libata-acpi: Fix NULL ptr derference in ata_acpi_dev_handle

commit 6b66d95895c149cbc04d4fac5a2f5477c543a8ae didn't handle SATA PMP
case in ata_acpi_bind_device and will cause a NULL ptr dereference when
user attached a SATA drive to the PMP port. Fix this by checking PMP
support.

This bug is reported by Dan van der Ster in the following bugzilla page:
https://bugzilla.kernel.org/show_bug.cgi?id=48211

Reported-by: Dan van der Ster <dan@vanderster.com>
Tested-by: Dan van der Ster <dan@vanderster.com>
Signed-off-by: Aaron Lu <aaron.lu@intel.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
Tested-by: Simon <tangouniform@sbcglobal.net>

diff --git a/drivers/ata/libata-acpi.c b/drivers/ata/libata-acpi.c
index fd9ecf7..5b0ba3f 100644 (file)
--- a/drivers/ata/libata-acpi.c
+++ b/drivers/ata/libata-acpi.c
@@ -1105,10 +1105,15 @@ static int ata_acpi_bind_device(struct ata_port *ap, struct scsi_device *sdev,
        struct acpi_device *acpi_dev;
        struct acpi_device_power_state *states;
 
-       if (ap->flags & ATA_FLAG_ACPI_SATA)
-               ata_dev = &ap->link.device[sdev->channel];
-       else
+       if (ap->flags & ATA_FLAG_ACPI_SATA) {
+               if (!sata_pmp_attached(ap))
+                       ata_dev = &ap->link.device[sdev->id];
+               else
+                       ata_dev = &ap->pmp_link[sdev->channel].device[sdev->id];
+       }
+       else {
                ata_dev = &ap->link.device[sdev->id];
+       }
 
        *handle = ata_dev_acpi_handle(ata_dev);