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Events will be added to defer_q list when setting ha->status to SAS_HA_DRAINING. Events will be called after drain workqueue. Those events are added to the head of list, but they are scanned one by one from the head to the tail, which will cause those events be called in the reverse order of being added. So change list_add to list_add_tail in function sas_queue_work. Signed-off-by: chenxiang <chenxiang66@hisilicon.com> Signed-off-by: Jason Yan <yanaijie@huawei.com> CC: John Garry <john.garry@huawei.com> CC: Johannes Thumshirn <jthumshirn@suse.de> CC: Ewan Milne <emilne@redhat.com> CC: Christoph Hellwig <hch@lst.de> CC: Tomas Henzl <thenzl@redhat.com> CC: Dan Williams <dan.j.williams@intel.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
153 lines
3.8 KiB
C
153 lines
3.8 KiB
C
/*
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* Serial Attached SCSI (SAS) Event processing
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*
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* Copyright (C) 2005 Adaptec, Inc. All rights reserved.
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* Copyright (C) 2005 Luben Tuikov <luben_tuikov@adaptec.com>
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*
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* This file is licensed under GPLv2.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*/
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#include <linux/export.h>
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#include <scsi/scsi_host.h>
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#include "sas_internal.h"
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#include "sas_dump.h"
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int sas_queue_work(struct sas_ha_struct *ha, struct sas_work *sw)
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{
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int rc = 0;
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if (!test_bit(SAS_HA_REGISTERED, &ha->state))
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return 0;
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if (test_bit(SAS_HA_DRAINING, &ha->state)) {
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/* add it to the defer list, if not already pending */
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if (list_empty(&sw->drain_node))
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list_add_tail(&sw->drain_node, &ha->defer_q);
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} else
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rc = scsi_queue_work(ha->core.shost, &sw->work);
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return rc;
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}
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static int sas_queue_event(int event, unsigned long *pending,
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struct sas_work *work,
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struct sas_ha_struct *ha)
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{
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int rc = 0;
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if (!test_and_set_bit(event, pending)) {
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unsigned long flags;
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spin_lock_irqsave(&ha->lock, flags);
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rc = sas_queue_work(ha, work);
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spin_unlock_irqrestore(&ha->lock, flags);
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}
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return rc;
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}
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void __sas_drain_work(struct sas_ha_struct *ha)
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{
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struct workqueue_struct *wq = ha->core.shost->work_q;
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struct sas_work *sw, *_sw;
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set_bit(SAS_HA_DRAINING, &ha->state);
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/* flush submitters */
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spin_lock_irq(&ha->lock);
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spin_unlock_irq(&ha->lock);
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drain_workqueue(wq);
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spin_lock_irq(&ha->lock);
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clear_bit(SAS_HA_DRAINING, &ha->state);
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list_for_each_entry_safe(sw, _sw, &ha->defer_q, drain_node) {
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list_del_init(&sw->drain_node);
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sas_queue_work(ha, sw);
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}
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spin_unlock_irq(&ha->lock);
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}
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int sas_drain_work(struct sas_ha_struct *ha)
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{
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int err;
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err = mutex_lock_interruptible(&ha->drain_mutex);
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if (err)
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return err;
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if (test_bit(SAS_HA_REGISTERED, &ha->state))
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__sas_drain_work(ha);
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mutex_unlock(&ha->drain_mutex);
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return 0;
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}
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EXPORT_SYMBOL_GPL(sas_drain_work);
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void sas_disable_revalidation(struct sas_ha_struct *ha)
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{
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mutex_lock(&ha->disco_mutex);
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set_bit(SAS_HA_ATA_EH_ACTIVE, &ha->state);
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mutex_unlock(&ha->disco_mutex);
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}
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void sas_enable_revalidation(struct sas_ha_struct *ha)
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{
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int i;
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mutex_lock(&ha->disco_mutex);
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clear_bit(SAS_HA_ATA_EH_ACTIVE, &ha->state);
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for (i = 0; i < ha->num_phys; i++) {
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struct asd_sas_port *port = ha->sas_port[i];
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const int ev = DISCE_REVALIDATE_DOMAIN;
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struct sas_discovery *d = &port->disc;
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if (!test_and_clear_bit(ev, &d->pending))
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continue;
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sas_queue_event(ev, &d->pending, &d->disc_work[ev].work, ha);
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}
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mutex_unlock(&ha->disco_mutex);
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}
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static int sas_notify_port_event(struct asd_sas_phy *phy, enum port_event event)
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{
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struct sas_ha_struct *ha = phy->ha;
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BUG_ON(event >= PORT_NUM_EVENTS);
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return sas_queue_event(event, &phy->port_events_pending,
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&phy->port_events[event].work, ha);
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}
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int sas_notify_phy_event(struct asd_sas_phy *phy, enum phy_event event)
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{
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struct sas_ha_struct *ha = phy->ha;
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BUG_ON(event >= PHY_NUM_EVENTS);
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return sas_queue_event(event, &phy->phy_events_pending,
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&phy->phy_events[event].work, ha);
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}
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int sas_init_events(struct sas_ha_struct *sas_ha)
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{
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sas_ha->notify_port_event = sas_notify_port_event;
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sas_ha->notify_phy_event = sas_notify_phy_event;
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return 0;
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}
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