Orange Pi5 kernel

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Serial Attached SCSI (SAS) Transport Layer initialization
 *
 * Copyright (C) 2005 Adaptec, Inc.  All rights reserved.
 * Copyright (C) 2005 Luben Tuikov <luben_tuikov@adaptec.com>
 */
 
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/device.h>
#include <linux/spinlock.h>
#include <scsi/sas_ata.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_transport.h>
#include <scsi/scsi_transport_sas.h>
 
#include "sas_internal.h"
 
#include "../scsi_sas_internal.h"
 
static struct kmem_cache *sas_task_cache;
static struct kmem_cache *sas_event_cache;
 
struct sas_task *sas_alloc_task(gfp_t flags)
{
<------>struct sas_task *task = kmem_cache_zalloc(sas_task_cache, flags);
 
<------>if (task) {
<------><------>spin_lock_init(&task->task_state_lock);
<------><------>task->task_state_flags = SAS_TASK_STATE_PENDING;
<------>}
 
<------>return task;
}
EXPORT_SYMBOL_GPL(sas_alloc_task);
 
struct sas_task *sas_alloc_slow_task(gfp_t flags)
{
<------>struct sas_task *task = sas_alloc_task(flags);
<------>struct sas_task_slow *slow = kmalloc(sizeof(*slow), flags);
 
<------>if (!task || !slow) {
<------><------>if (task)
<------><------><------>kmem_cache_free(sas_task_cache, task);
<------><------>kfree(slow);
<------><------>return NULL;
<------>}
 
<------>task->slow_task = slow;
<------>slow->task = task;
<------>timer_setup(&slow->timer, NULL, 0);
<------>init_completion(&slow->completion);
 
<------>return task;
}
EXPORT_SYMBOL_GPL(sas_alloc_slow_task);
 
void sas_free_task(struct sas_task *task)
{
<------>if (task) {
<------><------>kfree(task->slow_task);
<------><------>kmem_cache_free(sas_task_cache, task);
<------>}
}
EXPORT_SYMBOL_GPL(sas_free_task);
 
/*------------ SAS addr hash -----------*/
void sas_hash_addr(u8 *hashed, const u8 *sas_addr)
{
<------>const u32 poly = 0x00DB2777;
<------>u32 r = 0;
<------>int i;
 
<------>for (i = 0; i < SAS_ADDR_SIZE; i++) {
<------><------>int b;
 
<------><------>for (b = (SAS_ADDR_SIZE - 1); b >= 0; b--) {
<------><------><------>r <<= 1;
<------><------><------>if ((1 << b) & sas_addr[i]) {
<------><------><------><------>if (!(r & 0x01000000))
<------><------><------><------><------>r ^= poly;
<------><------><------>} else if (r & 0x01000000) {
<------><------><------><------>r ^= poly;
<------><------><------>}
<------><------>}
<------>}
 
<------>hashed[0] = (r >> 16) & 0xFF;
<------>hashed[1] = (r >> 8) & 0xFF;
<------>hashed[2] = r & 0xFF;
}
 
int sas_register_ha(struct sas_ha_struct *sas_ha)
{
<------>char name[64];
<------>int error = 0;
 
<------>mutex_init(&sas_ha->disco_mutex);
<------>spin_lock_init(&sas_ha->phy_port_lock);
<------>sas_hash_addr(sas_ha->hashed_sas_addr, sas_ha->sas_addr);
 
<------>set_bit(SAS_HA_REGISTERED, &sas_ha->state);
<------>spin_lock_init(&sas_ha->lock);
<------>mutex_init(&sas_ha->drain_mutex);
<------>init_waitqueue_head(&sas_ha->eh_wait_q);
<------>INIT_LIST_HEAD(&sas_ha->defer_q);
<------>INIT_LIST_HEAD(&sas_ha->eh_dev_q);
 
<------>sas_ha->event_thres = SAS_PHY_SHUTDOWN_THRES;
 
<------>error = sas_register_phys(sas_ha);
<------>if (error) {
<------><------>pr_notice("couldn't register sas phys:%d\n", error);
<------><------>return error;
<------>}
 
