1 files changed, 8 insertions, 0 deletions

diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c
index 9519c777af83..b8bea100a160 100644
--- a/drivers/ata/ahci.c
+++ b/drivers/ata/ahci.c
@@ -3004,6 +3004,14 @@ static int ahci_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
         if (pdev->vendor == PCI_VENDOR_ID_MARVELL && !marvell_enable)
                 return -ENODEV;
 
+        /* Promise's PDC42819 is a SAS/SATA controller that has an AHCI mode.
+         * At the moment, we can only use the AHCI mode. Let the users know
+         * that for SAS drives they're out of luck.
+         */
+        if (pdev->vendor == PCI_VENDOR_ID_PROMISE)
+                dev_printk(KERN_INFO, &pdev->dev, "PDC42819 "
+                           "can only drive SATA devices with this driver\n");
+
         /* acquire resources */
         rc = pcim_enable_device(pdev);
         if (rc)