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authorTejun Heo <htejun@gmail.com>2006-08-20 17:56:38 +0900
committerJeff Garzik <jeff@garzik.org>2006-08-22 06:07:48 -0400
commitf1a58ecae527fc67c87ce4dcb9e73894f64aadfe (patch)
treee89e6440350a6990023b77fd5a0d7e9f5f9c4b28 /drivers
parentd14b50cc60ca465290fcdb3b88e7d5fb684361ed (diff)
[PATCH] ata_piix: fix ghost device probing by honoring PCS present bits
Move out PCS handling from piix_sata_prereset() into piix_sata_present_mask() and use it from newly implemented piix_sata_softreset(). Class codes for devices which are indicated to be absent by PCS are cleared to ATA_DEV_NONE. This fixes ghost device problem reported on ICH6 and 7. This patch moves PCS handling from prereset to softreset, which makes two behavior changes. * perform softreset even when PCS indicates no device * PCS handling is repeated before retrying softresets due to reset failures. Both behavior changes are intended and more consistent with how other drivers behave. Signed-off-by: Tejun Heo <htejun@gmail.com> Signed-off-by: Jeff Garzik <jeff@garzik.org>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/scsi/ata_piix.c60
1 files changed, 43 insertions, 17 deletions
diff --git a/drivers/scsi/ata_piix.c b/drivers/scsi/ata_piix.c
index 5e8afc876980..01b3530cf6df 100644
--- a/drivers/scsi/ata_piix.c
+++ b/drivers/scsi/ata_piix.c
@@ -531,27 +531,25 @@ static void piix_pata_error_handler(struct ata_port *ap)
}
/**
- * piix_sata_prereset - prereset for SATA host controller
+ * piix_sata_present_mask - determine present mask for SATA host controller
* @ap: Target port
*
- * Reads and configures SATA PCI device's PCI config register
- * Port Configuration and Status (PCS) to determine port and
- * device availability. Return -ENODEV to skip reset if no
- * device is present.
+ * Reads SATA PCI device's PCI config register Port Configuration
+ * and Status (PCS) to determine port and device availability.
*
* LOCKING:
* None (inherited from caller).
*
* RETURNS:
- * 0 if device is present, -ENODEV otherwise.
+ * determined present_mask
*/
-static int piix_sata_prereset(struct ata_port *ap)
+static unsigned int piix_sata_present_mask(struct ata_port *ap)
{
struct pci_dev *pdev = to_pci_dev(ap->host_set->dev);
struct piix_host_priv *hpriv = ap->host_set->private_data;
const unsigned int *map = hpriv->map;
int base = 2 * ap->hard_port_no;
- unsigned int present = 0;
+ unsigned int present_mask = 0;
int port, i;
u16 pcs;
@@ -564,24 +562,52 @@ static int piix_sata_prereset(struct ata_port *ap)
continue;
if ((ap->flags & PIIX_FLAG_IGNORE_PCS) ||
(pcs & 1 << (hpriv->map_db->present_shift + port)))
- present = 1;
+ present_mask |= 1 << i;
}
- DPRINTK("ata%u: LEAVE, pcs=0x%x present=0x%x\n",
- ap->id, pcs, present);
+ DPRINTK("ata%u: LEAVE, pcs=0x%x present_mask=0x%x\n",
+ ap->id, pcs, present_mask);
- if (!present) {
- ata_port_printk(ap, KERN_INFO, "SATA port has no device.\n");
- ap->eh_context.i.action &= ~ATA_EH_RESET_MASK;
- return 0;
+ return present_mask;
+}
+
+/**
+ * piix_sata_softreset - reset SATA host port via ATA SRST
+ * @ap: port to reset
+ * @classes: resulting classes of attached devices
+ *
+ * Reset SATA host port via ATA SRST. On controllers with
+ * reliable PCS present bits, the bits are used to determine
+ * device presence.
+ *
+ * LOCKING:
+ * Kernel thread context (may sleep)
+ *
+ * RETURNS:
+ * 0 on success, -errno otherwise.
+ */
+static int piix_sata_softreset(struct ata_port *ap, unsigned int *classes)
+{
+ unsigned int present_mask;
+ int i, rc;
+
+ present_mask = piix_sata_present_mask(ap);
+
+ rc = ata_std_softreset(ap, classes);
+ if (rc)
+ return rc;
+
+ for (i = 0; i < ATA_MAX_DEVICES; i++) {
+ if (!(present_mask & (1 << i)))
+ classes[i] = ATA_DEV_NONE;
}
- return ata_std_prereset(ap);
+ return 0;
}
static void piix_sata_error_handler(struct ata_port *ap)
{
- ata_bmdma_drive_eh(ap, piix_sata_prereset, ata_std_softreset, NULL,
+ ata_bmdma_drive_eh(ap, ata_std_prereset, piix_sata_softreset, NULL,
ata_std_postreset);
}