<------>error = sas_register_ports(sas_ha);
<------>if (error) {
<------><------>pr_notice("couldn't register sas ports:%d\n", error);
<------><------>goto Undo_phys;
<------>}
 
<------>error = -ENOMEM;
<------>snprintf(name, sizeof(name), "%s_event_q", dev_name(sas_ha->dev));
<------>sas_ha->event_q = create_singlethread_workqueue(name);
<------>if (!sas_ha->event_q)
<------><------>goto Undo_ports;
 
<------>snprintf(name, sizeof(name), "%s_disco_q", dev_name(sas_ha->dev));
<------>sas_ha->disco_q = create_singlethread_workqueue(name);
<------>if (!sas_ha->disco_q)
<------><------>goto Undo_event_q;
 
<------>INIT_LIST_HEAD(&sas_ha->eh_done_q);
<------>INIT_LIST_HEAD(&sas_ha->eh_ata_q);
 
<------>return 0;
 
Undo_event_q:
<------>destroy_workqueue(sas_ha->event_q);
Undo_ports:
<------>sas_unregister_ports(sas_ha);
Undo_phys:
 
<------>return error;
}
 
static void sas_disable_events(struct sas_ha_struct *sas_ha)
{
<------>/* Set the state to unregistered to avoid further unchained
<------> * events to be queued, and flush any in-progress drainers
<------> */
<------>mutex_lock(&sas_ha->drain_mutex);
<------>spin_lock_irq(&sas_ha->lock);
<------>clear_bit(SAS_HA_REGISTERED, &sas_ha->state);
<------>spin_unlock_irq(&sas_ha->lock);
<------>__sas_drain_work(sas_ha);
<------>mutex_unlock(&sas_ha->drain_mutex);
}
 
int sas_unregister_ha(struct sas_ha_struct *sas_ha)
{
<------>sas_disable_events(sas_ha);
<------>sas_unregister_ports(sas_ha);
 
<------>/* flush unregistration work */
<------>mutex_lock(&sas_ha->drain_mutex);
<------>__sas_drain_work(sas_ha);
<------>mutex_unlock(&sas_ha->drain_mutex);
 
<------>destroy_workqueue(sas_ha->disco_q);
<------>destroy_workqueue(sas_ha->event_q);
 
<------>return 0;
}
 
static int sas_get_linkerrors(struct sas_phy *phy)
{
<------>if (scsi_is_sas_phy_local(phy)) {
<------><------>struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
<------><------>struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
<------><------>struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number];
<------><------>struct sas_internal *i =
<------><------><------>to_sas_internal(sas_ha->core.shost->transportt);
 
<------><------>return i->dft->lldd_control_phy(asd_phy, PHY_FUNC_GET_EVENTS, NULL);
<------>}
 
<------>return sas_smp_get_phy_events(phy);
}
 
int sas_try_ata_reset(struct asd_sas_phy *asd_phy)
{
<------>struct domain_device *dev = NULL;
 
<------>/* try to route user requested link resets through libata */
<------>if (asd_phy->port)
<------><------>dev = asd_phy->port->port_dev;
 
<------>/* validate that dev has been probed */
<------>if (dev)
<------><------>dev = sas_find_dev_by_rphy(dev->rphy);
 
<------>if (dev && dev_is_sata(dev)) {
<------><------>sas_ata_schedule_reset(dev);
<------><------>sas_ata_wait_eh(dev);
<------><------>return 0;
<------>}
 
<------>return -ENODEV;
}
 
/*
 * transport_sas_phy_reset - reset a phy and permit libata to manage the link
 *
 * phy reset request via sysfs in host workqueue context so we know we
 * can block on eh and safely traverse the domain_device topology
 */
static int transport_sas_phy_reset(struct sas_phy *phy, int hard_reset)
{
<------>enum phy_func reset_type;
 
<------>if (hard_reset)
<------><------>reset_type = PHY_FUNC_HARD_RESET;
<------>else
<------><------>reset_type = PHY_FUNC_LINK_RESET;
 
