Merge commit 'v2.6.28-rc2' into tracing/urgent

7 files changed, 144 insertions, 164 deletions

diff --git a/drivers/ata/libata-acpi.c b/drivers/ata/libata-acpi.c
index 9330b7922f6..c012307d0ba 100644
--- a/drivers/ata/libata-acpi.c
+++ b/drivers/ata/libata-acpi.c
@@ -120,21 +120,6 @@ static void ata_acpi_associate_ide_port(struct ata_port *ap)
 		ap->pflags |= ATA_PFLAG_INIT_GTM_VALID;
 }
 
-static void ata_acpi_eject_device(acpi_handle handle)
-{
-	struct acpi_object_list arg_list;
-	union acpi_object arg;
-
-	arg_list.count = 1;
-	arg_list.pointer = &arg;
-	arg.type = ACPI_TYPE_INTEGER;
-	arg.integer.value = 1;
-
-	if (ACPI_FAILURE(acpi_evaluate_object(handle, "_EJ0",
-					      &arg_list, NULL)))
-		printk(KERN_ERR "Failed to evaluate _EJ0!\n");
-}
-
 /* @ap and @dev are the same as ata_acpi_handle_hotplug() */
 static void ata_acpi_detach_device(struct ata_port *ap, struct ata_device *dev)
 {
@@ -157,7 +142,6 @@ static void ata_acpi_detach_device(struct ata_port *ap, struct ata_device *dev)
  * @ap: ATA port ACPI event occurred
  * @dev: ATA device ACPI event occurred (can be NULL)
  * @event: ACPI event which occurred
- * @is_dock_event: boolean indicating whether the event was a dock one
  *
  * All ACPI bay / device realted events end up in this function.  If
  * the event is port-wide @dev is NULL.  If the event is specific to a
@@ -171,117 +155,100 @@ static void ata_acpi_detach_device(struct ata_port *ap, struct ata_device *dev)
  * ACPI notify handler context.  May sleep.
  */
 static void ata_acpi_handle_hotplug(struct ata_port *ap, struct ata_device *dev,
-				    u32 event, int is_dock_event)
+				    u32 event)
 {
-	char event_string[12];
-	char *envp[] = { event_string, NULL };
 	struct ata_eh_info *ehi = &ap->link.eh_info;
-	struct kobject *kobj = NULL;
 	int wait = 0;
 	unsigned long flags;
-	acpi_handle handle, tmphandle;
-	unsigned long sta;
-	acpi_status status;
+	acpi_handle handle;
 
-	if (dev) {
-		if (dev->sdev)
-			kobj = &dev->sdev->sdev_gendev.kobj;
+	if (dev)
 		handle = dev->acpi_handle;
-	} else {
-		kobj = &ap->dev->kobj;
+	else
 		handle = ap->acpi_handle;
-	}
-
-	status = acpi_get_handle(handle, "_EJ0", &tmphandle);
-	if (ACPI_FAILURE(status))
-		/* This device does not support hotplug */
-		return;
-
-	if (event == ACPI_NOTIFY_BUS_CHECK ||
-	    event == ACPI_NOTIFY_DEVICE_CHECK)
-		status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
 
 	spin_lock_irqsave(ap->lock, flags);
-
+	/*
+	 * When dock driver calls into the routine, it will always use
+	 * ACPI_NOTIFY_BUS_CHECK/ACPI_NOTIFY_DEVICE_CHECK for add and
+	 * ACPI_NOTIFY_EJECT_REQUEST for remove
+	 */
 	switch (event) {
 	case ACPI_NOTIFY_BUS_CHECK:
 	case ACPI_NOTIFY_DEVICE_CHECK:
 		ata_ehi_push_desc(ehi, "ACPI event");
 
