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![Jason Yan](/assets/img/avatar_default.png)
Commit2623c7a5f2
("libata: add refcounting to ata_host") v4.17+ introduced refcounting to ata_host and will increase or decrease the refcount when adding or deleting transport ATA port. Now the ata host for libsas is embedded in domain_device, and the ->kref member is not initialized. Afer we add ata transport class, ata_host_get() will be called when adding transport ATA port and a warning will be triggered as below: refcount_t: increment on 0; use-after-free. WARNING: CPU: 2 PID: 103 at lib/refcount.c:153 refcount_inc+0x40/0x48 ...... Call trace: refcount_inc+0x40/0x48 ata_host_get+0x10/0x18 ata_tport_add+0x40/0x120 ata_sas_tport_add+0xc/0x14 sas_ata_init+0x7c/0xc8 sas_discover_domain+0x380/0x53c process_one_work+0x12c/0x288 worker_thread+0x58/0x3f0 kthread+0xfc/0x128 ret_from_fork+0x10/0x18 And also when removing transport ATA port ata_host_put() will be called and another similar warning will be triggered. If the refcount decreased to zero, the ata host will be freed. But this ata host is only part of domain_device, it cannot be freed directly. So we have to change this embedded static ata host to a dynamically allocated ata host and initialize the ->kref member. To use ata_host_get() and ata_host_put() in libsas, we need to move the declaration of these functions to the public libata.h and export them. Fixes:b6240a4df0
("scsi: libsas: add transport class for ATA devices") Signed-off-by: Jason Yan <yanaijie@huawei.com> CC: John Garry <john.garry@huawei.com> CC: Taras Kondratiuk <takondra@cisco.com> CC: Tejun Heo <tj@kernel.org> Acked-by: Tejun Heo <tj@kernel.org> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
600 lines
16 KiB
C
600 lines
16 KiB
C
/*
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* Serial Attached SCSI (SAS) Discover process
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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/scatterlist.h>
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#include <linux/slab.h>
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#include <linux/async.h>
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#include <scsi/scsi_host.h>
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#include <scsi/scsi_eh.h>
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#include "sas_internal.h"
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#include <scsi/scsi_transport.h>
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#include <scsi/scsi_transport_sas.h>
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#include <scsi/sas_ata.h>
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#include "../scsi_sas_internal.h"
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/* ---------- Basic task processing for discovery purposes ---------- */
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void sas_init_dev(struct domain_device *dev)
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{
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switch (dev->dev_type) {
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case SAS_END_DEVICE:
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INIT_LIST_HEAD(&dev->ssp_dev.eh_list_node);
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break;
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case SAS_EDGE_EXPANDER_DEVICE:
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case SAS_FANOUT_EXPANDER_DEVICE:
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INIT_LIST_HEAD(&dev->ex_dev.children);
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mutex_init(&dev->ex_dev.cmd_mutex);
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break;
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default:
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break;
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}
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}
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/* ---------- Domain device discovery ---------- */
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/**
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* sas_get_port_device - Discover devices which caused port creation
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* @port: pointer to struct sas_port of interest
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*
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* Devices directly attached to a HA port, have no parent. This is
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* how we know they are (domain) "root" devices. All other devices
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* do, and should have their "parent" pointer set appropriately as
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* soon as a child device is discovered.