<------>if (scsi_is_sas_phy_local(phy)) {
<------><------>struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
<------><------>struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
<------><------>struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number];
<------><------>struct sas_internal *i =
<------><------><------>to_sas_internal(sas_ha->core.shost->transportt);
 
<------><------>if (!hard_reset && sas_try_ata_reset(asd_phy) == 0)
<------><------><------>return 0;
<------><------>return i->dft->lldd_control_phy(asd_phy, reset_type, NULL);
<------>} else {
<------><------>struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent);
<------><------>struct domain_device *ddev = sas_find_dev_by_rphy(rphy);
<------><------>struct domain_device *ata_dev = sas_ex_to_ata(ddev, phy->number);
 
<------><------>if (ata_dev && !hard_reset) {
<------><------><------>sas_ata_schedule_reset(ata_dev);
<------><------><------>sas_ata_wait_eh(ata_dev);
<------><------><------>return 0;
<------><------>} else
<------><------><------>return sas_smp_phy_control(ddev, phy->number, reset_type, NULL);
<------>}
}
 
static int sas_phy_enable(struct sas_phy *phy, int enable)
{
<------>int ret;
<------>enum phy_func cmd;
 
<------>if (enable)
<------><------>cmd = PHY_FUNC_LINK_RESET;
<------>else
<------><------>cmd = PHY_FUNC_DISABLE;
 
<------>if (scsi_is_sas_phy_local(phy)) {
<------><------>struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
<------><------>struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
<------><------>struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number];
<------><------>struct sas_internal *i =
<------><------><------>to_sas_internal(sas_ha->core.shost->transportt);
 
<------><------>if (enable)
<------><------><------>ret = transport_sas_phy_reset(phy, 0);
<------><------>else
<------><------><------>ret = i->dft->lldd_control_phy(asd_phy, cmd, NULL);
<------>} else {
<------><------>struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent);
<------><------>struct domain_device *ddev = sas_find_dev_by_rphy(rphy);
 
<------><------>if (enable)
<------><------><------>ret = transport_sas_phy_reset(phy, 0);
<------><------>else
<------><------><------>ret = sas_smp_phy_control(ddev, phy->number, cmd, NULL);
<------>}
<------>return ret;
}
 
int sas_phy_reset(struct sas_phy *phy, int hard_reset)
{
<------>int ret;
<------>enum phy_func reset_type;
 
<------>if (!phy->enabled)
<------><------>return -ENODEV;
 
<------>if (hard_reset)
<------><------>reset_type = PHY_FUNC_HARD_RESET;
<------>else
<------><------>reset_type = PHY_FUNC_LINK_RESET;
 
<------>if (scsi_is_sas_phy_local(phy)) {
<------><------>struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
<------><------>struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
<------><------>struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number];
<------><------>struct sas_internal *i =
<------><------><------>to_sas_internal(sas_ha->core.shost->transportt);
 
<------><------>ret = i->dft->lldd_control_phy(asd_phy, reset_type, NULL);
<------>} else {
<------><------>struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent);
<------><------>struct domain_device *ddev = sas_find_dev_by_rphy(rphy);
<------><------>ret = sas_smp_phy_control(ddev, phy->number, reset_type, NULL);
<------>}
<------>return ret;
}
 
int sas_set_phy_speed(struct sas_phy *phy,
<------><------>      struct sas_phy_linkrates *rates)
{
<------>int ret;
 
<------>if ((rates->minimum_linkrate &&
<------>     rates->minimum_linkrate > phy->maximum_linkrate) ||
<------>    (rates->maximum_linkrate &&
<------>     rates->maximum_linkrate < phy->minimum_linkrate))
<------><------>return -EINVAL;
 
<------>if (rates->minimum_linkrate &&
<------>    rates->minimum_linkrate < phy->minimum_linkrate_hw)
<------><------>rates->minimum_linkrate = phy->minimum_linkrate_hw;
 
<------>if (rates->maximum_linkrate &&
<------>    rates->maximum_linkrate > phy->maximum_linkrate_hw)
<------><------>rates->maximum_linkrate = phy->maximum_linkrate_hw;
 
