From: Jeff Garzik Date: Fri, 23 Jun 2006 03:46:10 +0000 (-0400) Subject: [libata] Add host lock to struct ata_port X-Git-Tag: upstream/snapshot3+hdmi~40144^2~2 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=ba6a13083c1b720a47c05bee7bedbb6ef06c4611;p=platform%2Fadaptation%2Frenesas_rcar%2Frenesas_kernel.git [libata] Add host lock to struct ata_port Prepare for changes required to support SATA devices attached to SAS HBAs. For these devices we don't want to use host_set at all, since libata will not be the owner of struct scsi_host. Signed-off-by: Brian King (with slight merge modifications made by...) Signed-off-by: Jeff Garzik --- diff --git a/drivers/scsi/libata-bmdma.c b/drivers/scsi/libata-bmdma.c index 13fab97..004e1a0 100644 --- a/drivers/scsi/libata-bmdma.c +++ b/drivers/scsi/libata-bmdma.c @@ -715,7 +715,6 @@ void ata_bmdma_drive_eh(struct ata_port *ap, ata_prereset_fn_t prereset, ata_reset_fn_t softreset, ata_reset_fn_t hardreset, ata_postreset_fn_t postreset) { - struct ata_host_set *host_set = ap->host_set; struct ata_eh_context *ehc = &ap->eh_context; struct ata_queued_cmd *qc; unsigned long flags; @@ -726,7 +725,7 @@ void ata_bmdma_drive_eh(struct ata_port *ap, ata_prereset_fn_t prereset, qc = NULL; /* reset PIO HSM and stop DMA engine */ - spin_lock_irqsave(&host_set->lock, flags); + spin_lock_irqsave(ap->lock, flags); ap->hsm_task_state = HSM_ST_IDLE; @@ -755,7 +754,7 @@ void ata_bmdma_drive_eh(struct ata_port *ap, ata_prereset_fn_t prereset, ata_chk_status(ap); ap->ops->irq_clear(ap); - spin_unlock_irqrestore(&host_set->lock, flags); + spin_unlock_irqrestore(ap->lock, flags); if (thaw) ata_eh_thaw_port(ap); diff --git a/drivers/scsi/libata-core.c b/drivers/scsi/libata-core.c index 425ab149..24d340a 100644 --- a/drivers/scsi/libata-core.c +++ b/drivers/scsi/libata-core.c @@ -933,9 +933,9 @@ void ata_port_flush_task(struct ata_port *ap) DPRINTK("ENTER\n"); - spin_lock_irqsave(&ap->host_set->lock, flags); + spin_lock_irqsave(ap->lock, flags); ap->flags |= ATA_FLAG_FLUSH_PORT_TASK; - spin_unlock_irqrestore(&ap->host_set->lock, flags); + spin_unlock_irqrestore(ap->lock, flags); DPRINTK("flush #1\n"); flush_workqueue(ata_wq); @@ -950,9 +950,9 @@ void ata_port_flush_task(struct ata_port *ap) flush_workqueue(ata_wq); } - spin_lock_irqsave(&ap->host_set->lock, flags); + spin_lock_irqsave(ap->lock, flags); ap->flags &= ~ATA_FLAG_FLUSH_PORT_TASK; - spin_unlock_irqrestore(&ap->host_set->lock, flags); + spin_unlock_irqrestore(ap->lock, flags); DPRINTK("EXIT\n"); } @@ -999,11 +999,11 @@ unsigned ata_exec_internal(struct ata_device *dev, unsigned int err_mask; int rc; - spin_lock_irqsave(&ap->host_set->lock, flags); + spin_lock_irqsave(ap->lock, flags); /* no internal command while frozen */ if (ap->flags & ATA_FLAG_FROZEN) { - spin_unlock_irqrestore(&ap->host_set->lock, flags); + spin_unlock_irqrestore(ap->lock, flags); return AC_ERR_SYSTEM; } @@ -1052,14 +1052,14 @@ unsigned ata_exec_internal(struct ata_device *dev, ata_qc_issue(qc); - spin_unlock_irqrestore(&ap->host_set->lock, flags); + spin_unlock_irqrestore(ap->lock, flags); rc = wait_for_completion_timeout(&wait, ATA_TMOUT_INTERNAL); ata_port_flush_task(ap); if (!rc) { - spin_lock_irqsave(&ap->host_set->lock, flags); + spin_lock_irqsave(ap->lock, flags); /* We're racing with irq here. If we lose, the * following test prevents us from completing the qc @@ -1078,7 +1078,7 @@ unsigned ata_exec_internal(struct ata_device *dev, "qc timeout (cmd 0x%x)\n", command); } - spin_unlock_irqrestore(&ap->host_set->lock, flags); + spin_unlock_irqrestore(ap->lock, flags); } /* do post_internal_cmd */ @@ -1092,7 +1092,7 @@ unsigned ata_exec_internal(struct ata_device *dev, } /* finish up */ - spin_lock_irqsave(&ap->host_set->lock, flags); + spin_lock_irqsave(ap->lock, flags); *tf = qc->result_tf; err_mask = qc->err_mask; @@ -1118,7 +1118,7 @@ unsigned ata_exec_internal(struct ata_device *dev, ata_port_probe(ap); } - spin_unlock_irqrestore(&ap->host_set->lock, flags); + spin_unlock_irqrestore(ap->lock, flags); return err_mask; } @@ -3912,7 +3912,7 @@ static void ata_hsm_qc_complete(struct ata_queued_cmd *qc, int in_wq) if (ap->ops->error_handler) { if (in_wq) { - spin_lock_irqsave(&ap->host_set->lock, flags); + spin_lock_irqsave(ap->lock, flags); /* EH might have kicked in while host_set lock * is released. @@ -3926,7 +3926,7 @@ static void ata_hsm_qc_complete(struct ata_queued_cmd *qc, int in_wq) ata_port_freeze(ap); } - spin_unlock_irqrestore(&ap->host_set->lock, flags); + spin_unlock_irqrestore(ap->lock, flags); } else { if (likely(!(qc->err_mask & AC_ERR_HSM))) ata_qc_complete(qc); @@ -3935,10 +3935,10 @@ static void ata_hsm_qc_complete(struct ata_queued_cmd *qc, int in_wq) } } else { if (in_wq) { - spin_lock_irqsave(&ap->host_set->lock, flags); + spin_lock_irqsave(ap->lock, flags); ata_irq_on(ap); ata_qc_complete(qc); - spin_unlock_irqrestore(&ap->host_set->lock, flags); + spin_unlock_irqrestore(ap->lock, flags); } else ata_qc_complete(qc); } @@ -4018,7 +4018,7 @@ fsm_start: * hsm_task_state is changed. Hence, the following locking. */ if (in_wq) - spin_lock_irqsave(&ap->host_set->lock, flags); + spin_lock_irqsave(ap->lock, flags); if (qc->tf.protocol == ATA_PROT_PIO) { /* PIO data out protocol. @@ -4037,7 +4037,7 @@ fsm_start: atapi_send_cdb(ap, qc); if (in_wq) - spin_unlock_irqrestore(&ap->host_set->lock, flags); + spin_unlock_irqrestore(ap->lock, flags); /* if polling, ata_pio_task() handles the rest. * otherwise, interrupt handler takes over from here. @@ -5130,9 +5130,9 @@ void ata_dev_init(struct ata_device *dev) * requests which occur asynchronously. Synchronize using * host_set lock. */ - spin_lock_irqsave(&ap->host_set->lock, flags); + spin_lock_irqsave(ap->lock, flags); dev->flags &= ~ATA_DFLAG_INIT_MASK; - spin_unlock_irqrestore(&ap->host_set->lock, flags); + spin_unlock_irqrestore(ap->lock, flags); memset((void *)dev + ATA_DEVICE_CLEAR_OFFSET, 0, sizeof(*dev) - ATA_DEVICE_CLEAR_OFFSET); @@ -5167,6 +5167,7 @@ static void ata_host_init(struct ata_port *ap, struct Scsi_Host *host, host->unique_id = ata_unique_id++; host->max_cmd_len = 12; + ap->lock = &host_set->lock; ap->flags = ATA_FLAG_DISABLED; ap->id = host->unique_id; ap->host = host; @@ -5388,7 +5389,7 @@ int ata_device_add(const struct ata_probe_ent *ent) ata_port_probe(ap); /* kick EH for boot probing */ - spin_lock_irqsave(&ap->host_set->lock, flags); + spin_lock_irqsave(ap->lock, flags); ap->eh_info.probe_mask = (1 << ATA_MAX_DEVICES) - 1; ap->eh_info.action |= ATA_EH_SOFTRESET; @@ -5396,7 +5397,7 @@ int ata_device_add(const struct ata_probe_ent *ent) ap->flags |= ATA_FLAG_LOADING; ata_port_schedule_eh(ap); - spin_unlock_irqrestore(&ap->host_set->lock, flags); + spin_unlock_irqrestore(ap->lock, flags); /* wait for EH to finish */ ata_port_wait_eh(ap); @@ -5460,29 +5461,29 @@ void ata_port_detach(struct ata_port *ap) return; /* tell EH we're leaving & flush EH */ - spin_lock_irqsave(&ap->host_set->lock, flags); + spin_lock_irqsave(ap->lock, flags); ap->flags |= ATA_FLAG_UNLOADING; - spin_unlock_irqrestore(&ap->host_set->lock, flags); + spin_unlock_irqrestore(ap->lock, flags); ata_port_wait_eh(ap); /* EH is now guaranteed to see UNLOADING, so no new device * will be attached. Disable all existing devices. */ - spin_lock_irqsave(&ap->host_set->lock, flags); + spin_lock_irqsave(ap->lock, flags); for (i = 0; i < ATA_MAX_DEVICES; i++) ata_dev_disable(&ap->device[i]); - spin_unlock_irqrestore(&ap->host_set->lock, flags); + spin_unlock_irqrestore(ap->lock, flags); /* Final freeze & EH. All in-flight commands are aborted. EH * will be skipped and retrials will be terminated with bad * target. */ - spin_lock_irqsave(&ap->host_set->lock, flags); + spin_lock_irqsave(ap->lock, flags); ata_port_freeze(ap); /* won't be thawed */ - spin_unlock_irqrestore(&ap->host_set->lock, flags); + spin_unlock_irqrestore(ap->lock, flags); ata_port_wait_eh(ap); diff --git a/drivers/scsi/libata-eh.c b/drivers/scsi/libata-eh.c index 70b6239..8233859 100644 --- a/drivers/scsi/libata-eh.c +++ b/drivers/scsi/libata-eh.c @@ -128,7 +128,7 @@ enum scsi_eh_timer_return ata_scsi_timed_out(struct scsi_cmnd *cmd) } ret = EH_HANDLED; - spin_lock_irqsave(&ap->host_set->lock, flags); + spin_lock_irqsave(ap->lock, flags); qc = ata_qc_from_tag(ap, ap->active_tag); if (qc) { WARN_ON(qc->scsicmd != cmd); @@ -136,7 +136,7 @@ enum scsi_eh_timer_return ata_scsi_timed_out(struct scsi_cmnd *cmd) qc->err_mask |= AC_ERR_TIMEOUT; ret = EH_NOT_HANDLED; } - spin_unlock_irqrestore(&ap->host_set->lock, flags); + spin_unlock_irqrestore(ap->lock, flags); out: DPRINTK("EXIT, ret=%d\n", ret); @@ -158,7 +158,7 @@ enum scsi_eh_timer_return ata_scsi_timed_out(struct scsi_cmnd *cmd) void ata_scsi_error(struct Scsi_Host *host) { struct ata_port *ap = ata_shost_to_port(host); - spinlock_t *hs_lock = &ap->host_set->lock; + spinlock_t *ap_lock = ap->lock; int i, repeat_cnt = ATA_EH_MAX_REPEAT; unsigned long flags; @@ -185,7 +185,7 @@ void ata_scsi_error(struct Scsi_Host *host) struct scsi_cmnd *scmd, *tmp; int nr_timedout = 0; - spin_lock_irqsave(hs_lock, flags); + spin_lock_irqsave(ap_lock, flags); list_for_each_entry_safe(scmd, tmp, &host->eh_cmd_q, eh_entry) { struct ata_queued_cmd *qc; @@ -224,15 +224,15 @@ void ata_scsi_error(struct