On Mon, 29 Oct 2007 15:07:06 -0400, Jeff Garzik wrote:
> Mikael Pettersson wrote:
> > @@ -155,7 +155,7 @@ static struct scsi_host_template pdc_ata
> > .queuecommand = ata_scsi_queuecmd,
> > .can_queue = ATA_DEF_QUEUE,
> > .this_id = ATA_SHT_THIS_ID,
> > - .sg_tablesize = LIBATA_MAX_PRD,
> > + .sg_tablesize = LIBATA_MAX_PRD-1,
> > .cmd_per_lun = ATA_SHT_CMD_PER_LUN,
> > .emulated = ATA_SHT_EMULATED,
> > .use_clustering = ATA_SHT_USE_CLUSTERING,
>
> IMO, this will be difficult for human eyes to see, many months from now.
>
> I would prefer a 'PDC_MAX_PRD' constant, defined to this value.
Agreed. I'll do this change.
> > @@ -530,7 +608,7 @@ static void pdc_qc_prep(struct ata_queue
> >
> > switch (qc->tf.protocol) {
> > case ATA_PROT_DMA:
> > - ata_qc_prep(qc);
> > + pdc_fill_sg(qc);
> > /* fall through */
> >
> > case ATA_PROT_NODATA:
> > @@ -546,11 +624,11 @@ static void pdc_qc_prep(struct ata_queue
> > break;
> >
> > case ATA_PROT_ATAPI:
> > - ata_qc_prep(qc);
> > + pdc_fill_sg(qc);
> > break;
> >
> > case ATA_PROT_ATAPI_DMA:
> > - ata_qc_prep(qc);
> > + pdc_fill_sg(qc);
> > /*FALLTHROUGH*/
>
> Note that this is not exactly an equivalent change -- you are removing
> the test in ata_qc_prep() that occurs prior to ata_fill_sg() call.
As Alexander replied, pdc_fill_sg() does include ata_qc_prep()'s
initial test. Unfortunately the name pdc_qc_prep() is already taken
[it switches on qc->tf.protocol], so that leaves either pdc_fill_sg()
[slightly imprecise as you noted], or uglies like __pdc_qc_prep(),
pdc_qc_prep2(), or pdc_qc_prep_and_fill_sg() as names for the new
procedure. I welcome suggestions for a better name.
/Mikael
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