<------>if (scsi_is_sas_phy_local(phy)) {
<------><------>struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
<------><------>struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
<------><------>struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number];
<------><------>struct sas_internal *i =
<------><------><------>to_sas_internal(sas_ha->core.shost->transportt);
 
<------><------>ret = i->dft->lldd_control_phy(asd_phy, PHY_FUNC_SET_LINK_RATE,
<------><------><------><------><------>       rates);
<------>} else {
<------><------>struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent);
<------><------>struct domain_device *ddev = sas_find_dev_by_rphy(rphy);
<------><------>ret = sas_smp_phy_control(ddev, phy->number,
<------><------><------><------><------>  PHY_FUNC_LINK_RESET, rates);
 
<------>}
 
<------>return ret;
}
 
void sas_prep_resume_ha(struct sas_ha_struct *ha)
{
<------>int i;
 
<------>set_bit(SAS_HA_REGISTERED, &ha->state);
 
<------>/* clear out any stale link events/data from the suspension path */
<------>for (i = 0; i < ha->num_phys; i++) {
<------><------>struct asd_sas_phy *phy = ha->sas_phy[i];
 
<------><------>memset(phy->attached_sas_addr, 0, SAS_ADDR_SIZE);
<------><------>phy->frame_rcvd_size = 0;
<------>}
}
EXPORT_SYMBOL(sas_prep_resume_ha);
 
static int phys_suspended(struct sas_ha_struct *ha)
{
<------>int i, rc = 0;
 
<------>for (i = 0; i < ha->num_phys; i++) {
<------><------>struct asd_sas_phy *phy = ha->sas_phy[i];
 
<------><------>if (phy->suspended)
<------><------><------>rc++;
<------>}
 
<------>return rc;
}
 
void sas_resume_ha(struct sas_ha_struct *ha)
{
<------>const unsigned long tmo = msecs_to_jiffies(25000);
<------>int i;
 
<------>/* deform ports on phys that did not resume
<------> * at this point we may be racing the phy coming back (as posted
<------> * by the lldd).  So we post the event and once we are in the
<------> * libsas context check that the phy remains suspended before
<------> * tearing it down.
<------> */
<------>i = phys_suspended(ha);
<------>if (i)
<------><------>dev_info(ha->dev, "waiting up to 25 seconds for %d phy%s to resume\n",
<------><------><------> i, i > 1 ? "s" : "");
<------>wait_event_timeout(ha->eh_wait_q, phys_suspended(ha) == 0, tmo);
<------>for (i = 0; i < ha->num_phys; i++) {
<------><------>struct asd_sas_phy *phy = ha->sas_phy[i];
 
<------><------>if (phy->suspended) {
<------><------><------>dev_warn(&phy->phy->dev, "resume timeout\n");
<------><------><------>sas_notify_phy_event(phy, PHYE_RESUME_TIMEOUT);
<------><------>}
<------>}
 
<------>/* all phys are back up or timed out, turn on i/o so we can
<------> * flush out disks that did not return
<------> */
<------>scsi_unblock_requests(ha->core.shost);
<------>sas_drain_work(ha);
}
EXPORT_SYMBOL(sas_resume_ha);
 
void sas_suspend_ha(struct sas_ha_struct *ha)
{
<------>int i;
 
<------>sas_disable_events(ha);
<------>scsi_block_requests(ha->core.shost);
<------>for (i = 0; i < ha->num_phys; i++) {
<------><------>struct asd_sas_port *port = ha->sas_port[i];
 
<------><------>sas_discover_event(port, DISCE_SUSPEND);
<------>}
 
<------>/* flush suspend events while unregistered */
<------>mutex_lock(&ha->drain_mutex);
<------>__sas_drain_work(ha);
<------>mutex_unlock(&ha->drain_mutex);
}
EXPORT_SYMBOL(sas_suspend_ha);
 
static void sas_phy_release(struct sas_phy *phy)
{
<------>kfree(phy->hostdata);
<------>phy->hostdata = NULL;
}
 
static void phy_reset_work(struct work_struct *work)
{
<------>struct sas_phy_data *d = container_of(work, typeof(*d), reset_work.work);
 