Scsi_Host *host) if (nr_timedout) __ata_port_freeze(ap); - spin_unlock_irqrestore(hs_lock, flags); + spin_unlock_irqrestore(ap_lock, flags); } else - spin_unlock_wait(hs_lock); + spin_unlock_wait(ap_lock); repeat: /* invoke error handler */ if (ap->ops->error_handler) { /* fetch & clear EH info */ - spin_lock_irqsave(hs_lock, flags); + spin_lock_irqsave(ap_lock, flags); memset(&ap->eh_context, 0, sizeof(ap->eh_context)); ap->eh_context.i = ap->eh_info; @@ -241,7 +241,7 @@ void ata_scsi_error(struct Scsi_Host *host) ap->flags |= ATA_FLAG_EH_IN_PROGRESS; ap->flags &= ~ATA_FLAG_EH_PENDING; - spin_unlock_irqrestore(hs_lock, flags); + spin_unlock_irqrestore(ap_lock, flags); /* invoke EH. if unloading, just finish failed qcs */ if (!(ap->flags & ATA_FLAG_UNLOADING)) @@ -253,14 +253,14 @@ void ata_scsi_error(struct Scsi_Host *host) * recovered the port but before this point. Repeat * EH in such case. */ - spin_lock_irqsave(hs_lock, flags); + spin_lock_irqsave(ap_lock, flags); if (ap->flags & ATA_FLAG_EH_PENDING) { if (--repeat_cnt) { ata_port_printk(ap, KERN_INFO, "EH pending after completion, " "repeating EH (cnt=%d)\n", repeat_cnt); - spin_unlock_irqrestore(hs_lock, flags); + spin_unlock_irqrestore(ap_lock, flags); goto repeat; } ata_port_printk(ap, KERN_ERR, "EH pending after %d " @@ -270,14 +270,14 @@ void ata_scsi_error(struct Scsi_Host *host) /* this run is complete, make sure EH info is clear */ memset(&ap->eh_info, 0, sizeof(ap->eh_info)); - /* Clear host_eh_scheduled while holding hs_lock such + /* Clear host_eh_scheduled while holding ap_lock such * that if exception occurs after this point but * before EH completion, SCSI midlayer will * re-initiate EH. */ host->host_eh_scheduled = 0; - spin_unlock_irqrestore(hs_lock, flags); + spin_unlock_irqrestore(ap_lock, flags); } else { WARN_ON(ata_qc_from_tag(ap, ap->active_tag) == NULL); ap->ops->eng_timeout(ap); @@ -289,7 +289,7 @@ void ata_scsi_error(struct Scsi_Host *host) scsi_eh_flush_done_q(&ap->eh_done_q); /* clean up */ - spin_lock_irqsave(hs_lock, flags); + spin_lock_irqsave(ap_lock, flags); if (ap->flags & ATA_FLAG_LOADING) { ap->flags &= ~ATA_FLAG_LOADING; @@ -306,7 +306,7 @@ void ata_scsi_error(struct Scsi_Host *host) ap->flags &= ~ATA_FLAG_EH_IN_PROGRESS; wake_up_all(&ap->eh_wait_q); - spin_unlock_irqrestore(hs_lock, flags); + spin_unlock_irqrestore(ap_lock, flags); DPRINTK("EXIT\n"); } @@ -326,17 +326,17 @@ void ata_port_wait_eh(struct ata_port *ap) DEFINE_WAIT(wait); retry: - spin_lock_irqsave(&ap->host_set->lock, flags); + spin_lock_irqsave(ap->lock, flags); while (ap->flags & (ATA_FLAG_EH_PENDING | ATA_FLAG_EH_IN_PROGRESS)) { prepare_to_wait(&ap->eh_wait_q, &wait, TASK_UNINTERRUPTIBLE); - spin_unlock_irqrestore(&ap->host_set->lock, flags); + spin_unlock_irqrestore(ap->lock, flags); schedule(); - spin_lock_irqsave(&ap->host_set->lock, flags); + spin_lock_irqsave(ap->lock, flags); } finish_wait(&ap->eh_wait_q, &wait); - spin_unlock_irqrestore(&ap->host_set->lock, flags); + spin_unlock_irqrestore(ap->lock, flags); /* make sure SCSI EH is complete */ if (scsi_host_in_recovery(ap->host)) { @@ -368,7 +368,6 @@ void ata_port_wait_eh(struct ata_port *ap) static void ata_qc_timeout(struct ata_queued_cmd *qc) { struct ata_port *ap = qc->ap; - struct ata_host_set *host_set = ap->host_set; u8 host_stat = 0, drv_stat; unsigned long flags; @@ -376,7 +375,7 @@ static void ata_qc_timeout(struct ata_queued_cmd *qc) ap->hsm_task_state = HSM_ST_IDLE; - spin_lock_irqsave(&host_set->lock, flags); + spin_lock_irqsave(ap->lock, flags); switch (qc->tf.protocol) { @@ -405,7 +404,7 @@ static void ata_qc_timeout(struct ata_queued_cmd *qc) break; } - spin_unlock_irqrestore(&host_set->lock, flags); + spin_unlock_irqrestore(ap->lock, flags); ata_eh_qc_complete(qc); @@ -592,9 +591,9 @@ void ata_eh_freeze_port(struct ata_port *ap) if (!ap->ops->error_handler) return; - spin_lock_irqsave(&ap->host_set->lock, flags); + spin_lock_irqsave(ap->lock, flags); __ata_port_freeze(ap); - spin_unlock_irqrestore(&ap->host_set->lock, flags); + spin_unlock_irqrestore(ap->lock, flags); } /** @@ -613,14 +612,14 @@ void ata_eh_thaw_port(struct ata_port *ap) if (!ap->ops->error_handler) return; - spin_lock_irqsave(&ap->host_set->lock, flags); + spin_lock_irqsave(ap->lock, flags); ap->flags &= ~ATA_FLAG_FROZEN; if (ap->ops->thaw) ap->ops->thaw(ap); - spin_unlock_irqrestore(&ap->host_set->lock, flags); + spin_unlock_irqrestore(ap->lock, flags); DPRINTK("ata%u port thawed\n", ap->id); } @@ -636,11 +635,11 @@ static void __ata_eh_qc_complete(struct ata_queued_cmd *qc) struct scsi_cmnd *scmd = qc->scsicmd; unsigned long flags; - spin_lock_irqsave(&ap->host_set->lock, flags); + spin_lock_irqsave(ap->lock, flags); qc->scsidone = ata_eh_scsidone; __ata_qc_complete(qc); WARN_ON(ata_tag_valid(qc->tag)); - spin_unlock_irqrestore(&ap->host_set->lock, flags); + spin_unlock_irqrestore(ap->lock, flags); scsi_eh_finish_cmd(scmd, &ap->eh_done_q); } @@ -694,7 +693,7 @@ static void ata_eh_detach_dev(struct ata_device *dev) ata_dev_disable(dev); - spin_lock_irqsave(&ap->host_set->lock, flags); + spin_lock_irqsave(ap->lock, flags); dev->flags &= ~ATA_DFLAG_DETACH; @@ -703,7 +702,7 @@ static void ata_eh_detach_dev(struct ata_device *dev) ap->flags |= ATA_FLAG_SCSI_HOTPLUG; } - spin_unlock_irqrestore(&ap->host_set->lock, flags); + spin_unlock_irqrestore(ap->lock, flags); } static void ata_eh_clear_action(struct ata_device *dev, @@ -749,10 +748,10 @@ static void ata_eh_about_to_do(struct ata_port *ap, struct ata_device *dev, { unsigned long flags; - spin_lock_irqsave(&ap->host_set->lock, flags); + spin_lock_irqsave(ap->lock, flags); ata_eh_clear_action(dev, &ap->eh_info, action); ap->flags |= ATA_FLAG_RECOVERED; - spin_unlock_irqrestore(&ap->host_set->lock, flags); + spin_unlock_irqrestore(ap->lock, flags); } /** @@ -1625,9 +1624,9 @@ static int ata_eh_revalidate_and_attach(struct ata_port *ap, break; } - spin_lock_irqsave(&ap->host_set->lock, flags); + spin_lock_irqsave(ap->lock, flags); ap->flags |= ATA_FLAG_SCSI_HOTPLUG; - spin_unlock_irqrestore(&ap->host_set->lock, flags); + spin_unlock_irqrestore(ap->lock, flags); } } diff --git a/drivers/scsi/libata-scsi.c b/drivers/scsi/libata-scsi.c