-		if (ACPI_FAILURE(status)) {
-			ata_port_printk(ap, KERN_ERR,
-				"acpi: failed to determine bay status (0x%x)\n",
-				status);
-			break;
-		}
-
-		if (sta) {
-			ata_ehi_hotplugged(ehi);
-			ata_port_freeze(ap);
-		} else {
-			/* The device has gone - unplug it */
-			ata_acpi_detach_device(ap, dev);
-			wait = 1;
-		}
+		ata_ehi_hotplugged(ehi);
+		ata_port_freeze(ap);
 		break;
 	case ACPI_NOTIFY_EJECT_REQUEST:
 		ata_ehi_push_desc(ehi, "ACPI event");
 
-		if (!is_dock_event)
-			break;
-
-		/* undock event - immediate unplug */
 		ata_acpi_detach_device(ap, dev);
 		wait = 1;
 		break;
 	}
 
-	/* make sure kobj doesn't go away while ap->lock is released */
-	kobject_get(kobj);
-
 	spin_unlock_irqrestore(ap->lock, flags);
 
-	if (wait) {
+	if (wait)
 		ata_port_wait_eh(ap);
-		ata_acpi_eject_device(handle);
-	}
-
-	if (kobj && !is_dock_event) {
-		sprintf(event_string, "BAY_EVENT=%d", event);
-		kobject_uevent_env(kobj, KOBJ_CHANGE, envp);
-	}
-
-	kobject_put(kobj);
 }
 
 static void ata_acpi_dev_notify_dock(acpi_handle handle, u32 event, void *data)
 {
 	struct ata_device *dev = data;
 
-	ata_acpi_handle_hotplug(dev->link->ap, dev, event, 1);
+	ata_acpi_handle_hotplug(dev->link->ap, dev, event);
 }
 
 static void ata_acpi_ap_notify_dock(acpi_handle handle, u32 event, void *data)
 {
 	struct ata_port *ap = data;
 
-	ata_acpi_handle_hotplug(ap, NULL, event, 1);
+	ata_acpi_handle_hotplug(ap, NULL, event);
 }
 
-static void ata_acpi_dev_notify(acpi_handle handle, u32 event, void *data)
+static void ata_acpi_uevent(struct ata_port *ap, struct ata_device *dev,
+	u32 event)
 {
-	struct ata_device *dev = data;
+	struct kobject *kobj = NULL;
+	char event_string[20];
+	char *envp[] = { event_string, NULL };
+
+	if (dev) {
+		if (dev->sdev)
+			kobj = &dev->sdev->sdev_gendev.kobj;
+	} else
+		kobj = &ap->dev->kobj;
 
-	ata_acpi_handle_hotplug(dev->link->ap, dev, event, 0);
+	if (kobj) {
+		snprintf(event_string, 20, "BAY_EVENT=%d", event);
+		kobject_uevent_env(kobj, KOBJ_CHANGE, envp);
+	}
 }
 
-static void ata_acpi_ap_notify(acpi_handle handle, u32 event, void *data)
+static void ata_acpi_ap_uevent(acpi_handle handle, u32 event, void *data)
 {
-	struct ata_port *ap = data;
+	ata_acpi_uevent(data, NULL, event);
+}
 
-	ata_acpi_handle_hotplug(ap, NULL, event, 0);
+static void ata_acpi_dev_uevent(acpi_handle handle, u32 event, void *data)
+{
+	struct ata_device *dev = data;
+	ata_acpi_uevent(dev->link->ap, dev, event);
 }
 
+static struct acpi_dock_ops ata_acpi_dev_dock_ops = {
+	.handler = ata_acpi_dev_notify_dock,
+	.uevent = ata_acpi_dev_uevent,
+};
+
+static struct acpi_dock_ops ata_acpi_ap_dock_ops = {
+	.handler = ata_acpi_ap_notify_dock,
+	.uevent = ata_acpi_ap_uevent,
+};
+
 /**
  * ata_acpi_associate - associate ATA host with ACPI objects
  * @host: target ATA host
@@ -315,24 +282,18 @@ void ata_acpi_associate(struct ata_host *host)
 			ata_acpi_associate_ide_port(ap);
 
 		if (ap->acpi_handle) {
-			acpi_install_notify_handler(ap->acpi_handle,
-						    ACPI_SYSTEM_NOTIFY,
-						    ata_acpi_ap_notify, ap);
 			/* we might be on a docking station */
 			register_hotplug_dock_device(ap->acpi_handle,
-					     ata_acpi_ap_notify_dock, ap);
+					     &ata_acpi_ap_dock_ops, ap);
 		}
 
