/* * Support for SATA devices on Serial Attached SCSI (SAS) controllers * * Copyright (C) 2006 IBM Corporation * * Written by: Darrick J. Wong , IBM Corporation * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as * published by the Free Software Foundation; either version 2 of the * License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 * USA */ #include #include #include #include #include #include "sas_internal.h" #include #include #include #include #include #include #include "../scsi_sas_internal.h" #include "../scsi_transport_api.h" #include static enum ata_completion_errors sas_to_ata_err(struct task_status_struct *ts) { /* Cheesy attempt to translate SAS errors into ATA. Hah! */ /* transport error */ if (ts->resp == SAS_TASK_UNDELIVERED) return AC_ERR_ATA_BUS; /* ts->resp == SAS_TASK_COMPLETE */ /* task delivered, what happened afterwards? */ switch (ts->stat) { case SAS_DEV_NO_RESPONSE: return AC_ERR_TIMEOUT; case SAS_INTERRUPTED: case SAS_PHY_DOWN: case SAS_NAK_R_ERR: return AC_ERR_ATA_BUS; case SAS_DATA_UNDERRUN: /* * Some programs that use the taskfile interface * (smartctl in particular) can cause underrun * problems. Ignore these errors, perhaps at our * peril. */ return 0; case SAS_DATA_OVERRUN: case SAS_QUEUE_FULL: case SAS_DEVICE_UNKNOWN: case SAS_SG_ERR: return AC_ERR_INVALID; case SAS_OPEN_TO: case SAS_OPEN_REJECT: SAS_DPRINTK("%s: Saw error %d. What to do?\n", __func__, ts->stat); return AC_ERR_OTHER; case SAM_STAT_CHECK_CONDITION: case SAS_ABORTED_TASK: return AC_ERR_DEV; case SAS_PROTO_RESPONSE: /* This means the ending_fis has the error * value; return 0 here to collect it */ return 0; default: return 0; } } static void sas_ata_task_done(struct sas_task *task) { struct ata_queued_cmd *qc = task->uldd_task; struct domain_device *dev = task->dev; struct task_status_struct *stat = &task->task_status; struct ata_task_resp *resp = (struct ata_task_resp *)stat->buf; struct sas_ha_struct *sas_ha = dev->port->ha; enum ata_completion_errors ac; unsigned long flags; struct ata_link *link; struct ata_port *ap; spin_lock_irqsave(&dev->done_lock, flags); if (test_bit(SAS_HA_FROZEN, &sas_ha->state)) task = NULL; else if (qc && qc->scsicmd) ASSIGN_SAS_TASK(qc->scsicmd, NULL); spin_unlock_irqrestore(&dev->done_lock, flags); /* check if libsas-eh got to the task before us */ if (unlikely(!task)) return; if (!qc) goto qc_already_gone; ap = qc->ap; link = &ap->link; spin_lock_irqsave(ap->lock, flags); /* check if we lost the race with libata/sas_ata_post_internal() */ if (unlikely(ap->pflags & ATA_PFLAG_FROZEN)) { spin_unlock_irqrestore(ap->lock, flags); if (qc->scsicmd) goto qc_already_gone; else { /* if eh is not involved and the port is frozen then the * ata internal abort process has taken responsibility * for this sas_task */ return; } } if (stat->stat == SAS_PROTO_RESPONSE || stat->stat == SAM_STAT_GOOD || ((stat->stat == SAM_STAT_CHECK_CONDITION && dev->sata_dev.class == ATA_DEV_ATAPI))) { memcpy(dev->sata_dev.fis, resp->ending_fis, ATA_RESP_FIS_SIZE); if (!link->sactive) { qc->err_mask |= ac_err_mask(dev->sata_dev.fis[2]); } else { link->eh_info.err_mask |= ac_err_mask(dev->sata_dev.fis[2]); if (unlikely(link->eh_info.err_mask)) qc->flags |= ATA_QCFLAG_FAILED; } } else { ac = sas_to_ata_err(stat); if (ac) { SAS_DPRINTK("%s: SAS error %x\n", __func__, stat->stat); /* We saw a SAS error. Send a vague error. */ if (!link->sactive) { qc->err_mask = ac; } else { link->eh_info.err_mask |= AC_ERR_DEV; qc->flags |= ATA_QCFLAG_FAILED; } dev->sata_dev.fis[3] = 0x04; /* status err */ dev->sata_dev.fis[2] = ATA_ERR; } } qc->lldd_task = NULL; ata_qc_complete(qc); spin_unlock_irqrestore(ap->lock, flags); qc_already_gone: sas_free_task(task); } static unsigned int sas_ata_qc_issue(struct ata_queued_cmd *qc) { unsigned long flags; struct sas_task *task; struct scatterlist *sg; int ret = AC_ERR_SYSTEM; unsigned int si, xfer = 0; struct ata_port *ap = qc->ap; struct domain_device *dev = ap->private_data; struct sas_ha_struct *sas_ha = dev->port->ha; struct Scsi_Host *host = sas_ha->core.shost; struct sas_internal *i = to_sas_internal(host->transportt); /* TODO: audit callers to ensure they are ready for qc_issue to * unconditionally re-enable interrupts */ local_irq_save(flags); spin_unlock(ap->lock); /* If the device fell off, no sense in issuing commands */ if (test_bit(SAS_DEV_GONE, &dev->state)) goto out; task = sas_alloc_task(GFP_ATOMIC); if (!task) goto out; task->dev = dev; task->task_proto = SAS_PROTOCOL_STP; task->task_done = sas_ata_task_done; if (qc->tf.command == ATA_CMD_FPDMA_WRITE || qc->tf.command == ATA_CMD_FPDMA_READ || qc->tf.command == ATA_CMD_FPDMA_RECV || qc->tf.command == ATA_CMD_FPDMA_SEND || qc->tf.command == ATA_CMD_NCQ_NON_DATA) { /* Need to zero out the tag libata assigned us */ qc->tf.nsect = 0; } ata_tf_to_fis(&qc->tf, qc->dev->link->pmp, 1, (u8 *)&task->ata_task.fis); task->uldd_task = qc; if (ata_is_atapi(qc->tf.protocol)) { memcpy(task->ata_task.atapi_packet, qc->cdb, qc->dev->cdb_len); task->total_xfer_len = qc->nbytes; task->num_scatter = qc->n_elem; task->data_dir = qc->dma_dir; } else if (!ata_is_data(qc->tf.protocol)) { task->data_dir = DMA_NONE; } else { for_each_sg(qc->sg, sg, qc->n_elem, si) xfer += sg_dma_len(sg); task->total_xfer_len = xfer; task->num_scatter = si; task->data_dir = qc->dma_dir; } task->scatter = qc->sg; task->ata_task.retry_count = 1; task->task_state_flags = SAS_TASK_STATE_PENDING; qc->lldd_task = task; task->ata_task.use_ncq = ata_is_ncq(qc->tf.protocol); task->ata_task.dma_xfer = ata_is_dma(qc->tf.protocol); if (qc->scsicmd) ASSIGN_SAS_TASK(qc->scsicmd, task); ret = i->dft->lldd_execute_task(task, GFP_ATOMIC); if (ret) { SAS_DPRINTK("lldd_execute_task returned: %d\n", ret); if (qc->scsicmd) ASSIGN_SAS_TASK(qc->scsicmd, NULL); sas_free_task(task); qc->lldd_task = NULL; ret = AC_ERR_SYSTEM; } out: spin_lock(ap->lock); local_irq_restore(flags); return ret; } static bool sas_ata_qc_fill_rtf(struct ata_queued_cmd *qc) { struct domain_device *dev = qc->ap->private_data; ata_tf_from_fis(dev->sata_dev.fis, &qc->result_tf); return true; } static struct sas_internal *dev_to_sas_internal(struct domain_device *dev) { return to_sas_internal(dev->port->ha->core.shost->transportt); } static int sas_get_ata_command_set(struct domain_device *dev); int sas_get_ata_info(struct domain_device *dev, struct ex_phy *phy) { if (phy->attached_tproto & SAS_PROTOCOL_STP) dev->tproto = phy->attached_tproto; if (phy->attached_sata_dev) dev->tproto |= SAS_SATA_DEV; if (phy->attached_dev_type == SAS_SATA_PENDING) dev->dev_type = SAS_SATA_PENDING; else { int res; dev->dev_type = SAS_SATA_DEV; res = sas_get_report_phy_sata(dev->parent, phy->phy_id, &dev->sata_dev.rps_resp); if (res) { SAS_DPRINTK("report phy sata to %016llx:0x%x returned " "0x%x\n", SAS_ADDR(dev->parent->sas_addr), phy->phy_id, res); return res; } memcpy(dev->frame_rcvd, &dev->sata_dev.rps_resp.rps.fis, sizeof(struct dev_to_host_fis)); dev->sata_dev.class = sas_get_ata_command_set(dev); } return 0; } static int sas_ata_clear_pending(struct domain_device *dev, struct ex_phy *phy) { int res; /* we weren't pending, so successfully end the reset sequence now */ if (dev->dev_type != SAS_SATA_PENDING) return 1; /* hmmm, if this succeeds do we need to repost the domain_device to the * lldd so it can pick up new parameters? */ res = sas_get_ata_info(dev, phy); if (res) return 0; /* retry */ else return 1; } static int smp_ata_check_ready(struct ata_link *link) { int res; struct ata_port *ap = link->ap; struct domain_device *dev = ap->private_data; struct domain_device *ex_dev = dev->parent; struct sas_phy *phy = sas_get_local_phy(dev); struct ex_phy *ex_phy = &ex_dev->ex_dev.ex_phy[phy->number]; res = sas_ex_phy_discover(ex_dev, phy->number); sas_put_local_phy(phy); /* break the wait early if the expander is unreachable, * otherwise keep polling */ if (res == -ECOMM) return res; if (res != SMP_RESP_FUNC_ACC) return 0; switch (ex_phy->attached_dev_type) { case SAS_SATA_PENDING: return 0; case SAS_END_DEVICE: if (ex_phy->attached_sata_dev) return sas_ata_clear_pending(dev, ex_phy); default: return -ENODEV; } } static int local_ata_check_ready(struct ata_link *link) { struct ata_port *ap = link->ap; struct domain_device *dev = ap->private_data; struct sas_internal *i = dev_to_sas_internal(dev); if (i->dft->lldd_ata_check_ready) return i->dft->lldd_ata_check_ready(dev); else { /* lldd's that don't implement 'ready' checking get the * old default behavior of not coordinating reset * recovery with libata */ return 1; } } static int sas_ata_printk(const char *level, const struct domain_device *ddev, const char *fmt, ...) { struct ata_port *ap = ddev->sata_dev.ap; struct device *dev = &ddev->rphy->dev; struct va_format vaf; va_list args; int r; va_start(args, fmt); vaf.fmt = fmt; vaf.va = &args; r = printk("%ssas: ata%u: %s: %pV", level, ap->print_id, dev_name(dev), &vaf); va_end(args); return r; } static int sas_ata_hard_reset(struct ata_link *link, unsigned int *class, unsigned long deadline) { int ret = 0, res; struct sas_phy *phy; struct ata_port *ap = link->ap; int (*check_ready)(struct ata_link *link); struct domain_device *dev = ap->private_data; struct sas_internal *i = dev_to_sas_internal(dev); res = i->dft->lldd_I_T_nexus_reset(dev); if (res == -ENODEV) return res; if (res != TMF_RESP_FUNC_COMPLETE) sas_ata_printk(KERN_DEBUG, dev, "Unable to reset ata device?\n"); phy = sas_get_local_phy(dev); if (scsi_is_sas_phy_local(phy)) check_ready = local_ata_check_ready; else check_ready = smp_ata_check_ready; sas_put_local_phy(phy); ret = ata_wait_after_reset(link, deadline, check_ready); if (ret && ret != -EAGAIN) sas_ata_printk(KERN_ERR, dev, "reset failed (errno=%d)\n", ret); *class = dev->sata_dev.class; ap->cbl = ATA_CBL_SATA; return ret; } /* * notify the lldd to forget the sas_task for this internal ata command * that bypasses scsi-eh */ static void sas_ata_internal_abort(struct sas_task *task) { struct sas_internal *si = dev_to_sas_internal(task->dev); unsigned long flags; int res; spin_lock_irqsave(&task->task_state_lock, flags); if (task->task_state_flags & SAS_TASK_STATE_ABORTED || task->task_state_flags & SAS_TASK_STATE_DONE) { spin_unlock_irqrestore(&task->task_state_lock, flags); SAS_DPRINTK("%s: Task %p already finished.