Commit 233f1120 authored by Tejun Heo's avatar Tejun Heo Committed by Jeff Garzik
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libata-acpi: improve dock event handling 



Improve ACPI hotplug handling such that dock event is handled properly.

* Register handlers for dock events.

* Directly detach device on EJECT_REQUEST instead of signaling hotplug
  event.  This prevents libata from accessing severed controller
  and/or device.

* While at it, use named constants for ACPI events and move uevent
  signaling inside host lock.

Original patch and testing by Holger Macht.

Signed-off-by: default avatarTejun Heo <htejun@gmail.com>
Cc: Holger Macht <hmacht@suse.de>
Signed-off-by: default avatarJeff Garzik <jeff@garzik.org>
parent a978b30a

drivers/ata/libata-acpi.c

+69 −27
Original line number Diff line number Diff line
@@ -118,45 +118,77 @@ static void ata_acpi_associate_ide_port(struct ata_port *ap) 
		ap->pflags |= ATA_PFLAG_INIT_GTM_VALID;

}



static void ata_acpi_handle_hotplug(struct ata_port *ap, struct kobject *kobj,

static void ata_acpi_handle_hotplug(struct ata_port *ap, struct ata_device *dev,

				    u32 event)

{

	char event_string[12];

	char *envp[] = { event_string, NULL };

	struct ata_eh_info *ehi = &ap->link.eh_info;



	if (event == 0 || event == 1) {

	struct ata_eh_info *ehi;

	struct kobject *kobj = NULL;

	int wait = 0;

	unsigned long flags;



	if (!ap)

		ap = dev->link->ap;

	ehi = &ap->link.eh_info;



	spin_lock_irqsave(ap->lock, flags);

	       ata_ehi_clear_desc(ehi);



	switch (event) {

	case ACPI_NOTIFY_BUS_CHECK:

	case ACPI_NOTIFY_DEVICE_CHECK:

		ata_ehi_push_desc(ehi, "ACPI event");

		ata_ehi_hotplugged(ehi);

		ata_port_freeze(ap);

	       spin_unlock_irqrestore(ap->lock, flags);

		break;



	case ACPI_NOTIFY_EJECT_REQUEST:

		ata_ehi_push_desc(ehi, "ACPI event");

		if (dev)

			dev->flags |= ATA_DFLAG_DETACH;

		else {

			struct ata_link *tlink;

			struct ata_device *tdev;



			ata_port_for_each_link(tlink, ap)

				ata_link_for_each_dev(tdev, tlink)

					tdev->flags |= ATA_DFLAG_DETACH;

		}



		ata_port_schedule_eh(ap);

		wait = 1;

		break;

	}



	if (dev) {

		if (dev->sdev)

			kobj = &dev->sdev->sdev_gendev.kobj;

	} else

		kobj = &ap->dev->kobj;



	if (kobj) {

		sprintf(event_string, "BAY_EVENT=%d", event);

		kobject_uevent_env(kobj, KOBJ_CHANGE, envp);

	}



	spin_unlock_irqrestore(ap->lock, flags);



	if (wait)

		ata_port_wait_eh(ap);

}



static void ata_acpi_dev_notify(acpi_handle handle, u32 event, void *data)

{

	struct ata_device *dev = data;

	struct kobject *kobj = NULL;



	if (dev->sdev)

		kobj = &dev->sdev->sdev_gendev.kobj;



	ata_acpi_handle_hotplug(dev->link->ap, kobj, event);

	ata_acpi_handle_hotplug(NULL, dev, event);

}



static void ata_acpi_ap_notify(acpi_handle handle, u32 event, void *data)

{

	struct ata_port *ap = data;



	ata_acpi_handle_hotplug(ap, &ap->dev->kobj, event);

	ata_acpi_handle_hotplug(ap, NULL, event);

}



/**
@@ -191,20 +223,30 @@ void ata_acpi_associate(struct ata_host *host) 
		else

			ata_acpi_associate_ide_port(ap);



		if (ap->acpi_handle)

		if (ap->acpi_handle) {

			acpi_install_notify_handler(ap->acpi_handle,

						    ACPI_SYSTEM_NOTIFY,

						     ata_acpi_ap_notify,

						     ap);

						    ata_acpi_ap_notify, ap);

#if defined(CONFIG_ACPI_DOCK) || defined(CONFIG_ACPI_DOCK_MODULE)

			/* we might be on a docking station */

			register_hotplug_dock_device(ap->acpi_handle,

						     ata_acpi_ap_notify, ap);

#endif

		}



		for (j = 0; j < ata_link_max_devices(&ap->link); j++) {

			struct ata_device *dev = &ap->link.device[j];



			if (dev->acpi_handle)

			if (dev->acpi_handle) {

				acpi_install_notify_handler(dev->acpi_handle,

						ACPI_SYSTEM_NOTIFY,

							     ata_acpi_dev_notify,

							     dev);

						ata_acpi_dev_notify, dev);

#if defined(CONFIG_ACPI_DOCK) || defined(CONFIG_ACPI_DOCK_MODULE)

				/* we might be on a docking station */

				register_hotplug_dock_device(dev->acpi_handle,

						ata_acpi_dev_notify, dev);

#endif

			}

		}

	}

}

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