 		for (j = 0; j < ata_link_max_devices(&ap->link); j++) {
 			struct ata_device *dev = &ap->link.device[j];
 
 			if (dev->acpi_handle) {
-				acpi_install_notify_handler(dev->acpi_handle,
-						ACPI_SYSTEM_NOTIFY,
-						ata_acpi_dev_notify, dev);
 				/* we might be on a docking station */
 				register_hotplug_dock_device(dev->acpi_handle,
-					     ata_acpi_dev_notify_dock, dev);
+					     &ata_acpi_dev_dock_ops, dev);
 			}
 		}
 	}
diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index 1ee9499bd34..8cb0b360bfd 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -1713,8 +1713,6 @@ unsigned ata_exec_internal_sg(struct ata_device *dev,
 	else
 		tag = 0;
 
-	if (test_and_set_bit(tag, &ap->qc_allocated))
-		BUG();
 	qc = __ata_qc_from_tag(ap, tag);
 
 	qc->tag = tag;
@@ -4553,37 +4551,6 @@ void swap_buf_le16(u16 *buf, unsigned int buf_words)
 }
 
 /**
- *	ata_qc_new - Request an available ATA command, for queueing
- *	@ap: Port associated with device @dev
- *	@dev: Device from whom we request an available command structure
- *
- *	LOCKING:
- *	None.
- */
-
-static struct ata_queued_cmd *ata_qc_new(struct ata_port *ap)
-{
-	struct ata_queued_cmd *qc = NULL;
-	unsigned int i;
-
-	/* no command while frozen */
-	if (unlikely(ap->pflags & ATA_PFLAG_FROZEN))
-		return NULL;
-
-	/* the last tag is reserved for internal command. */
-	for (i = 0; i < ATA_MAX_QUEUE - 1; i++)
-		if (!test_and_set_bit(i, &ap->qc_allocated)) {
-			qc = __ata_qc_from_tag(ap, i);
-			break;
-		}
-
-	if (qc)
-		qc->tag = i;
-
-	return qc;
-}
-
-/**
  *	ata_qc_new_init - Request an available ATA command, and initialize it
  *	@dev: Device from whom we request an available command structure
  *
@@ -4591,16 +4558,20 @@ static struct ata_queued_cmd *ata_qc_new(struct ata_port *ap)
  *	None.
  */
 
-struct ata_queued_cmd *ata_qc_new_init(struct ata_device *dev)
+struct ata_queued_cmd *ata_qc_new_init(struct ata_device *dev, int tag)
 {
 	struct ata_port *ap = dev->link->ap;
 	struct ata_queued_cmd *qc;
 
-	qc = ata_qc_new(ap);
+	if (unlikely(ap->pflags & ATA_PFLAG_FROZEN))
+		return NULL;
+
+	qc = __ata_qc_from_tag(ap, tag);
 	if (qc) {
 		qc->scsicmd = NULL;
 		qc->ap = ap;
 		qc->dev = dev;
+		qc->tag = tag;
 
 		ata_qc_reinit(qc);
 	}
@@ -4608,31 +4579,6 @@ struct ata_queued_cmd *ata_qc_new_init(struct ata_device *dev)
 	return qc;
 }
 
-/**
- *	ata_qc_free - free unused ata_queued_cmd
- *	@qc: Command to complete
- *
- *	Designed to free unused ata_queued_cmd object
- *	in case something prevents using it.
- *
- *	LOCKING:
- *	spin_lock_irqsave(host lock)
- */
-void ata_qc_free(struct ata_queued_cmd *qc)
-{
-	struct ata_port *ap = qc->ap;
-	unsigned int tag;
-
-	WARN_ON(qc == NULL);	/* ata_qc_from_tag _might_ return NULL */
-
-	qc->flags = 0;
-	tag = qc->tag;
-	if (likely(ata_tag_valid(tag))) {
-		qc->tag = ATA_TAG_POISON;
-		clear_bit(tag, &ap->qc_allocated);
-	}
-}
-
 void __ata_qc_complete(struct ata_queued_cmd *qc)
 {
 	struct ata_port *ap = qc->ap;
@@ -5373,6 +5319,8 @@ struct ata_port *ata_port_alloc(struct ata_host *host)
 