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*/
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static int sas_get_port_device(struct asd_sas_port *port)
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{
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struct asd_sas_phy *phy;
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struct sas_rphy *rphy;
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struct domain_device *dev;
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int rc = -ENODEV;
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dev = sas_alloc_device();
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if (!dev)
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return -ENOMEM;
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spin_lock_irq(&port->phy_list_lock);
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if (list_empty(&port->phy_list)) {
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spin_unlock_irq(&port->phy_list_lock);
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sas_put_device(dev);
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return -ENODEV;
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}
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phy = container_of(port->phy_list.next, struct asd_sas_phy, port_phy_el);
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spin_lock(&phy->frame_rcvd_lock);
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memcpy(dev->frame_rcvd, phy->frame_rcvd, min(sizeof(dev->frame_rcvd),
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(size_t)phy->frame_rcvd_size));
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spin_unlock(&phy->frame_rcvd_lock);
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spin_unlock_irq(&port->phy_list_lock);
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if (dev->frame_rcvd[0] == 0x34 && port->oob_mode == SATA_OOB_MODE) {
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struct dev_to_host_fis *fis =
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(struct dev_to_host_fis *) dev->frame_rcvd;
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if (fis->interrupt_reason == 1 && fis->lbal == 1 &&
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fis->byte_count_low==0x69 && fis->byte_count_high == 0x96
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&& (fis->device & ~0x10) == 0)
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dev->dev_type = SAS_SATA_PM;
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else
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dev->dev_type = SAS_SATA_DEV;
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dev->tproto = SAS_PROTOCOL_SATA;
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} else {
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struct sas_identify_frame *id =
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(struct sas_identify_frame *) dev->frame_rcvd;
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dev->dev_type = id->dev_type;
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dev->iproto = id->initiator_bits;
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dev->tproto = id->target_bits;
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}
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sas_init_dev(dev);
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dev->port = port;
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switch (dev->dev_type) {
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case SAS_SATA_DEV:
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rc = sas_ata_init(dev);
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if (rc) {
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rphy = NULL;
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break;
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}
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/* fall through */
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case SAS_END_DEVICE:
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rphy = sas_end_device_alloc(port->port);
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break;
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case SAS_EDGE_EXPANDER_DEVICE:
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rphy = sas_expander_alloc(port->port,
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SAS_EDGE_EXPANDER_DEVICE);
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break;
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case SAS_FANOUT_EXPANDER_DEVICE:
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rphy = sas_expander_alloc(port->port,
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SAS_FANOUT_EXPANDER_DEVICE);
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break;
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default:
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printk("ERROR: Unidentified device type %d\n", dev->dev_type);
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rphy = NULL;
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break;
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}
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if (!rphy) {
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sas_put_device(dev);
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return rc;
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}
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rphy->identify.phy_identifier = phy->phy->identify.phy_identifier;
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memcpy(dev->sas_addr, port->attached_sas_addr, SAS_ADDR_SIZE);
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sas_fill_in_rphy(dev, rphy);
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sas_hash_addr(dev->hashed_sas_addr, dev->sas_addr);
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port->port_dev = dev;
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dev->linkrate = port->linkrate;
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dev->min_linkrate = port->linkrate;
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dev->max_linkrate = port->linkrate;
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dev->pathways = port->num_phys;
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memset(port->disc.fanout_sas_addr, 0, SAS_ADDR_SIZE);
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memset(port->disc.eeds_a, 0, SAS_ADDR_SIZE);
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memset(port->disc.eeds_b, 0, SAS_ADDR_SIZE);
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port->disc.max_level = 0;
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sas_device_set_phy(dev, port->port);
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dev->rphy = rphy;
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get_device(&dev->rphy->dev);
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if (dev_is_sata(dev) || dev->dev_type == SAS_END_DEVICE)
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list_add_tail(&dev->disco_list_node, &port->disco_list);
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else {
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spin_lock_irq(&port->dev_list_lock);
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list_add_tail(&dev->dev_list_node, &port->dev_list);
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spin_unlock_irq(&port->dev_list_lock);
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}
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spin_lock_irq(&port->phy_list_lock);