\n", __func__, task); goto out; } task->task_state_flags |= SAS_TASK_STATE_ABORTED; spin_unlock_irqrestore(&task->task_state_lock, flags); res = si->dft->lldd_abort_task(task); spin_lock_irqsave(&task->task_state_lock, flags); if (task->task_state_flags & SAS_TASK_STATE_DONE || res == TMF_RESP_FUNC_COMPLETE) { spin_unlock_irqrestore(&task->task_state_lock, flags); goto out; } /* XXX we are not prepared to deal with ->lldd_abort_task() * failures. TODO: lldds need to unconditionally forget about * aborted ata tasks, otherwise we (likely) leak the sas task * here */ SAS_DPRINTK("%s: Task %p leaked.\n", __func__, task); if (!(task->task_state_flags & SAS_TASK_STATE_DONE)) task->task_state_flags &= ~SAS_TASK_STATE_ABORTED; spin_unlock_irqrestore(&task->task_state_lock, flags); return; out: sas_free_task(task); } static void sas_ata_post_internal(struct ata_queued_cmd *qc) { if (qc->flags & ATA_QCFLAG_FAILED) qc->err_mask |= AC_ERR_OTHER; if (qc->err_mask) { /* * Find the sas_task and kill it. By this point, libata * has decided to kill the qc and has frozen the port. * In this state sas_ata_task_done() will no longer free * the sas_task, so we need to notify the lldd (via * ->lldd_abort_task) that the task is dead and free it * ourselves. */ struct sas_task *task = qc->lldd_task; qc->lldd_task = NULL; if (!task) return; task->uldd_task = NULL; sas_ata_internal_abort(task); } } static void sas_ata_set_dmamode(struct ata_port *ap, struct ata_device *ata_dev) { struct domain_device *dev = ap->private_data; struct sas_internal *i = dev_to_sas_internal(dev); if (i->dft->lldd_ata_set_dmamode) i->dft->lldd_ata_set_dmamode(dev); } static void sas_ata_sched_eh(struct ata_port *ap) { struct domain_device *dev = ap->private_data; struct sas_ha_struct *ha = dev->port->ha; unsigned long flags; spin_lock_irqsave(&ha->lock, flags); if (!test_and_set_bit(SAS_DEV_EH_PENDING, &dev->state)) ha->eh_active++; ata_std_sched_eh(ap); spin_unlock_irqrestore(&ha->lock, flags); } void sas_ata_end_eh(struct ata_port *ap) { struct domain_device *dev = ap->private_data; struct sas_ha_struct *ha = dev->port->ha; unsigned long flags; spin_lock_irqsave(&ha->lock, flags); if (test_and_clear_bit(SAS_DEV_EH_PENDING, &dev->state)) ha->eh_active--; spin_unlock_irqrestore(&ha->lock, flags); } static struct ata_port_operations sas_sata_ops = { .prereset = ata_std_prereset, .hardreset = sas_ata_hard_reset, .postreset = ata_std_postreset, .error_handler = ata_std_error_handler, .post_internal_cmd = sas_ata_post_internal, .qc_defer = ata_std_qc_defer, .qc_prep = ata_noop_qc_prep, .qc_issue = sas_ata_qc_issue, .qc_fill_rtf = sas_ata_qc_fill_rtf, .port_start = ata_sas_port_start, .port_stop = ata_sas_port_stop, .set_dmamode = sas_ata_set_dmamode, .sched_eh = sas_ata_sched_eh, .end_eh = sas_ata_end_eh, }; static struct ata_port_info sata_port_info = { .flags = ATA_FLAG_SATA | ATA_FLAG_PIO_DMA | ATA_FLAG_NCQ | ATA_FLAG_SAS_HOST | ATA_FLAG_FPDMA_AUX, .pio_mask = ATA_PIO4, .mwdma_mask = ATA_MWDMA2, .udma_mask = ATA_UDMA6, .port_ops = &sas_sata_ops }; int sas_ata_init(struct domain_device *found_dev) { struct sas_ha_struct *ha = found_dev->port->ha; struct Scsi_Host *shost = ha->core.shost; struct ata_port *ap; int rc; ata_host_init(&found_dev->sata_dev.ata_host, ha->dev, &sas_sata_ops); ap = ata_sas_port_alloc(&found_dev->sata_dev.ata_host, &sata_port_info, shost); if (!ap) { SAS_DPRINTK("ata_sas_port_alloc failed.