do_bio_wait+0x1b
suspend_bio_write_page
suepend_bio_write_page+0x41
suspend_compress_write_page+0x137
worker_rw_loop
worker_rw_loop+0x133
worker_rw_loop
kthread+0xf5
schedule_tail_0x45
child_rip+0x45
worker_thread
kthread
child_rip 
--------------------

It seems that the problem is when suspend2 tries to write to the SSD drive.
I am not sure whether the problem is with the suspend2 module or the mpt driver? 
I am using kernel 2.6.21.1 x86_64 with fedora core 5 x86_64. MPT driver 3.04
Any insights/recommendations will be greatly appreciated.  

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