 #ifdef CONFIG_ATA_SFF
 	INIT_DELAYED_WORK(&ap->port_task, ata_pio_task);
+#else
+	INIT_DELAYED_WORK(&ap->port_task, NULL);
 #endif
 	INIT_DELAYED_WORK(&ap->hotplug_task, ata_scsi_hotplug);
 	INIT_WORK(&ap->scsi_rescan_task, ata_scsi_dev_rescan);
diff --git a/drivers/ata/libata-eh.c b/drivers/ata/libata-eh.c
index a93247cc395..5d687d7cffa 100644
--- a/drivers/ata/libata-eh.c
+++ b/drivers/ata/libata-eh.c
@@ -1206,7 +1206,10 @@ void ata_eh_about_to_do(struct ata_link *link, struct ata_device *dev,
 
 	ata_eh_clear_action(link, dev, ehi, action);
 
-	if (!(ehc->i.flags & ATA_EHI_QUIET))
+	/* About to take EH action, set RECOVERED.  Ignore actions on
+	 * slave links as master will do them again.
+	 */
+	if (!(ehc->i.flags & ATA_EHI_QUIET) && link != ap->slave_link)
 		ap->pflags |= ATA_PFLAG_RECOVERED;
 
 	spin_unlock_irqrestore(ap->lock, flags);
@@ -2010,8 +2013,13 @@ void ata_eh_autopsy(struct ata_port *ap)
 		struct ata_eh_context *mehc = &ap->link.eh_context;
 		struct ata_eh_context *sehc = &ap->slave_link->eh_context;
 
+		/* transfer control flags from master to slave */
+		sehc->i.flags |= mehc->i.flags & ATA_EHI_TO_SLAVE_MASK;
+
+		/* perform autopsy on the slave link */
 		ata_eh_link_autopsy(ap->slave_link);
 
+		/* transfer actions from slave to master and clear slave */
 		ata_eh_about_to_do(ap->slave_link, NULL, ATA_EH_ALL_ACTIONS);
 		mehc->i.action		|= sehc->i.action;
 		mehc->i.dev_action[1]	|= sehc->i.dev_action[1];
@@ -2447,14 +2455,14 @@ int ata_eh_reset(struct ata_link *link, int classify,
 		dev->pio_mode = XFER_PIO_0;
 		dev->flags &= ~ATA_DFLAG_SLEEPING;
 
-		if (ata_phys_link_offline(ata_dev_phys_link(dev)))
-			continue;
-
-		/* apply class override */
-		if (lflags & ATA_LFLAG_ASSUME_ATA)
-			classes[dev->devno] = ATA_DEV_ATA;
-		else if (lflags & ATA_LFLAG_ASSUME_SEMB)
-			classes[dev->devno] = ATA_DEV_SEMB_UNSUP; /* not yet */
+		if (!ata_phys_link_offline(ata_dev_phys_link(dev))) {
+			/* apply class override */
+			if (lflags & ATA_LFLAG_ASSUME_ATA)
+				classes[dev->devno] = ATA_DEV_ATA;
+			else if (lflags & ATA_LFLAG_ASSUME_SEMB)
+				classes[dev->devno] = ATA_DEV_SEMB_UNSUP;
+		} else
+			classes[dev->devno] = ATA_DEV_NONE;
 	}
 
 	/* record current link speed */
diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
index 5d312dc9be9..4b95c4387e9 100644
--- a/drivers/ata/libata-scsi.c
+++ b/drivers/ata/libata-scsi.c
@@ -708,7 +708,11 @@ static struct ata_queued_cmd *ata_scsi_qc_new(struct ata_device *dev,
 {
 	struct ata_queued_cmd *qc;
 
