linux-kernel - Re: [PATCH 0/8] Drop host_lock around LLD SHT->queuecommand() caller

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Message-ID: <1284686949.7280.99.camel@schen9-DESK>
Date:	Thu, 16 Sep 2010 18:29:09 -0700
From:	Tim Chen <tim.c.chen@...ux.intel.com>
To:	"Nicholas A. Bellinger" <nab@...ux-iscsi.org>
Cc:	linux-scsi <linux-scsi@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Vasu Dev <vasu.dev@...ux.intel.com>,
	Andi Kleen <ak@...ux.intel.com>,
	Matthew Wilcox <willy@...ux.intel.com>,
	James Bottomley <James.Bottomley@...e.de>,
	Mike Christie <michaelc@...wisc.edu>,
	James Smart <james.smart@...lex.com>,
	Andrew Vasquez <andrew.vasquez@...gic.com>,
	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
	Hannes Reinecke <hare@...e.de>,
	Joe Eykholt <jeykholt@...co.com>,
	Christoph Hellwig <hch@....de>
Subject: Re: [PATCH 0/8] Drop host_lock around LLD SHT->queuecommand()
 caller

On Thu, 2010-09-16 at 15:35 -0700, Nicholas A. Bellinger wrote:
> From: Nicholas Bellinger <nab@...ux-iscsi.org>
> 
> Greetings all,
> 
> This series contains the first round of a whole-sale conversion for droping
> struct Scsi_Host->host_lock around struct Scsi_Host->queuecommand() within
> scsi_dispatch_cmd().  So with this first patch the only part of scsi_dispatch_cmd()
> that is protected by host_lock is scsi_cmd_get_serial)_.
> 

Maybe we can change the host->cmd_serial_number to atomic and totally
avoid the need to take host_lock.

Tim

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