index 9698949..d86abed 100644 --- a/drivers/scsi/libata-scsi.c +++ b/drivers/scsi/libata-scsi.c @@ -752,7 +752,7 @@ void ata_scsi_slave_destroy(struct scsi_device *sdev) if (!ap->ops->error_handler) return; - spin_lock_irqsave(&ap->host_set->lock, flags); + spin_lock_irqsave(ap->lock, flags); dev = __ata_scsi_find_dev(ap, sdev); if (dev && dev->sdev) { /* SCSI device already in CANCEL state, no need to offline it */ @@ -760,7 +760,7 @@ void ata_scsi_slave_destroy(struct scsi_device *sdev) dev->flags |= ATA_DFLAG_DETACH; ata_port_schedule_eh(ap); } - spin_unlock_irqrestore(&ap->host_set->lock, flags); + spin_unlock_irqrestore(ap->lock, flags); } /** @@ -2684,7 +2684,7 @@ int ata_scsi_queuecmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *)) ap = ata_shost_to_port(shost); spin_unlock(shost->host_lock); - spin_lock(&ap->host_set->lock); + spin_lock(ap->lock); ata_scsi_dump_cdb(ap, cmd); @@ -2696,7 +2696,7 @@ int ata_scsi_queuecmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *)) done(cmd); } - spin_unlock(&ap->host_set->lock); + spin_unlock(ap->lock); spin_lock(shost->host_lock); return rc; } @@ -2858,7 +2858,7 @@ static void ata_scsi_remove_dev(struct ata_device *dev) * increments reference counts regardless of device state. */ mutex_lock(&ap->host->scan_mutex); - spin_lock_irqsave(&ap->host_set->lock, flags); + spin_lock_irqsave(ap->lock, flags); /* clearing dev->sdev is protected by host_set lock */ sdev = dev->sdev; @@ -2882,7 +2882,7 @@ static void ata_scsi_remove_dev(struct ata_device *dev) } } - spin_unlock_irqrestore(&ap->host_set->lock, flags); + spin_unlock_irqrestore(ap->lock, flags); mutex_unlock(&ap->host->scan_mutex); if (sdev) { @@ -2926,9 +2926,9 @@ void ata_scsi_hotplug(void *data) if (!(dev->flags & ATA_DFLAG_DETACHED)) continue; - spin_lock_irqsave(&ap->host_set->lock, flags); + spin_lock_irqsave(ap->lock, flags); dev->flags &= ~ATA_DFLAG_DETACHED; - spin_unlock_irqrestore(&ap->host_set->lock, flags); + spin_unlock_irqrestore(ap->lock, flags); ata_scsi_remove_dev(dev); } @@ -2981,7 +2981,7 @@ static int ata_scsi_user_scan(struct Scsi_Host *shost, unsigned int channel, (lun != SCAN_WILD_CARD && lun != 0)) return -EINVAL; - spin_lock_irqsave(&ap->host_set->lock, flags); + spin_lock_irqsave(ap->lock, flags); if (id == SCAN_WILD_CARD) { ap->eh_info.probe_mask |= (1 << ATA_MAX_DEVICES) - 1; @@ -2999,7 +2999,7 @@ static int ata_scsi_user_scan(struct Scsi_Host *shost, unsigned int channel, if (rc == 0) ata_port_schedule_eh(ap); - spin_unlock_irqrestore(&ap->host_set->lock, flags); + spin_unlock_irqrestore(ap->lock, flags); return rc; } diff --git a/include/linux/libata.h b/include/linux/libata.h index 6b3c3af..20b1cf5 100644 --- a/include/linux/libata.h +++ b/include/linux/libata.h @@ -483,6 +483,7 @@ struct ata_eh_context { struct ata_port { struct Scsi_Host *host; /* our co-allocated scsi host */ const struct ata_port_operations *ops; + spinlock_t *lock; unsigned long flags; /* ATA_FLAG_xxx */ unsigned int id; /* unique id req'd by scsi midlyr */ unsigned int port_no; /* unique port #; from zero */