libata: Don't fail device revalidation for bad _GTF methods

Experience suggests that the _GTF method may be bad. We currently fail
device revalidation in that case, which seems excessive.

Signed-off-by: Matthew Garrett <mjg59@srcf.ucam.org>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

diff --git a/drivers/ata/libata-acpi.c b/drivers/ata/libata-acpi.c
index 08a52dd45fb6a4bd686ee0ef05f1cc069f863713..545ea865ceb522bf37b675558f9eedab1da7332d 100644 (file)
--- a/drivers/ata/libata-acpi.c
+++ b/drivers/ata/libata-acpi.c
@@ -312,7 +312,7 @@ EXPORT_SYMBOL_GPL(ata_acpi_stm);
  *
  * RETURNS:
  * Number of taskfiles on success, 0 if _GTF doesn't exist or doesn't
- * contain valid data.  -errno on other errors.
+ * contain valid data.
  */
 static int ata_dev_get_GTF(struct ata_device *dev, struct ata_acpi_gtf **gtf,
                           void **ptr_to_free)
@@ -339,7 +339,6 @@ static int ata_dev_get_GTF(struct ata_device *dev, struct ata_acpi_gtf **gtf,
                        ata_dev_printk(dev, KERN_WARNING,
                                       "_GTF evaluation failed (AE 0x%x)\n",
                                       status);
-                       rc = -EIO;
                }
                goto out_free;
        }
@@ -359,7 +358,6 @@ static int ata_dev_get_GTF(struct ata_device *dev, struct ata_acpi_gtf **gtf,
                ata_dev_printk(dev, KERN_WARNING,
                               "_GTF unexpected object type 0x%x\n",
                               out_obj->type);
-               rc = -EINVAL;
                goto out_free;
        }
 
@@ -367,7 +365,6 @@ static int ata_dev_get_GTF(struct ata_device *dev, struct ata_acpi_gtf **gtf,
                ata_dev_printk(dev, KERN_WARNING,
                               "unexpected _GTF length (%d)\n",
                               out_obj->buffer.length);
-               rc = -EINVAL;
                goto out_free;
        }
 
@@ -511,10 +508,7 @@ static int ata_acpi_exec_tfs(struct ata_device *dev)
        int gtf_count, i, rc;
 
        /* get taskfiles */
-       rc = ata_dev_get_GTF(dev, &gtf, &ptr_to_free);
-       if (rc < 0)
-               return rc;
-       gtf_count = rc;
+       gtf_count = ata_dev_get_GTF(dev, &gtf, &ptr_to_free);
 
        /* execute them */
        for (i = 0, rc = 0; i < gtf_count; i++) {