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list_for_each_entry(phy, &port->phy_list, port_phy_el)
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sas_phy_set_target(phy, dev);
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spin_unlock_irq(&port->phy_list_lock);
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return 0;
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}
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/* ---------- Discover and Revalidate ---------- */
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int sas_notify_lldd_dev_found(struct domain_device *dev)
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{
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int res = 0;
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struct sas_ha_struct *sas_ha = dev->port->ha;
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struct Scsi_Host *shost = sas_ha->core.shost;
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struct sas_internal *i = to_sas_internal(shost->transportt);
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if (!i->dft->lldd_dev_found)
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return 0;
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res = i->dft->lldd_dev_found(dev);
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if (res) {
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printk("sas: driver on pcidev %s cannot handle "
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"device %llx, error:%d\n",
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dev_name(sas_ha->dev),
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SAS_ADDR(dev->sas_addr), res);
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}
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set_bit(SAS_DEV_FOUND, &dev->state);
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kref_get(&dev->kref);
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return res;
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}
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void sas_notify_lldd_dev_gone(struct domain_device *dev)
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{
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struct sas_ha_struct *sas_ha = dev->port->ha;
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struct Scsi_Host *shost = sas_ha->core.shost;
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struct sas_internal *i = to_sas_internal(shost->transportt);
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if (!i->dft->lldd_dev_gone)
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return;
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if (test_and_clear_bit(SAS_DEV_FOUND, &dev->state)) {
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i->dft->lldd_dev_gone(dev);
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sas_put_device(dev);
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}
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}
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static void sas_probe_devices(struct asd_sas_port *port)
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{
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struct domain_device *dev, *n;
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/* devices must be domain members before link recovery and probe */
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list_for_each_entry(dev, &port->disco_list, disco_list_node) {
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spin_lock_irq(&port->dev_list_lock);
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list_add_tail(&dev->dev_list_node, &port->dev_list);
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spin_unlock_irq(&port->dev_list_lock);
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}
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sas_probe_sata(port);
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list_for_each_entry_safe(dev, n, &port->disco_list, disco_list_node) {
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int err;
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err = sas_rphy_add(dev->rphy);
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if (err)
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sas_fail_probe(dev, __func__, err);
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else
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list_del_init(&dev->disco_list_node);
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}
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}
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static void sas_suspend_devices(struct work_struct *work)
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{
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struct asd_sas_phy *phy;
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struct domain_device *dev;
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struct sas_discovery_event *ev = to_sas_discovery_event(work);
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struct asd_sas_port *port = ev->port;
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struct Scsi_Host *shost = port->ha->core.shost;
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struct sas_internal *si = to_sas_internal(shost->transportt);
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clear_bit(DISCE_SUSPEND, &port->disc.pending);
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sas_suspend_sata(port);
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/* lldd is free to forget the domain_device across the
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* suspension, we force the issue here to keep the reference
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* counts aligned
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*/
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list_for_each_entry(dev, &port->dev_list, dev_list_node)
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sas_notify_lldd_dev_gone(dev);
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/* we are suspending, so we know events are disabled and
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* phy_list is not being mutated
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*/
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list_for_each_entry(phy, &port->phy_list, port_phy_el) {
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if (si->dft->lldd_port_formed)
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si->dft->lldd_port_deformed(phy);
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phy->suspended = 1;
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port->suspended = 1;
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}
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}
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static void sas_resume_devices(struct work_struct *work)
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{
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struct sas_discovery_event *ev = to_sas_discovery_event(work);
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struct asd_sas_port *port = ev->port;
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clear_bit(DISCE_RESUME, &port->disc.pending);
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sas_resume_sata(port);
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}
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/**
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* sas_discover_end_dev - discover an end device (SSP, etc)
