linux-kernel - Re: [PATCH 05/11] block: drop custom queue draining used by scsi_transport

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Date:	Tue, 01 May 2012 23:55:49 -0500
From:	Mike Christie <michaelc@...wisc.edu>
To:	Tejun Heo <tj@...nel.org>
CC:	axboe@...nel.dk, vgoyal@...hat.com, ctalbott@...gle.com,
	rni@...gle.com, linux-kernel@...r.kernel.org,
	cgroups@...r.kernel.org, containers@...ts.linux-foundation.org,
	fengguang.wu@...el.com, hughd@...gle.com,
	akpm@...ux-foundation.org,
	James Bottomley <James.Bottomley@...senPartnership.com>,
	James Smart <james.smart@...lex.com>
Subject: Re: [PATCH 05/11] block: drop custom queue draining used by scsi_transport_{iscsi|fc}

On 04/26/2012 04:59 PM, Tejun Heo wrote:
> iscsi_remove_host() uses bsg_remove_queue() which implements custom
> queue draining.  fc_bsg_remove() open-codes mostly identical logic.
> 
> The draining logic isn't correct in that blk_stop_queue() doesn't
> prevent new requests from being queued - it just stops processing, so
> nothing prevents new requests to be queued after the logic determines
> that the queue is drained.
> 
> blk_cleanup_queue() now implements proper queue draining and these
> custom draining logics aren't necessary.  Drop them and use
> bsg_unregister_queue() + blk_cleanup_queue() instead.
> 
> Signed-off-by: Tejun Heo <tj@...nel.org>
> Cc: James Bottomley <James.Bottomley@...senPartnership.com>
> Cc: Mike Christie <michaelc@...wisc.edu>
> Cc: James Smart <james.smart@...lex.com>
> ---
>  block/bsg-lib.c                     |   53 -----------------------------------
>  drivers/scsi/scsi_transport_fc.c    |   38 -------------------------
>  drivers/scsi/scsi_transport_iscsi.c |    2 +-

iSCSI changes worked ok for me. I replicated the problem that the old
code was supposed to fix and verified the new code worked ok. I also
tested the FC code briefly (I do not have a proper setup to really
stress it), and it worked ok.

Thanks for killing that code for us.

Reviewed-by: Mike Christie <michaelc@....wisc.edu>
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