[PATCH] libata: consider disabled devices in ata_dev_xfermask()

ata_bus_probe() now marks failed devices properly and leaves
meaningful transfer mode masks.  This patch makes ata_dev_xfermask()
consider disable devices when determining PIO mode to avoid violating
device selection timing.

While at it, move port-wide resttriction out of device iteration loop
and try to make the function look a bit prettier.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

1 files changed, 23 insertions, 11 deletions

diff --git a/drivers/scsi/libata-core.c b/drivers/scsi/libata-core.c
index 33b5bff58cc3..00018705582b 100644
--- a/drivers/scsi/libata-core.c
+++ b/drivers/scsi/libata-core.c
@@ -2913,23 +2913,34 @@ static void ata_dev_xfermask(struct ata_port *ap, struct ata_device *dev)
         unsigned long xfer_mask;
         int i;
 
-        xfer_mask = ata_pack_xfermask(ap->pio_mask, ap->mwdma_mask,
-                                      ap->udma_mask);
+        xfer_mask = ata_pack_xfermask(ap->pio_mask,
+                                      ap->mwdma_mask, ap->udma_mask);
+
+        /* Apply cable rule here.  Don't apply it early because when
+         * we handle hot plug the cable type can itself change.
+         */
+        if (ap->cbl == ATA_CBL_PATA40)
+                xfer_mask &= ~(0xF8 << ATA_SHIFT_UDMA);
 
         /* FIXME: Use port-wide xfermask for now */
         for (i = 0; i < ATA_MAX_DEVICES; i++) {
                 struct ata_device *d = &ap->device[i];
-                if (!ata_dev_enabled(d))
+
+                if (ata_dev_absent(d))
+                        continue;
+
+                if (ata_dev_disabled(d)) {
+                        /* to avoid violating device selection timing */
+                        xfer_mask &= ata_pack_xfermask(d->pio_mask,
+                                                       UINT_MAX, UINT_MAX);
                         continue;
-                xfer_mask &= ata_pack_xfermask(d->pio_mask, d->mwdma_mask,
-                                               d->udma_mask);
+                }
+
+                xfer_mask &= ata_pack_xfermask(d->pio_mask,
+                                               d->mwdma_mask, d->udma_mask);
                 xfer_mask &= ata_id_xfermask(d->id);
                 if (ata_dma_blacklisted(d))
                         xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
-                /* Apply cable rule here. Don't apply it early because when
-                   we handle hot plug the cable type can itself change */
-                if (ap->cbl == ATA_CBL_PATA40)
-                        xfer_mask &= ~(0xF8 << ATA_SHIFT_UDMA);
         }
 
         if (ata_dma_blacklisted(dev))
@@ -2940,11 +2951,12 @@ static void ata_dev_xfermask(struct ata_port *ap, struct ata_device *dev)
                 if (hs->simplex_claimed)
                         xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
         }
+
         if (ap->ops->mode_filter)
                 xfer_mask = ap->ops->mode_filter(ap, dev, xfer_mask);
 
-        ata_unpack_xfermask(xfer_mask, &dev->pio_mask, &dev->mwdma_mask,
-                            &dev->udma_mask);
+        ata_unpack_xfermask(xfer_mask, &dev->pio_mask,
+                            &dev->mwdma_mask, &dev->udma_mask);
 }
 
 /**