linux-kernel - Re: [PATCH 01/12] libiscsi: Convert to host_lock less w/ interrupts disabled internally

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Date:	Sun, 26 Dec 2010 21:44:58 -0600
From:	Mike Christie <michaelc@...wisc.edu>
To:	open-iscsi@...glegroups.com
CC:	"Nicholas A. Bellinger" <nab@...ux-iscsi.org>,
	Matthew Wilcox <matthew@....cx>,
	linux-scsi <linux-scsi@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	James Bottomley <James.Bottomley@...e.de>,
	Jeff Garzik <jeff@...zik.org>, Christoph Hellwig <hch@....de>,
	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
	Hannes Reinecke <hare@...e.de>
Subject: Re: [PATCH 01/12] libiscsi: Convert to host_lock less	w/	interrupts
 disabled internally

On 12/23/2010 03:23 PM, Nicholas A. Bellinger wrote:
> On Mon, 2010-12-20 at 18:36 -0600, Mike Christie wrote:
>> On 12/20/2010 03:30 AM, Nicholas A. Bellinger wrote:
>>> After a quick audit of iscsi_session->lock usage, and I see that
>>> iscsi_complete_pdu(), iscsi_tmf_timedout(), iscsi_eh_cmd_timed_out(),
>>> iscsi_check_transport_timeouts() are using spin_lock(), and
>>> iscsi_session_failure() and iscsi_conn_failure() are using
>>> spin_lock_irqsave().
>>>
>>> Mike and Hannes, would you guys mind commenting on this..?  From what I
>>> can determine these should all be converted to use spin_lock_bh(),
>>> yes..?
>>>
>>
>> Yeah, they can use _bh locking. I was going to use them for qla4xxx eh,
>> which does iscsi processing in its irq, but we never did.
>
> Thanks for the clarification.  I would be happy to submit a patch next
> week for this seperately from the host_lock-less conversion pieces, or
> would you prefer handle this yourself..?
>

I am testing something now. Do not worry about it. Thanks for the work 
on this.
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