linux-kernel - Re: kexec and aacraid broken

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Message-ID: <20070530132430.GA3773@in.ibm.com>
Date:	Wed, 30 May 2007 18:54:30 +0530
From:	Vivek Goyal <vgoyal@...ibm.com>
To:	"Salyzyn, Mark" <mark_salyzyn@...ptec.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Yinghai Lu <yhlu.kernel@...il.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-scsi@...r.kernel.org,
	Michal Piotrowski <michal.k.k.piotrowski@...il.com>
Subject: Re: kexec and aacraid broken

On Wed, May 30, 2007 at 07:44:02AM -0400, Salyzyn, Mark wrote:
> I believe this issue is a result of the aacraid_commit_reset patch (as
> posted for scsi-misc-2.6, enclosed to permit testing) not yet propagated
> to the 2.6.22-rc3 tree.
> 
> This is the adapter taking longer than 3 minutes to start after a reset.
> I seriously doubt either of these patches suggested below will have an
> affect. And if they do, they are not root cause, one reduces the chances
> that the card will be reset during initialization (thus applied would
> likely mitigate this problem), the other prevents a panic when the
> Adapter is reset (removed, would result in dogs and cats sleeping with
> each other).
> 
> Please use kernel parameter aacraid.startup_timeout=540 (merely larger
> than the default 180 seconds) when spawning the kexec or see if the
> aacraid_commit_reset.patch resolves the issue to confirm my hunch.
> 

Hi Mark,

During a normal kexec (not kdump) adapter reset should not have taken
place at all. device_shutdown() routines should have taken care to
bring the device to a known sane state in first kernel so that second
kernel can initialize it without doing a reset.

With reset patch, now reset triggers on every kexec. Previously
that was not the case with kexec and adapter used to come up. I think
this needs to be looked into.

Thanks
Vivek
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