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* @dev: pointer to domain device of interest
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*
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* See comment in sas_discover_sata().
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*/
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int sas_discover_end_dev(struct domain_device *dev)
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{
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int res;
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res = sas_notify_lldd_dev_found(dev);
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if (res)
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return res;
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return 0;
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}
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/* ---------- Device registration and unregistration ---------- */
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void sas_free_device(struct kref *kref)
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{
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struct domain_device *dev = container_of(kref, typeof(*dev), kref);
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put_device(&dev->rphy->dev);
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dev->rphy = NULL;
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if (dev->parent)
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sas_put_device(dev->parent);
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sas_port_put_phy(dev->phy);
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dev->phy = NULL;
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/* remove the phys and ports, everything else should be gone */
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if (dev->dev_type == SAS_EDGE_EXPANDER_DEVICE || dev->dev_type == SAS_FANOUT_EXPANDER_DEVICE)
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kfree(dev->ex_dev.ex_phy);
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if (dev_is_sata(dev) && dev->sata_dev.ap) {
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ata_sas_tport_delete(dev->sata_dev.ap);
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ata_sas_port_destroy(dev->sata_dev.ap);
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ata_host_put(dev->sata_dev.ata_host);
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dev->sata_dev.ata_host = NULL;
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dev->sata_dev.ap = NULL;
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}
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kfree(dev);
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}
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static void sas_unregister_common_dev(struct asd_sas_port *port, struct domain_device *dev)
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{
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struct sas_ha_struct *ha = port->ha;
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sas_notify_lldd_dev_gone(dev);
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if (!dev->parent)
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dev->port->port_dev = NULL;
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else
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list_del_init(&dev->siblings);
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spin_lock_irq(&port->dev_list_lock);
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list_del_init(&dev->dev_list_node);
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if (dev_is_sata(dev))
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sas_ata_end_eh(dev->sata_dev.ap);
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spin_unlock_irq(&port->dev_list_lock);
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spin_lock_irq(&ha->lock);
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if (dev->dev_type == SAS_END_DEVICE &&
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!list_empty(&dev->ssp_dev.eh_list_node)) {
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list_del_init(&dev->ssp_dev.eh_list_node);
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ha->eh_active--;
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}
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spin_unlock_irq(&ha->lock);
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sas_put_device(dev);
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}
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void sas_destruct_devices(struct asd_sas_port *port)
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{
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struct domain_device *dev, *n;
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list_for_each_entry_safe(dev, n, &port->destroy_list, disco_list_node) {
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list_del_init(&dev->disco_list_node);
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sas_remove_children(&dev->rphy->dev);
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sas_rphy_delete(dev->rphy);
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sas_unregister_common_dev(port, dev);
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}
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}
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static void sas_destruct_ports(struct asd_sas_port *port)
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{
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struct sas_port *sas_port, *p;
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list_for_each_entry_safe(sas_port, p, &port->sas_port_del_list, del_list) {
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list_del_init(&sas_port->del_list);
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sas_port_delete(sas_port);
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}
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}
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void sas_unregister_dev(struct asd_sas_port *port, struct domain_device *dev)
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{
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if (!test_bit(SAS_DEV_DESTROY, &dev->state) &&
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!list_empty(&dev->disco_list_node)) {
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/* this rphy never saw sas_rphy_add */
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list_del_init(&dev->disco_list_node);
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sas_rphy_free(dev->rphy);
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sas_unregister_common_dev(port, dev);
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return;
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}
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if (!test_and_set_bit(SAS_DEV_DESTROY, &dev->state)) {
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sas_rphy_unlink(dev->rphy);
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list_move_tail(&dev->disco_list_node, &port->destroy_list);
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}
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}
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void sas_unregister_domain_devices(struct asd_sas_port *port, int gone)
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{
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struct domain_device *dev, *n;
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list_for_each_entry_safe_reverse(dev, n, &port->dev_list, dev_list_node) {
