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libata-acpi: improve ACPI disabling

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* 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@gmail.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Tejun Heo 2007-12-15 15:05:04 +09:00 committed by Jeff Garzik
parent 398e07826b
commit 66fa7f2158
1 changed files with 38 additions and 21 deletions
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57
drivers/ata/libata-acpi.c
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@ -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, &gtf);
rc = ata_dev_get_GTF(dev, &gtf);
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);
/* ignore evaluation failure if we can continue safely */
if (rc == -EINVAL && !nr_executed && !(ap->pflags & ATA_PFLAG_FROZEN))
return 0;
/* 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;
}
ata_dev_printk(dev, KERN_WARNING,
"ACPI: failed the second time, disabled\n");
dev->acpi_handle = NULL;
/* if port is working, request IDENTIFY reload and continue */
if (!(ap->pflags & ATA_PFLAG_FROZEN))
rc = 1;
}
dev->flags |= ATA_DFLAG_ACPI_FAILED;
/* 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;
}