ata-acpi: don't call _GTF for disabled drive

I got below log after a S3 resume in a ASUS A6VC laptop. The system has
only one IDE drive. It appears there is no reason calling _GTF for
disabled drive.

ACPI Error (dsopcode-0483): Attempt to CreateField of length zero [20070126]
ACPI Error (psparse-0537): Method parse/execution failed [\_SB_.PCI0.IDE0.RATA] (Node df822a7c), AE_AML_OPERAND_VALUE
ACPI Error (psparse-0537): Method parse/execution failed [\_SB_.PCI0.IDE0.CHN1.DRV0._GTF] (Node df822bd0), AE_AML_OPERAND_VALUE
ata2.00: _GTF evaluation failed (AE 0x3006)
ACPI Error (dsopcode-0483): Attempt to CreateField of length zero [20070126]
ACPI Error (psparse-0537): Method parse/execution failed [\_SB_.PCI0.IDE0.RATA] (Node df822a7c), AE_AML_OPERAND_VALUE
ACPI Error (psparse-0537): Method parse/execution failed [\_SB_.PCI0.IDE0.CHN1.DRV1._GTF] (Node df822b94), AE_AML_OPERAND_VALUE
ata2.01: _GTF evaluation failed (AE 0x3006)

Signed-off-by: Shaohua Li <shaohua.li@intel.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>

1 files changed, 4 insertions, 2 deletions

diff --git a/drivers/ata/libata-acpi.c b/drivers/ata/libata-acpi.c
index f88a4f940e11..8c1cfc645c85 100644
--- a/drivers/ata/libata-acpi.c
+++ b/drivers/ata/libata-acpi.c
@@ -839,7 +839,8 @@ void ata_acpi_on_resume(struct ata_port *ap)
                  */
                 ata_link_for_each_dev(dev, &ap->link) {
                         ata_acpi_clear_gtf(dev);
-                        if (ata_dev_get_GTF(dev, NULL) >= 0)
+                        if (ata_dev_enabled(dev) &&
+                            ata_dev_get_GTF(dev, NULL) >= 0)
                                 dev->flags |= ATA_DFLAG_ACPI_PENDING;
                 }
         } else {
@@ -849,7 +850,8 @@ void ata_acpi_on_resume(struct ata_port *ap)
                  */
                 ata_link_for_each_dev(dev, &ap->link) {
                         ata_acpi_clear_gtf(dev);
-                        dev->flags |= ATA_DFLAG_ACPI_PENDING;
+                        if (ata_dev_enabled(dev))
+                                dev->flags |= ATA_DFLAG_ACPI_PENDING;
                 }
         }
 }