-	qc = ata_qc_new_init(dev);
+	if (cmd->request->tag != -1)
+		qc = ata_qc_new_init(dev, cmd->request->tag);
+	else
+		qc = ata_qc_new_init(dev, 0);
+
 	if (qc) {
 		qc->scsicmd = cmd;
 		qc->scsidone = done;
@@ -1103,7 +1107,8 @@ static int ata_scsi_dev_config(struct scsi_device *sdev,
 
 		depth = min(sdev->host->can_queue, ata_id_queue_depth(dev->id));
 		depth = min(ATA_MAX_QUEUE - 1, depth);
-		scsi_adjust_queue_depth(sdev, MSG_SIMPLE_TAG, depth);
+		scsi_set_tag_type(sdev, MSG_SIMPLE_TAG);
+		scsi_activate_tcq(sdev, depth);
 	}
 
 	return 0;
@@ -1943,6 +1948,11 @@ static unsigned int ata_scsiop_inq_std(struct ata_scsi_args *args, u8 *rbuf)
 		hdr[1] |= (1 << 7);
 
 	memcpy(rbuf, hdr, sizeof(hdr));
+
+	/* if ncq, set tags supported */
+	if (ata_id_has_ncq(args->id))
+		rbuf[7] |= (1 << 1);
+
 	memcpy(&rbuf[8], "ATA     ", 8);
 	ata_id_string(args->id, &rbuf[16], ATA_ID_PROD, 16);
 	ata_id_string(args->id, &rbuf[32], ATA_ID_FW_REV, 4);
diff --git a/drivers/ata/libata-sff.c b/drivers/ata/libata-sff.c
index 2a4c516894f..4b473948632 100644
--- a/drivers/ata/libata-sff.c
+++ b/drivers/ata/libata-sff.c
@@ -2153,8 +2153,17 @@ void ata_sff_error_handler(struct ata_port *ap)
  */
 void ata_sff_post_internal_cmd(struct ata_queued_cmd *qc)
 {
-	if (qc->ap->ioaddr.bmdma_addr)
+	struct ata_port *ap = qc->ap;
+	unsigned long flags;
+
+	spin_lock_irqsave(ap->lock, flags);
+
+	ap->hsm_task_state = HSM_ST_IDLE;
+
+	if (ap->ioaddr.bmdma_addr)
 		ata_bmdma_stop(qc);
+
+	spin_unlock_irqrestore(ap->lock, flags);
 }
 
 /**
diff --git a/drivers/ata/libata.h b/drivers/ata/libata.h
index fe2839e5877..d3831d39bda 100644
--- a/drivers/ata/libata.h
+++ b/drivers/ata/libata.h
@@ -74,7 +74,7 @@ extern struct ata_link *ata_dev_phys_link(struct ata_device *dev);
 extern void ata_force_cbl(struct ata_port *ap);
 extern u64 ata_tf_to_lba(const struct ata_taskfile *tf);
 extern u64 ata_tf_to_lba48(const struct ata_taskfile *tf);
-extern struct ata_queued_cmd *ata_qc_new_init(struct ata_device *dev);
+extern struct ata_queued_cmd *ata_qc_new_init(struct ata_device *dev, int tag);
 extern int ata_build_rw_tf(struct ata_taskfile *tf, struct ata_device *dev,
 			   u64 block, u32 n_block, unsigned int tf_flags,
 			   unsigned int tag);
@@ -103,7 +103,6 @@ extern int ata_dev_configure(struct ata_device *dev);
 extern int sata_down_spd_limit(struct ata_link *link);
 extern int ata_down_xfermask_limit(struct ata_device *dev, unsigned int sel);
 extern void ata_sg_clean(struct ata_queued_cmd *qc);
-extern void ata_qc_free(struct ata_queued_cmd *qc);
 extern void ata_qc_issue(struct ata_queued_cmd *qc);
 extern void __ata_qc_complete(struct ata_queued_cmd *qc);
 extern int atapi_check_dma(struct ata_queued_cmd *qc);
@@ -119,6 +118,22 @@ extern struct ata_port *ata_port_alloc(struct ata_host *host);
 extern void ata_dev_enable_pm(struct ata_device *dev, enum link_pm policy);
 extern void ata_lpm_schedule(struct ata_port *ap, enum link_pm);
 