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if (gone)
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set_bit(SAS_DEV_GONE, &dev->state);
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sas_unregister_dev(port, dev);
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}
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list_for_each_entry_safe(dev, n, &port->disco_list, disco_list_node)
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sas_unregister_dev(port, dev);
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port->port->rphy = NULL;
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}
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void sas_device_set_phy(struct domain_device *dev, struct sas_port *port)
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{
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struct sas_ha_struct *ha;
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struct sas_phy *new_phy;
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if (!dev)
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return;
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ha = dev->port->ha;
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new_phy = sas_port_get_phy(port);
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/* pin and record last seen phy */
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spin_lock_irq(&ha->phy_port_lock);
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if (new_phy) {
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sas_port_put_phy(dev->phy);
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dev->phy = new_phy;
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}
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spin_unlock_irq(&ha->phy_port_lock);
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}
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/* ---------- Discovery and Revalidation ---------- */
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/**
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* sas_discover_domain - discover the domain
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* @work: work structure embedded in port domain device.
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*
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* NOTE: this process _must_ quit (return) as soon as any connection
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* errors are encountered. Connection recovery is done elsewhere.
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* Discover process only interrogates devices in order to discover the
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* domain.
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*/
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static void sas_discover_domain(struct work_struct *work)
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{
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struct domain_device *dev;
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int error = 0;
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struct sas_discovery_event *ev = to_sas_discovery_event(work);
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struct asd_sas_port *port = ev->port;
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clear_bit(DISCE_DISCOVER_DOMAIN, &port->disc.pending);
|
|
|
|
if (port->port_dev)
|
|
return;
|
|
|
|
error = sas_get_port_device(port);
|
|
if (error)
|
|
return;
|
|
dev = port->port_dev;
|
|
|
|
SAS_DPRINTK("DOING DISCOVERY on port %d, pid:%d\n", port->id,
|
|
task_pid_nr(current));
|
|
|
|
switch (dev->dev_type) {
|
|
case SAS_END_DEVICE:
|
|
error = sas_discover_end_dev(dev);
|
|
break;
|
|
case SAS_EDGE_EXPANDER_DEVICE:
|
|
case SAS_FANOUT_EXPANDER_DEVICE:
|
|
error = sas_discover_root_expander(dev);
|
|
break;
|
|
case SAS_SATA_DEV:
|
|
case SAS_SATA_PM:
|
|
#ifdef CONFIG_SCSI_SAS_ATA
|
|
error = sas_discover_sata(dev);
|
|
break;
|
|
#else
|
|
SAS_DPRINTK("ATA device seen but CONFIG_SCSI_SAS_ATA=N so cannot attach\n");
|
|
/* Fall through */
|
|
#endif
|
|
default:
|
|
error = -ENXIO;
|
|
SAS_DPRINTK("unhandled device %d\n", dev->dev_type);
|
|
break;
|
|
}
|
|
|
|
if (error) {
|
|
sas_rphy_free(dev->rphy);
|
|
list_del_init(&dev->disco_list_node);
|
|
spin_lock_irq(&port->dev_list_lock);
|
|
list_del_init(&dev->dev_list_node);
|
|
spin_unlock_irq(&port->dev_list_lock);
|
|
|
|
sas_put_device(dev);
|
|
port->port_dev = NULL;
|
|
}
|
|
|
|
sas_probe_devices(port);
|
|
|
|
SAS_DPRINTK("DONE DISCOVERY on port %d, pid:%d, result:%d\n", port->id,
|
|
task_pid_nr(current), error);
|
|
}
|
|
|
|
static void sas_revalidate_domain(struct work_struct *work)
|
|
{
|
|
int res = 0;
|
|
struct sas_discovery_event *ev = to_sas_discovery_event(work);
|
|
struct asd_sas_port *port = ev->port;
|
|
struct sas_ha_struct *ha = port->ha;
|
|
struct domain_device *ddev = port->port_dev;
|
|
|
|
/* prevent revalidation from finding sata links in recovery */
|
|
mutex_lock(&ha->disco_mutex);
|
|
if (test_bit(SAS_HA_ATA_EH_ACTIVE, &ha->state)) {
|
|
SAS_DPRINTK("REVALIDATION DEFERRED on port %d, pid:%d\n",
|
|
port->id, task_pid_nr(current));
|
|
goto out;
|
|
}
|
|
|
|
clear_bit(DISCE_REVALIDATE_DOMAIN, &port->disc.pending);
|
|
|
|
SAS_DPRINTK("REVALIDATING DOMAIN on port %d, pid:%d\n", port->id,
|
|
task_pid_nr(current));
|
|
|
|
if (ddev && (ddev->dev_type == SAS_FANOUT_EXPANDER_DEVICE ||
|
|
ddev->dev_type == SAS_EDGE_EXPANDER_DEVICE))
|
|
res = sas_ex_revalidate_domain(ddev);
|
|
|
|
SAS_DPRINTK("done REVALIDATING DOMAIN on port %d, pid:%d, res 0x%x\n",
|
|
port->id, task_pid_nr(current), res);
|
|
out:
|
|
mutex_unlock(&ha->disco_mutex);
|
|
|
|
sas_destruct_devices(port);
|
|
sas_destruct_ports(port);
|
|
sas_probe_devices(port);
|
|
}
|
|
|
|
/* ---------- Events ---------- */
|
|
|
|
static void sas_chain_work(struct sas_ha_struct *ha, struct sas_work *sw)
|
|
{
|
|
/* chained work is not subject to SA_HA_DRAINING or
|
|
* SAS_HA_REGISTERED, because it is either submitted in the
|
|
* workqueue, or known to be submitted from a context that is
|
|
* not racing against draining
|
|
*/
|
|
queue_work(ha->disco_q, &sw->work);
|
|
}
|
|
|
|
static void sas_chain_event(int event, unsigned long *pending,
|
|
struct sas_work *sw,
|
|
struct sas_ha_struct *ha)
|
|
{
|
|
if (!test_and_set_bit(event, pending)) {
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&ha->lock, flags);
|
|
sas_chain_work(ha, sw);
|
|
spin_unlock_irqrestore(&ha->lock, flags);
|
|
}
|
|
}
|
|
|
|
int sas_discover_event(struct asd_sas_port *port, enum discover_event ev)
|
|
{
|
|
struct sas_discovery *disc;
|
|
|
|
if (!port)
|
|
return 0;
|
|
disc = &port->disc;
|
|
|
|
BUG_ON(ev >= DISC_NUM_EVENTS);
|
|
|
|
sas_chain_event(ev, &disc->pending, &disc->disc_work[ev].work, port->ha);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* sas_init_disc - initialize the discovery struct in the port
|
|
* @disc: port discovery structure
|
|
* @port: pointer to struct port
|
|
*
|
|
* Called when the ports are being initialized.
|
|
*/
|
|
void sas_init_disc(struct sas_discovery *disc, struct asd_sas_port *port)
|
|
{
|
|
int i;
|
|
|
|
static const work_func_t sas_event_fns[DISC_NUM_EVENTS] = {
|
|
[DISCE_DISCOVER_DOMAIN] = sas_discover_domain,
|
|
[DISCE_REVALIDATE_DOMAIN] = sas_revalidate_domain,
|
|
[DISCE_SUSPEND] = sas_suspend_devices,
|
|
[DISCE_RESUME] = sas_resume_devices,
|
|
};
|
|
|
|
disc->pending = 0;
|
|
for (i = 0; i < DISC_NUM_EVENTS; i++) {
|
|
INIT_SAS_WORK(&disc->disc_work[i].work, sas_event_fns[i]);
|
|
disc->disc_work[i].port = port;
|
|
}
|
|
}
|