Other than adding the patch and rebuilding the kernel and testing regular
stuff, which I had to do anyway, that was the extent of testing.
I did not see where it was used to be honest other than adding the structure
member.
I wanted to test the simple change because it was in scsi_lib.c which has many
dependencies of course.
Laurence Oberman
Principal Software Maintenance Engineer
Red Hat Global Support Services
----- Original Message -----
From: "Bart Van Assche" <bart.vanass...@sandisk.com>
To: "Christoph Hellwig" <h...@lst.de>, linux-r...@vger.kernel.org,
linux-scsi@vger.kernel.org
Sent: Tuesday, April 12, 2016 11:19:20 AM
Subject: Re: [PATCH 1/2] scsi: add a max_segment_size limitation to struct
Scsi_Host
On 04/12/2016 07:13 AM, Christoph Hellwig wrote:
> diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
> index 8106515..ad79372 100644
> --- a/drivers/scsi/scsi_lib.c
> +++ b/drivers/scsi/scsi_lib.c
> @@ -2120,7 +2120,8 @@ static void __scsi_init_queue(struct Scsi_Host *shost,
> struct request_queue *q)
> blk_queue_segment_boundary(q, shost->dma_boundary);
> dma_set_seg_boundary(dev, shost->dma_boundary);
>
> - blk_queue_max_segment_size(q, dma_get_max_seg_size(dev));
> + blk_queue_max_segment_size(q, min_not_zero(shost->max_segment_size,
> + dma_get_max_seg_size(dev)));
>
> if (!shost->use_clustering)
> q->limits.cluster = 0;
> diff --git a/include/scsi/scsi_host.h b/include/scsi/scsi_host.h
> index fcfa3d7..f11d3fe 100644
> --- a/include/scsi/scsi_host.h
> +++ b/include/scsi/scsi_host.h
> @@ -621,6 +621,7 @@ struct Scsi_Host {
> short unsigned int sg_tablesize;
> short unsigned int sg_prot_tablesize;
> unsigned int max_sectors;
> + unsigned int max_segment_size;
> unsigned long dma_boundary;
> /*
> * In scsi-mq mode, the number of hardware queues supported by the LLD.
Hello Christoph,
The value zero has another meaning for Scsi_Host.max_segment_size than
for queue_limits.max_segment_size. Shouldn't that be documented somewhere?
Thanks,
Bart.
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