linux-kernel - Re: [PATCH -mm 09/11] call blk_queue_segment_boundary in __scsi_alloc

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Date:	Wed, 24 Oct 2007 07:39:16 -0400
From:	Jeff Garzik <jeff@...zik.org>
To:	FUJITA Tomonori <tomof@....org>
CC:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	linux-scsi@...r.kernel.org, James.Bottomley@...elEye.com,
	fujita.tomonori@....ntt.co.jp, Jens Axboe <jens.axboe@...cle.com>
Subject: Re: [PATCH -mm 09/11] call blk_queue_segment_boundary in __scsi_alloc_queue

FUJITA Tomonori wrote:
> request_queue and device struct must have the same value of a segment
> size limit. This patch adds blk_queue_segment_boundary in
> __scsi_alloc_queue so LLDs don't need to call both
> blk_queue_segment_boundary and set_dma_max_seg_size. A LLD can change
> the default value (64KB) can call device_dma_parameters accessors like
> pci_set_dma_max_seg_size when allocating scsi_host.
> 
> Signed-off-by: FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
> ---
>  drivers/scsi/scsi_lib.c |    3 +++
>  1 files changed, 3 insertions(+), 0 deletions(-)
> 
> diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
> index 61fdaf0..23a30ab 100644
> --- a/drivers/scsi/scsi_lib.c
> +++ b/drivers/scsi/scsi_lib.c
> @@ -1645,6 +1645,7 @@ struct request_queue *__scsi_alloc_queue(struct Scsi_Host *shost,
>  					 request_fn_proc *request_fn)
>  {
>  	struct request_queue *q;
> +	struct device *dev = shost->shost_gendev.parent;
>  
>  	q = blk_init_queue(request_fn, NULL);
>  	if (!q)
> @@ -1673,6 +1674,8 @@ struct request_queue *__scsi_alloc_queue(struct Scsi_Host *shost,
>  	blk_queue_bounce_limit(q, scsi_calculate_bounce_limit(shost));
>  	blk_queue_segment_boundary(q, shost->dma_boundary);
>  
> +	blk_queue_max_segment_size(q, dma_get_max_seg_size(dev));
> +

it would be nice to have something more general that's useable in 
drivers/block/sx8.c (for example), something like

	static inline void
	dev_blk_associate(struct device *dev, request_queue *q)
	{
		blk_queue_max_segment_size(q,
					dma_get_max_seg_size(dev));
	}

still, I will ACK the above patch (#9) in case you wish that to become a 
future cleanup, or others dislike this suggestion

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