* If _GTF evalution fails, it's pointless to retry. If nothing else
is wrong, just ignore the error.
* After disabling ACPI, return success iff the number of executed _GTF
command equals zero. Otherwise, tell EH to retry. This change
fixes bogus 1 return bug where ata_acpi_on_devcfg() expects the
caller to reload IDENTIFY data and continue but the caller
interprets it as an error.
Signed-off-by: Tejun Heo <htejun@xxxxxxxxx>
---
drivers/ata/libata-acpi.c | 59 +++++++++++++++++++++++++++++----------------
1 files changed, 38 insertions(+), 21 deletions(-)
diff --git a/drivers/ata/libata-acpi.c b/drivers/ata/libata-acpi.c
index e0dd132..5932ae2 100644
--- a/drivers/ata/libata-acpi.c
+++ b/drivers/ata/libata-acpi.c
@@ -346,8 +346,8 @@ EXPORT_SYMBOL_GPL(ata_acpi_stm);
* EH context.
*
* RETURNS:
- * Number of taskfiles on success, 0 if _GTF doesn't exist or doesn't
- * contain valid data.
+ * Number of taskfiles on success, 0 if _GTF doesn't exist. -EINVAL
+ * if _GTF is invalid.
*/
static int ata_dev_get_GTF(struct ata_device *dev, struct ata_acpi_gtf **gtf)
{
@@ -380,6 +380,7 @@ 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 = -EINVAL;
}
goto out_free;
}
@@ -391,6 +392,7 @@ static int ata_dev_get_GTF(struct ata_device *dev, struct ata_acpi_gtf **gtf)
__FUNCTION__,
(unsigned long long)output.length,
output.pointer);
+ rc = -EINVAL;
goto out_free;
}
@@ -398,6 +400,7 @@ 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;
}
@@ -405,6 +408,7 @@ 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;
}
@@ -531,6 +535,7 @@ static int taskfile_load_raw(struct ata_device *dev,
/**
* ata_acpi_exec_tfs - get then write drive taskfile settings
* @dev: target ATA device
+ * @nr_executed: out paramter for the number of executed commands
*
* Evaluate _GTF and excute returned taskfiles.
*
@@ -538,16 +543,19 @@ static int taskfile_load_raw(struct ata_device *dev,
* EH context.
*
* RETURNS:
- * Number of executed taskfiles on success, 0 if _GTF doesn't exist or
- * doesn't contain valid data. -errno on other errors.
+ * Number of executed taskfiles on success, 0 if _GTF doesn't exist.
+ * -errno on other errors.
*/
-static int ata_acpi_exec_tfs(struct ata_device *dev)
+static int ata_acpi_exec_tfs(struct ata_device *dev, int *nr_executed)
{
struct ata_acpi_gtf *gtf = NULL;
int gtf_count, i, rc;
/* get taskfiles */
- gtf_count = ata_dev_get_GTF(dev, >f);
+ rc = ata_dev_get_GTF(dev, >f);
+ if (rc < 0)
+ return rc;
+ gtf_count = rc;
/* execute them */
for (i = 0, rc = 0; i < gtf_count; i++) {
@@ -559,12 +567,12 @@ static int ata_acpi_exec_tfs(struct ata_device *dev)
tmp = taskfile_load_raw(dev, gtf++);
if (!rc)
rc = tmp;
+
+ (*nr_executed)++;
}
ata_acpi_clear_gtf(dev);
- if (rc == 0)
- return gtf_count;
return rc;
}
@@ -700,6 +708,7 @@ int ata_acpi_on_devcfg(struct ata_device *dev)
struct ata_port *ap = dev->link->ap;
struct ata_eh_context *ehc = &ap->link.eh_context;
int acpi_sata = ap->flags & ATA_FLAG_ACPI_SATA;
+ int nr_executed = 0;
int rc;
if (!dev->acpi_handle)
@@ -718,14 +727,14 @@ int ata_acpi_on_devcfg(struct ata_device *dev)
}
/* do _GTF */
- rc = ata_acpi_exec_tfs(dev);
- if (rc < 0)
+ rc = ata_acpi_exec_tfs(dev, &nr_executed);
+ if (rc)
goto acpi_err;
dev->flags &= ~ATA_DFLAG_ACPI_PENDING;
/* refresh IDENTIFY page if any _GTF command has been executed */
- if (rc > 0) {
+ if (nr_executed) {
rc = ata_dev_reread_id(dev, 0);
if (rc < 0) {
ata_dev_printk(dev, KERN_ERR, "failed to IDENTIFY "
@@ -737,18 +746,26 @@ int ata_acpi_on_devcfg(struct ata_device *dev)
return 0;
acpi_err:
- /* let EH retry on the first failure, disable ACPI on the second */
- if (dev->flags & ATA_DFLAG_ACPI_FAILED) {
- ata_dev_printk(dev, KERN_WARNING, "ACPI on devcfg failed the "
- "second time, disabling (errno=%d)\n", rc);
-
- dev->acpi_handle = NULL;
+ /* ignore evaluation failure if we can continue safely */
+ if (rc == -EINVAL && !nr_executed && !(ap->pflags & ATA_PFLAG_FROZEN))
+ return 0;
- /* if port is working, request IDENTIFY reload and continue */
- if (!(ap->pflags & ATA_PFLAG_FROZEN))
- rc = 1;
+ /* fail and let EH retry once more for unknown IO errors */
+ if (!(dev->flags & ATA_DFLAG_ACPI_FAILED)) {
+ dev->flags |= ATA_DFLAG_ACPI_FAILED;
+ return rc;
}
- dev->flags |= ATA_DFLAG_ACPI_FAILED;
+
+ ata_dev_printk(dev, KERN_WARNING,
+ "ACPI: failed the second time, disabled\n");
+ dev->acpi_handle = NULL;
+
+ /* We can safely continue if no _GTF command has been executed
+ * and port is not frozen.
+ */
+ if (!nr_executed && !(ap->pflags & ATA_PFLAG_FROZEN))
+ return 0;
+
return rc;
}
--
1.5.2.4
-
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