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Commit f37eb54b authored by Brian King's avatar Brian King Committed by James Bottomley
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[SCSI] ipr: Provide reset_adapter retry method for offlined adapters 



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: default avatarBrian King <brking@us.ibm.com>
Signed-off-by: default avatarJames Bottomley <James.Bottomley@SteelEye.com>
parent d3c74871

drivers/scsi/ipr.c

+69 −0
Original line number Diff line number Diff line
@@ -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,