+/**
+ *	ata_qc_free - free unused ata_queued_cmd
+ *	@qc: Command to complete
+ *
+ *	Designed to free unused ata_queued_cmd object
+ *	in case something prevents using it.
+ *
+ *	LOCKING:
+ *	spin_lock_irqsave(host lock)
+ */
+static inline void ata_qc_free(struct ata_queued_cmd *qc)
+{
+	qc->flags = 0;
+	qc->tag = ATA_TAG_POISON;
+}
+
 /* libata-acpi.c */
 #ifdef CONFIG_ATA_ACPI
 extern void ata_acpi_associate_sata_port(struct ata_port *ap);
diff --git a/drivers/ata/sata_via.c b/drivers/ata/sata_via.c
index 1cfa74535d9..5b72e734300 100644
--- a/drivers/ata/sata_via.c
+++ b/drivers/ata/sata_via.c
@@ -70,6 +70,7 @@ enum {
 static int svia_init_one(struct pci_dev *pdev, const struct pci_device_id *ent);
 static int svia_scr_read(struct ata_link *link, unsigned int sc_reg, u32 *val);
 static int svia_scr_write(struct ata_link *link, unsigned int sc_reg, u32 val);
+static void svia_tf_load(struct ata_port *ap, const struct ata_taskfile *tf);
 static void svia_noop_freeze(struct ata_port *ap);
 static int vt6420_prereset(struct ata_link *link, unsigned long deadline);
 static int vt6421_pata_cable_detect(struct ata_port *ap);
@@ -103,21 +104,26 @@ static struct scsi_host_template svia_sht = {
 	ATA_BMDMA_SHT(DRV_NAME),
 };
 
-static struct ata_port_operations vt6420_sata_ops = {
+static struct ata_port_operations svia_base_ops = {
 	.inherits		= &ata_bmdma_port_ops,
+	.sff_tf_load		= svia_tf_load,
+};
+
+static struct ata_port_operations vt6420_sata_ops = {
+	.inherits		= &svia_base_ops,
 	.freeze			= svia_noop_freeze,
 	.prereset		= vt6420_prereset,
 };
 
 static struct ata_port_operations vt6421_pata_ops = {
-	.inherits		= &ata_bmdma_port_ops,
+	.inherits		= &svia_base_ops,
 	.cable_detect		= vt6421_pata_cable_detect,
 	.set_piomode		= vt6421_set_pio_mode,
 	.set_dmamode		= vt6421_set_dma_mode,
 };
 
 static struct ata_port_operations vt6421_sata_ops = {
-	.inherits		= &ata_bmdma_port_ops,
+	.inherits		= &svia_base_ops,
 	.scr_read		= svia_scr_read,
 	.scr_write		= svia_scr_write,
 };
@@ -168,6 +174,29 @@ static int svia_scr_write(struct ata_link *link, unsigned int sc_reg, u32 val)
 	return 0;
 }
 
+/**
+ *	svia_tf_load - send taskfile registers to host controller
+ *	@ap: Port to which output is sent
+ *	@tf: ATA taskfile register set
+ *
+ *	Outputs ATA taskfile to standard ATA host controller.
+ *
+ *	This is to fix the internal bug of via chipsets, which will
+ *	reset the device register after changing the IEN bit on ctl
+ *	register.
+ */
+static void svia_tf_load(struct ata_port *ap, const struct ata_taskfile *tf)
+{
+	struct ata_taskfile ttf;
+
+	if (tf->ctl != ap->last_ctl)  {
+		ttf = *tf;
+		ttf.flags |= ATA_TFLAG_DEVICE;
+		tf = &ttf;
+	}
+	ata_sff_tf_load(ap, tf);
+}
+
 static void svia_noop_freeze(struct ata_port *ap)
 {
 	/* Some VIA controllers choke if ATA_NIEN is manipulated in