\n"); return -ENODEV; } ap->private_data = found_dev; ap->cbl = ATA_CBL_SATA; ap->scsi_host = shost; rc = ata_sas_port_init(ap); if (rc) { ata_sas_port_destroy(ap); return rc; } found_dev->sata_dev.ap = ap; return 0; } void sas_ata_task_abort(struct sas_task *task) { struct ata_queued_cmd *qc = task->uldd_task; struct completion *waiting; /* Bounce SCSI-initiated commands to the SCSI EH */ if (qc->scsicmd) { struct request_queue *q = qc->scsicmd->device->request_queue; unsigned long flags; spin_lock_irqsave(q->queue_lock, flags); blk_abort_request(qc->scsicmd->request); spin_unlock_irqrestore(q->queue_lock, flags); return; } /* Internal command, fake a timeout and complete. */ qc->flags &= ~ATA_QCFLAG_ACTIVE; qc->flags |= ATA_QCFLAG_FAILED; qc->err_mask |= AC_ERR_TIMEOUT; waiting = qc->private_data; complete(waiting); } static int sas_get_ata_command_set(struct domain_device *dev) { struct dev_to_host_fis *fis = (struct dev_to_host_fis *) dev->frame_rcvd; struct ata_taskfile tf; if (dev->dev_type == SAS_SATA_PENDING) return ATA_DEV_UNKNOWN; ata_tf_from_fis((const u8 *)fis, &tf); return ata_dev_classify(&tf); } void sas_probe_sata(struct asd_sas_port *port) { struct domain_device *dev, *n; mutex_lock(&port->ha->disco_mutex); list_for_each_entry(dev, &port->disco_list, disco_list_node) { if (!dev_is_sata(dev)) continue; ata_sas_async_probe(dev->sata_dev.ap); } mutex_unlock(&port->ha->disco_mutex); list_for_each_entry_safe(dev, n, &port->disco_list, disco_list_node) { if (!dev_is_sata(dev)) continue; sas_ata_wait_eh(dev); /* if libata could not bring the link up, don't surface * the device */ if (ata_dev_disabled(sas_to_ata_dev(dev))) sas_fail_probe(dev, __func__, -ENODEV); } } static void sas_ata_flush_pm_eh(struct asd_sas_port *port, const char *func) { struct domain_device *dev, *n; list_for_each_entry_safe(dev, n, &port->dev_list, dev_list_node) { if (!dev_is_sata(dev)) continue; sas_ata_wait_eh(dev); /* if libata failed to power manage the device, tear it down */ if (ata_dev_disabled(sas_to_ata_dev(dev))) sas_fail_probe(dev, func, -ENODEV); } } void sas_suspend_sata(struct asd_sas_port *port) { struct domain_device *dev; mutex_lock(&port->ha->disco_mutex); list_for_each_entry(dev, &port->dev_list, dev_list_node) { struct sata_device *sata; if (!dev_is_sata(dev)) continue; sata = &dev->sata_dev; if (sata->ap->pm_mesg.event == PM_EVENT_SUSPEND) continue; ata_sas_port_suspend(sata->ap); } mutex_unlock(&port->ha->disco_mutex); sas_ata_flush_pm_eh(port, __func__); } void sas_resume_sata(struct asd_sas_port *port) { struct domain_device *dev; mutex_lock(&port->ha->disco_mutex); list_for_each_entry(dev, &port->dev_list, dev_list_node) { struct sata_device *sata; if (!dev_is_sata(dev)) continue; sata = &dev->sata_dev; if (sata->ap->pm_mesg.event == PM_EVENT_ON) continue; ata_sas_port_resume(sata->ap); } mutex_unlock(&port->ha->disco_mutex); sas_ata_flush_pm_eh(port, __func__); } /** * sas_discover_sata -- discover an STP/SATA domain device * @dev: pointer to struct domain_device of interest * * Devices directly attached to a HA port, have no parents. All other * devices do, and should have their "parent" pointer set appropriately * before