<------>d->reset_result = transport_sas_phy_reset(d->phy, d->hard_reset);
}
 
static void phy_enable_work(struct work_struct *work)
{
<------>struct sas_phy_data *d = container_of(work, typeof(*d), enable_work.work);
 
<------>d->enable_result = sas_phy_enable(d->phy, d->enable);
}
 
static int sas_phy_setup(struct sas_phy *phy)
{
<------>struct sas_phy_data *d = kzalloc(sizeof(*d), GFP_KERNEL);
 
<------>if (!d)
<------><------>return -ENOMEM;
 
<------>mutex_init(&d->event_lock);
<------>INIT_SAS_WORK(&d->reset_work, phy_reset_work);
<------>INIT_SAS_WORK(&d->enable_work, phy_enable_work);
<------>d->phy = phy;
<------>phy->hostdata = d;
 
<------>return 0;
}
 
static int queue_phy_reset(struct sas_phy *phy, int hard_reset)
{
<------>struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
<------>struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
<------>struct sas_phy_data *d = phy->hostdata;
<------>int rc;
 
<------>if (!d)
<------><------>return -ENOMEM;
 
<------>/* libsas workqueue coordinates ata-eh reset with discovery */
<------>mutex_lock(&d->event_lock);
<------>d->reset_result = 0;
<------>d->hard_reset = hard_reset;
 
<------>spin_lock_irq(&ha->lock);
<------>sas_queue_work(ha, &d->reset_work);
<------>spin_unlock_irq(&ha->lock);
 
<------>rc = sas_drain_work(ha);
<------>if (rc == 0)
<------><------>rc = d->reset_result;
<------>mutex_unlock(&d->event_lock);
 
<------>return rc;
}
 
static int queue_phy_enable(struct sas_phy *phy, int enable)
{
<------>struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
<------>struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
<------>struct sas_phy_data *d = phy->hostdata;
<------>int rc;
 
<------>if (!d)
<------><------>return -ENOMEM;
 
<------>/* libsas workqueue coordinates ata-eh reset with discovery */
<------>mutex_lock(&d->event_lock);
<------>d->enable_result = 0;
<------>d->enable = enable;
 
<------>spin_lock_irq(&ha->lock);
<------>sas_queue_work(ha, &d->enable_work);
<------>spin_unlock_irq(&ha->lock);
 
<------>rc = sas_drain_work(ha);
<------>if (rc == 0)
<------><------>rc = d->enable_result;
<------>mutex_unlock(&d->event_lock);
 
<------>return rc;
}
 
static struct sas_function_template sft = {
<------>.phy_enable = queue_phy_enable,
<------>.phy_reset = queue_phy_reset,
<------>.phy_setup = sas_phy_setup,
<------>.phy_release = sas_phy_release,
<------>.set_phy_speed = sas_set_phy_speed,
<------>.get_linkerrors = sas_get_linkerrors,
<------>.smp_handler = sas_smp_handler,
};
 
static inline ssize_t phy_event_threshold_show(struct device *dev,
<------><------><------>struct device_attribute *attr, char *buf)
{
<------>struct Scsi_Host *shost = class_to_shost(dev);
<------>struct sas_ha_struct *sha = SHOST_TO_SAS_HA(shost);
 
<------>return scnprintf(buf, PAGE_SIZE, "%u\n", sha->event_thres);
}
 
static inline ssize_t phy_event_threshold_store(struct device *dev,
<------><------><------>struct device_attribute *attr,
<------><------><------>const char *buf, size_t count)
{
<------>struct Scsi_Host *shost = class_to_shost(dev);
<------>struct sas_ha_struct *sha = SHOST_TO_SAS_HA(shost);
 
<------>sha->event_thres = simple_strtol(buf, NULL, 10);
 
<------>/* threshold cannot be set too small */
<------>if (sha->event_thres < 32)
<------><------>sha->event_thres = 32;
 
