Re: [patch 1/2 -resend] SCSI: advansys: handle errors from scsi_dma_map()

[Dan Carpenter <dan.carpenter@oracle.com>]

On Wed, Jun 27, 2012 at 12:01:01PM +0200, walter harms wrote:
> 
> 
> Am 27.06.2012 11:00, schrieb Dan Carpenter:
> > scsi_dma_map() returns -ENOMEM on error.
> > 
> > Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
> > ---
> > Originally sent on Tue, 20 Sep 2011.
> > 
> > diff --git a/drivers/scsi/advansys.c b/drivers/scsi/advansys.c
> > index 374c4ed..b2c3a1a 100644
> > --- a/drivers/scsi/advansys.c
> > +++ b/drivers/scsi/advansys.c
> > @@ -8426,6 +8426,12 @@ static int asc_build_req(struct asc_board *boardp, struct scsi_cmnd *scp,
> >  
> >  	/* Build ASC_SCSI_Q */
> >  	use_sg = scsi_dma_map(scp);
> > +	if (use_sg < 0) {
> > +		scsi_dma_unmap(scp);
> > +		scp->result = HOST_BYTE(DID_SOFT_ERROR);
> > +		return ASC_ERROR;
> > +	}
> > +
> >  	if (use_sg != 0) {
> >  		int sgcnt;
> >  		struct scatterlist *slp;
> 
> Q:if use_sg == 0 a special case ?
> 

Yes.  scsi_dma_map() returns the number of sg lists actually used,
zero if the sg lists is NULL, or -ENOMEM if the mapping failed.

regards,
dan carpenter