linux-kernel - RE: [PATCH 10/22] staging: unisys: visorbus: Make use of the new sg

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Message-ID: <CY4PR07MB317691139A5B2F902CDA9B0EF0050@CY4PR07MB3176.namprd07.prod.outlook.com>
Date:   Fri, 14 Apr 2017 16:07:14 +0000
From:   "Kershner, David A" <David.Kershner@...sys.com>
To:     Logan Gunthorpe <logang@...tatee.com>,
        Christoph Hellwig <hch@....de>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Sagi Grimberg <sagi@...mberg.me>, Jens Axboe <axboe@...nel.dk>,
        Tejun Heo <tj@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Ross Zwisler <ross.zwisler@...ux.intel.com>,
        Matthew Wilcox <mawilcox@...rosoft.com>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        Ming Lin <ming.l@....samsung.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-crypto@...r.kernel.org" <linux-crypto@...r.kernel.org>,
        "linux-media@...r.kernel.org" <linux-media@...r.kernel.org>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "linaro-mm-sig@...ts.linaro.org" <linaro-mm-sig@...ts.linaro.org>,
        "intel-gfx@...ts.freedesktop.org" <intel-gfx@...ts.freedesktop.org>,
        "linux-raid@...r.kernel.org" <linux-raid@...r.kernel.org>,
        "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        "linux-nvme@...ts.infradead.org" <linux-nvme@...ts.infradead.org>,
        "linux-nvdimm@...ts.01.org" <linux-nvdimm@...ts.01.org>,
        "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
        "fcoe-devel@...n-fcoe.org" <fcoe-devel@...n-fcoe.org>,
        "open-iscsi@...glegroups.com" <open-iscsi@...glegroups.com>,
        "megaraidlinux.pdl@...adcom.com" <megaraidlinux.pdl@...adcom.com>,
        *S-Par-Maintainer <SParMaintainer@...sys.com>,
        "devel@...verdev.osuosl.org" <devel@...verdev.osuosl.org>,
        "target-devel@...r.kernel.org" <target-devel@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
        "rds-devel@....oracle.com" <rds-devel@....oracle.com>
CC:     Steve Wise <swise@...ngridcomputing.com>,
        Stephen Bates <sbates@...thlin.com>
Subject: RE: [PATCH 10/22] staging: unisys: visorbus: Make use of the new
 sg_map helper function

> -----Original Message-----
> From: Logan Gunthorpe [mailto:logang@...tatee.com]
...
> Subject: [PATCH 10/22] staging: unisys: visorbus: Make use of the new
> sg_map helper function
> 
> Straightforward conversion to the new function.
> 
> Signed-off-by: Logan Gunthorpe <logang@...tatee.com>

Can you add Acked-by for this patch? 

Acked-by: David Kershner <david.kershner@...sys.com>

Tested on s-Par and no problems. 

Thanks,
David Kershner

> ---
>  drivers/staging/unisys/visorhba/visorhba_main.c | 12 +++++++-----
>  1 file changed, 7 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/staging/unisys/visorhba/visorhba_main.c
> b/drivers/staging/unisys/visorhba/visorhba_main.c
> index 0ce92c8..2d8c8bc 100644
> --- a/drivers/staging/unisys/visorhba/visorhba_main.c
> +++ b/drivers/staging/unisys/visorhba/visorhba_main.c
> @@ -842,7 +842,6 @@ do_scsi_nolinuxstat(struct uiscmdrsp *cmdrsp, struct
> scsi_cmnd *scsicmd)
>  	struct scatterlist *sg;
>  	unsigned int i;
>  	char *this_page;
> -	char *this_page_orig;
>  	int bufind = 0;
>  	struct visordisk_info *vdisk;
>  	struct visorhba_devdata *devdata;
> @@ -869,11 +868,14 @@ do_scsi_nolinuxstat(struct uiscmdrsp *cmdrsp,
> struct scsi_cmnd *scsicmd)
> 
>  		sg = scsi_sglist(scsicmd);
>  		for (i = 0; i < scsi_sg_count(scsicmd); i++) {
> -			this_page_orig = kmap_atomic(sg_page(sg + i));
> -			this_page = (void *)((unsigned long)this_page_orig |
> -					     sg[i].offset);
> +			this_page = sg_map(sg + i, SG_KMAP_ATOMIC);
> +			if (IS_ERR(this_page)) {
> +				scsicmd->result = DID_ERROR << 16;
> +				return;
> +			}
> +
>  			memcpy(this_page, buf + bufind, sg[i].length);
> -			kunmap_atomic(this_page_orig);
> +			sg_unmap(sg + i, this_page, SG_KMAP_ATOMIC);
>  		}
>  	} else {
>  		devdata = (struct visorhba_devdata *)scsidev->host-
> >hostdata;
> --
> 2.1.4