<------>return count;
}
 
DEVICE_ATTR(phy_event_threshold,
<------>S_IRUGO|S_IWUSR,
<------>phy_event_threshold_show,
<------>phy_event_threshold_store);
EXPORT_SYMBOL_GPL(dev_attr_phy_event_threshold);
 
struct scsi_transport_template *
sas_domain_attach_transport(struct sas_domain_function_template *dft)
{
<------>struct scsi_transport_template *stt = sas_attach_transport(&sft);
<------>struct sas_internal *i;
 
<------>if (!stt)
<------><------>return stt;
 
<------>i = to_sas_internal(stt);
<------>i->dft = dft;
<------>stt->create_work_queue = 1;
<------>stt->eh_strategy_handler = sas_scsi_recover_host;
 
<------>return stt;
}
EXPORT_SYMBOL_GPL(sas_domain_attach_transport);
 
static struct asd_sas_event *__sas_alloc_event(struct asd_sas_phy *phy,
<------><------><------><------><------>       gfp_t gfp_flags)
{
<------>struct asd_sas_event *event;
<------>struct sas_ha_struct *sas_ha = phy->ha;
<------>struct sas_internal *i =
<------><------>to_sas_internal(sas_ha->core.shost->transportt);
 
<------>event = kmem_cache_zalloc(sas_event_cache, gfp_flags);
<------>if (!event)
<------><------>return NULL;
 
<------>atomic_inc(&phy->event_nr);
 
<------>if (atomic_read(&phy->event_nr) > phy->ha->event_thres) {
<------><------>if (i->dft->lldd_control_phy) {
<------><------><------>if (cmpxchg(&phy->in_shutdown, 0, 1) == 0) {
<------><------><------><------>pr_notice("The phy%d bursting events, shut it down.\n",
<------><------><------><------><------>  phy->id);
<------><------><------><------>sas_notify_phy_event_gfp(phy, PHYE_SHUTDOWN,
<------><------><------><------><------><------><------> gfp_flags);
<------><------><------>}
<------><------>} else {
<------><------><------>/* Do not support PHY control, stop allocating events */
<------><------><------>WARN_ONCE(1, "PHY control not supported.\n");
<------><------><------>kmem_cache_free(sas_event_cache, event);
<------><------><------>atomic_dec(&phy->event_nr);
<------><------><------>event = NULL;
<------><------>}
<------>}
 
<------>return event;
}
 
struct asd_sas_event *sas_alloc_event(struct asd_sas_phy *phy)
{
<------>return __sas_alloc_event(phy, in_interrupt() ? GFP_ATOMIC : GFP_KERNEL);
}
 
struct asd_sas_event *sas_alloc_event_gfp(struct asd_sas_phy *phy,
<------><------><------><------><------>  gfp_t gfp_flags)
{
<------>return __sas_alloc_event(phy, gfp_flags);
}
 
void sas_free_event(struct asd_sas_event *event)
{
<------>struct asd_sas_phy *phy = event->phy;
 
<------>kmem_cache_free(sas_event_cache, event);
<------>atomic_dec(&phy->event_nr);
}
 
/* ---------- SAS Class register/unregister ---------- */
 
static int __init sas_class_init(void)
{
<------>sas_task_cache = KMEM_CACHE(sas_task, SLAB_HWCACHE_ALIGN);
<------>if (!sas_task_cache)
<------><------>goto out;
 
<------>sas_event_cache = KMEM_CACHE(asd_sas_event, SLAB_HWCACHE_ALIGN);
<------>if (!sas_event_cache)
<------><------>goto free_task_kmem;
 
<------>return 0;
free_task_kmem:
<------>kmem_cache_destroy(sas_task_cache);
out:
<------>return -ENOMEM;
}
 
static void __exit sas_class_exit(void)
{
<------>kmem_cache_destroy(sas_task_cache);
<------>kmem_cache_destroy(sas_event_cache);
}
 
MODULE_AUTHOR("Luben Tuikov <luben_tuikov@adaptec.com>");
MODULE_DESCRIPTION("SAS Transport Layer");
MODULE_LICENSE("GPL v2");
 
module_init(sas_class_init);
module_exit(sas_class_exit);
 
EXPORT_SYMBOL_GPL(sas_register_ha);
EXPORT_SYMBOL_GPL(sas_unregister_ha);