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[SCSI] ipr: Provide reset_adapter retry method for offlined adapters

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If an ipr adapter repeatedly fails its initialization
the ipr driver will take the adapter offline and never talk
to it again. This provides a method for the user to manually
try the initialization again through sysfs.

Signed-off-by: Brian King <brking@us.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
This commit is contained in:
brking@us.ibm.com 2005-11-01 17:01:40 -06:00 committed by James Bottomley
parent d3c74871bd
commit f37eb54b48
1 changed files with 69 additions and 0 deletions
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69
drivers/scsi/ipr.c
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@ -2179,6 +2179,74 @@ static struct class_device_attribute ipr_diagnostics_attr = {
.store = ipr_store_diagnostics
};
/**
* ipr_show_adapter_state - Show the adapter's state
* @class_dev: class device struct
* @buf: buffer
*
* Return value:
* number of bytes printed to buffer
**/
static ssize_t ipr_show_adapter_state(struct class_device *class_dev, char *buf)
{
struct Scsi_Host *shost = class_to_shost(class_dev);
struct ipr_ioa_cfg *ioa_cfg = (struct ipr_ioa_cfg *)shost->hostdata;
unsigned long lock_flags = 0;
int len;
spin_lock_irqsave(ioa_cfg->host->host_lock, lock_flags);
if (ioa_cfg->ioa_is_dead)
len = snprintf(buf, PAGE_SIZE, "offline\n");
else
len = snprintf(buf, PAGE_SIZE, "online\n");
spin_unlock_irqrestore(ioa_cfg->host->host_lock, lock_flags);
return len;
}
/**
* ipr_store_adapter_state - Change adapter state
* @class_dev: class_device struct
* @buf: buffer
* @count: buffer size
*
* This function will change the adapter's state.
*
* Return value:
* count on success / other on failure
**/
static ssize_t ipr_store_adapter_state(struct class_device *class_dev,
const char *buf, size_t count)
{
struct Scsi_Host *shost = class_to_shost(class_dev);
struct ipr_ioa_cfg *ioa_cfg = (struct ipr_ioa_cfg *)shost->hostdata;
unsigned long lock_flags;
int result = count;
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
spin_lock_irqsave(ioa_cfg->host->host_lock, lock_flags);
if (ioa_cfg->ioa_is_dead && !strncmp(buf, "online", 6)) {
ioa_cfg->ioa_is_dead = 0;
ioa_cfg->reset_retries = 0;
ioa_cfg->in_ioa_bringdown = 0;
ipr_initiate_ioa_reset(ioa_cfg, IPR_SHUTDOWN_NONE);
}
spin_unlock_irqrestore(ioa_cfg->host->host_lock, lock_flags);
wait_event(ioa_cfg->reset_wait_q, !ioa_cfg->in_reset_reload);
return result;
}
static struct class_device_attribute ipr_ioa_state_attr = {
.attr = {
.name = "state",
.mode = S_IRUGO | S_IWUSR,
},
.show = ipr_show_adapter_state,
.store = ipr_store_adapter_state
};
/**
* ipr_store_reset_adapter - Reset the adapter
* @class_dev: class_device struct
@ -2515,6 +2583,7 @@ static struct class_device_attribute *ipr_ioa_attrs[] = {
&ipr_fw_version_attr,
&ipr_log_level_attr,
&ipr_diagnostics_attr,
&ipr_ioa_state_attr,
&ipr_ioa_reset_attr,
&ipr_update_fw_attr,
&ipr_ioa_cache_attr,