On Fri, 2009-12-04 at 23:58 +1100, Finn Thain wrote:
> On Wed, 2 Dec 2009, David Miller wrote:
>
> ...
> >
> > Can you explain why the esp_slave_configure() part of your patch is
> > necessary?
> >
> > > Index: linux-2.6.31/drivers/scsi/esp_scsi.c
> > > ===================================================================
> > > --- linux-2.6.31.orig/drivers/scsi/esp_scsi.c 2009-11-23
> > > 12:52:45.000000000 +1100
> > > +++ linux-2.6.31/drivers/scsi/esp_scsi.c 2009-11-23 12:53:30.000000000
> > > +1100
> > > @@ -2405,12 +2405,6 @@ static int esp_slave_configure(struct sc
> > > struct esp_target_data *tp = &esp->target[dev->id];
> > > int goal_tags, queue_depth;
> > >
> > > - if (esp->flags & ESP_FLAG_DISABLE_SYNC) {
> > > - /* Bypass async domain validation */
> > > - dev->ppr = 0;
> > > - dev->sdtr = 0;
> > > - }
> > > -
> > > goal_tags = 0;
> > >
> > > if (dev->tagged_supported) {
> > > @@ -2433,6 +2427,11 @@ static int esp_slave_configure(struct sc
> > > }
> > > tp->flags |= ESP_TGT_DISCONNECT;
> > >
> > > + if (esp->flags & ESP_FLAG_DISABLE_SYNC) {
> > > + dev->wdtr = spi_support_wide(dev->sdev_target) = 0;
> > > + dev->sdtr = spi_support_sync(dev->sdev_target) = 0;
> > > + }
> > > +
> > > if (!spi_initial_dv(dev->sdev_target))
> > > spi_dv_device(dev);
> > >
>
> The aim is that domain validation will not test for sync when we know it
> can't work (in PIO mode). This is the result:
So this isn't the correct way to handle the problem. You're altering
the disk capability flags to trick the transport class. What you want
to be doing is updating esp_set_period so it won't go under whatever you
deem to be a correct period setting (or if it's really async then it
won't set the period at all).
James
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