calling this function. */ int sas_discover_sata(struct domain_device *dev) { int res; if (dev->dev_type == SAS_SATA_PM) return -ENODEV; dev->sata_dev.class = sas_get_ata_command_set(dev); sas_fill_in_rphy(dev, dev->rphy); res = sas_notify_lldd_dev_found(dev); if (res) return res; sas_discover_event(dev->port, DISCE_PROBE); return 0; } static void async_sas_ata_eh(void *data, async_cookie_t cookie) { struct domain_device *dev = data; struct ata_port *ap = dev->sata_dev.ap; struct sas_ha_struct *ha = dev->port->ha; sas_ata_printk(KERN_DEBUG, dev, "dev error handler\n"); ata_scsi_port_error_handler(ha->core.shost, ap); sas_put_device(dev); } void sas_ata_strategy_handler(struct Scsi_Host *shost) { struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost); ASYNC_DOMAIN_EXCLUSIVE(async); int i; /* it's ok to defer revalidation events during ata eh, these * disks are in one of three states: * 1/ present for initial domain discovery, and these * resets will cause bcn flutters * 2/ hot removed, we'll discover that after eh fails * 3/ hot added after initial discovery, lost the race, and need * to catch the next train. */ sas_disable_revalidation(sas_ha); spin_lock_irq(&sas_ha->phy_port_lock); for (i = 0; i < sas_ha->num_phys; i++) { struct asd_sas_port *port = sas_ha->sas_port[i]; struct domain_device *dev; spin_lock(&port->dev_list_lock); list_for_each_entry(dev, &port->dev_list, dev_list_node) { if (!dev_is_sata(dev)) continue; /* hold a reference over eh since we may be * racing with final remove once all commands * are completed */ kref_get(&dev->kref); async_schedule_domain(async_sas_ata_eh, dev, &async); } spin_unlock(&port->dev_list_lock); } spin_unlock_irq(&sas_ha->phy_port_lock); async_synchronize_full_domain(&async); sas_enable_revalidation(sas_ha); } void sas_ata_eh(struct Scsi_Host *shost, struct list_head *work_q, struct list_head *done_q) { struct scsi_cmnd *cmd, *n; struct domain_device *eh_dev; do { LIST_HEAD(sata_q); eh_dev = NULL; list_for_each_entry_safe(cmd, n, work_q, eh_entry) { struct domain_device *ddev = cmd_to_domain_dev(cmd); if (!dev_is_sata(ddev) || TO_SAS_TASK(cmd)) continue; if (eh_dev && eh_dev != ddev) continue; eh_dev = ddev; list_move(&cmd->eh_entry, &sata_q); } if (!list_empty(&sata_q)) { struct ata_port *ap = eh_dev->sata_dev.ap; sas_ata_printk(KERN_DEBUG, eh_dev, "cmd error handler\n"); ata_scsi_cmd_error_handler(shost, ap, &sata_q); /* * ata's error handler may leave the cmd on the list * so make sure they don't remain on a stack list * about to go out of scope. * * This looks strange, since the commands are * now part of no list, but the next error * action will be ata_port_error_handler() * which takes no list and sweeps them up * anyway from the ata tag array. */ while (!list_empty(&sata_q)) list_del_init(sata_q.next); } } while (eh_dev); } void sas_ata_schedule_reset(struct domain_device *dev) { struct ata_eh_info *ehi; struct ata_port *ap; unsigned long flags; if (!dev_is_sata(dev)) return; ap = dev->sata_dev.ap; ehi = &ap->link.eh_info; spin_lock_irqsave(ap->lock, flags); ehi->err_mask |= AC_ERR_TIMEOUT; ehi->action |= ATA_EH_RESET; ata_port_schedule_eh(ap); spin_unlock_irqrestore(ap->lock, flags); } EXPORT_SYMBOL_GPL(sas_ata_schedule_reset); void sas_ata_wait_eh(struct domain_device *dev) { struct ata_port *ap; if (!dev_is_sata(dev)) return; ap = dev->sata_dev.ap; ata_port_wait_eh(ap); }