1 files changed, 37 insertions, 0 deletions

diff --git a/drivers/ata/ata_piix.c b/drivers/ata/ata_piix.c
index 54961c0b2c7..ef8b30d577b 100644
--- a/drivers/ata/ata_piix.c
+++ b/drivers/ata/ata_piix.c
@@ -1289,6 +1289,39 @@ static const int *__devinit piix_init_sata_map(struct pci_dev *pdev,
         return map;
 }
 
+static bool piix_no_sidpr(struct ata_host *host)
+{
+        struct pci_dev *pdev = to_pci_dev(host->dev);
+
+        /*
+         * Samsung DB-P70 only has three ATA ports exposed and
+         * curiously the unconnected first port reports link online
+         * while not responding to SRST protocol causing excessive
+         * detection delay.
+         *
+         * Unfortunately, the system doesn't carry enough DMI
+         * information to identify the machine but does have subsystem
+         * vendor and device set.  As it's unclear whether the
+         * subsystem vendor/device is used only for this specific
+         * board, the port can't be disabled solely with the
+         * information; however, turning off SIDPR access works around
+         * the problem.  Turn it off.
+         *
+         * This problem is reported in bnc#441240.
+         *
+         * https://bugzilla.novell.com/show_bug.cgi?id=441420
+         */
+        if (pdev->vendor == PCI_VENDOR_ID_INTEL && pdev->device == 0x2920 &&
+            pdev->subsystem_vendor == PCI_VENDOR_ID_SAMSUNG &&
+            pdev->subsystem_device == 0xb049) {
+                dev_printk(KERN_WARNING, host->dev,
+                           "Samsung DB-P70 detected, disabling SIDPR\n");
+                return true;
+        }
+
+        return false;
+}
+
 static int __devinit piix_init_sidpr(struct ata_host *host)
 {
         struct pci_dev *pdev = to_pci_dev(host->dev);
@@ -1302,6 +1335,10 @@ static int __devinit piix_init_sidpr(struct ata_host *host)
                 if (hpriv->map[i] == IDE)
                         return 0;
 
+        /* is it blacklisted? */
+        if (piix_no_sidpr(host))
+                return 0;
+
         if (!(host->ports[0]->flags & PIIX_FLAG_SIDPR))
                 return 0;