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Date: Tue, 25 Jun 2019 10:30:28 +0800
From: Ming Lei <ming.lei@redhat.com>
Subject: Re: [PATCH V5 10/16] s390: zfcp_fc: use sg helper to operate
 scatterlist
Message-ID: <20190625023027.GF23777@ming.t460p>
References: <20190618013757.22401-1-ming.lei@redhat.com>
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To: Finn Thain <fthain@telegraphics.com.au>
Cc: Steffen Maier <maier@linux.ibm.com>, linux-scsi@vger.kernel.org, "Martin K . Petersen" <martin.petersen@oracle.com>, James Bottomley <James.Bottomley@hansenpartnership.com>, Bart Van Assche <bvanassche@acm.org>, Hannes Reinecke <hare@suse.com>, Christoph Hellwig <hch@lst.de>, Jim Gill <jgill@vmware.com>, Cathy Avery <cavery@redhat.com>, "Ewan D . Milne" <emilne@redhat.com>, Brian King <brking@us.ibm.com>, James Smart <james.smart@broadcom.com>, "Juergen E . Fischer" <fischer@norbit.de>, Michael Schmitz <schmitzmic@gmail.com>, Greg Kroah-Hartman <gregkh@linuxfoundation.org>, devel@driverdev.osuosl.org, linux-usb@vger.kernel.org, Dan Carpenter <dan.carpenter@oracle.com>, Benjamin Block <bblock@linux.ibm.com>, Martin Schwidefsky <schwidefsky@de.ibm.com>, Heiko Carstens <heiko.carstens@de.ibm.com>, linux-s390@vger.kernel.org

On Tue, Jun 25, 2019 at 12:01:24PM +1000, Finn Thain wrote:
> > diff --git a/drivers/s390/scsi/zfcp_dbf.c b/drivers/s390/scsi/zfcp_dbf.c
> > index dccdb41bed8c..c7129f5234f0 100644
> > --- a/drivers/s390/scsi/zfcp_dbf.c
> > +++ b/drivers/s390/scsi/zfcp_dbf.c
> > @@ -552,7 +552,7 @@ static u16 zfcp_dbf_san_res_cap_len_if_gpn_ft(char *tag,
> >  		if (x % (ZFCP_FC_GPN_FT_ENT_PAGE + 1))
> >  			acc++;
> >  		else
> > -			acc = sg_virt(++resp_entry);
> > +			acc = sg_virt(resp_entry = sg_next(resp_entry));
> 
> Shouldn't that be,
> 
> 			acc = sg_virt(sg_next(resp_entry));

resp_entry needs to be updated.

> 
> >  
> >  		last = acc->fp_flags & FC_NS_FID_LAST;
> >  	}
> > diff --git a/drivers/s390/scsi/zfcp_fc.c b/drivers/s390/scsi/zfcp_fc.c
> > index b018b61bd168..5048812ce660 100644
> > --- a/drivers/s390/scsi/zfcp_fc.c
> > +++ b/drivers/s390/scsi/zfcp_fc.c
> > @@ -742,7 +742,7 @@ static int zfcp_fc_eval_gpn_ft(struct zfcp_fc_req *fc_req,
> >  		if (x % (ZFCP_FC_GPN_FT_ENT_PAGE + 1))
> >  			acc++;
> >  		else
> > -			acc = sg_virt(++sg);
> > +			acc = sg_virt(sg = sg_next(sg));
> 
> and
> 
> 			acc = sg_virt(sg_next(sg));
> 
> ?

Same with above.

Thanks,
Ming