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Date: Tue, 20 May 2008 09:44:42 +0200
From: Holger Macht <hmacht@...e.de>
To: Matthew Garrett <mjg59@...f.ucam.org>
Cc: Tejun Heo <htejun@...il.com>, linux-ide@...r.kernel.org,
Jeff Garzik <jeff@...zik.org>, linux-acpi@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Fixups to ATA ACPI hotplug
On Mon 19. May - 17:29:34, Matthew Garrett wrote:
> The libata-acpi.c code currently accepts hotplug messages from both the
> port and the device. This does not match the behaviour of the bay
> driver, and may result in confusion when two hotplug requests are
> received for the same device. This patch limits the hotplug notification
> to removable ACPI devices, which in turn allows it to use the _STA
> method to determine whether the device has been removed or inserted.
> On removal, devices are marked as detached. On insertion, a hotplug scan
> is started. This should avoid lockups caused by the ata layer attempting
> to scan devices which have been removed. The uevent sending is moved
> outside the spinlock in order to avoid a warning generated by it firing
> when interrupts are disabled.
Ok, it seems we're currently doing the same work two times. I've also got
a patch for this. Already tested, so please have a look if this would also
match your requirements:
Handle bay devices in dock stations
* Differentiate between bay devices in dock stations and others:
- When an ACPI_NOTIFY_EJECT_REQUEST appears, just signal uevent to
userspace (that is when the optional eject button on a bay device is
pressed/pulled) giving the possibility to unmount file systems and to
clean up. Also, only send uevent in case we get an
ACPI_NOTIFY_EJECT_REQUEST without doing anything else. In other cases,
you'll get an add/remove event because libata attaches/detaches the
device.
- In case of a dock event, which in turn signals an
ACPI_NOTIFY_EJECT_REQUEST, immediately detach the device, because it
may already have been gone
* In case of an ACPI_NOTIFY_DEVICE/BUS_CHECK, evaluate _STA to check if
the device has been plugged or unplugged. If plugged, hotplug it, if
unplugged, just signal event to userspace
(initial patch by Matthew Garrett <mjg59@...f.ucam.org>)
Signed-off-by: Holger Macht <hmacht@...e.de>
---
diff --git a/drivers/ata/libata-acpi.c b/drivers/ata/libata-acpi.c
index 70b77e0..62d94e4 100644
--- a/drivers/ata/libata-acpi.c
+++ b/drivers/ata/libata-acpi.c
@@ -118,77 +118,118 @@ static void ata_acpi_associate_ide_port(struct ata_port *ap)
ap->pflags |= ATA_PFLAG_INIT_GTM_VALID;
}
+static void ata_acpi_detach_device(struct ata_port *ap, struct ata_device *dev)
+{
+ 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_freeze(ap);
+ ata_port_schedule_eh(ap);
+}
+
static void ata_acpi_handle_hotplug(struct ata_port *ap, struct ata_device *dev,
- u32 event)
+ u32 event, int is_dock_event)
{
char event_string[12];
char *envp[] = { event_string, NULL };
struct ata_eh_info *ehi;
struct kobject *kobj = NULL;
int wait = 0;
- unsigned long flags;
+ unsigned long flags, sta;
+ acpi_status status;
+ acpi_handle handle;
if (!ap)
ap = dev->link->ap;
ehi = &ap->link.eh_info;
+ if (dev) {
+ if (dev->sdev)
+ kobj = &dev->sdev->sdev_gendev.kobj;
+ handle = dev->acpi_handle;
+ } else {
+ kobj = &ap->dev->kobj;
+ handle = ap->acpi_handle;
+ }
+
+ if (kobj && !is_dock_event) {
+ sprintf(event_string, "BAY_EVENT=%d", event);
+ kobject_uevent_env(kobj, KOBJ_CHANGE, envp);
+ }
+
spin_lock_irqsave(ap->lock, flags);
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);
- break;
+ status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
+ if (!ACPI_SUCCESS(status)) {
+ printk(KERN_INFO "Unable to evaluate bay status\n");
+ 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;
+ }
+ 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;
- }
+ if (!is_dock_event)
+ break;
- ata_port_schedule_eh(ap);
+ /* undock event - immediate unplug */
+ ata_acpi_detach_device(ap, dev);
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_dock(acpi_handle handle, u32 event, void *data)
+{
+ struct ata_device *dev = data;
+
+ ata_acpi_handle_hotplug(NULL, dev, event, 1);
+}
+
+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);
+}
+
static void ata_acpi_dev_notify(acpi_handle handle, u32 event, void *data)
{
struct ata_device *dev = data;
- ata_acpi_handle_hotplug(NULL, dev, event);
+ ata_acpi_handle_hotplug(NULL, dev, event, 0);
}
static void ata_acpi_ap_notify(acpi_handle handle, u32 event, void *data)
{
struct ata_port *ap = data;
- ata_acpi_handle_hotplug(ap, NULL, event);
+ ata_acpi_handle_hotplug(ap, NULL, event, 0);
}
/**
@@ -229,7 +270,7 @@ void ata_acpi_associate(struct ata_host *host)
ata_acpi_ap_notify, ap);
/* we might be on a docking station */
register_hotplug_dock_device(ap->acpi_handle,
- ata_acpi_ap_notify, ap);
+ ata_acpi_ap_notify_dock, ap);
}
for (j = 0; j < ata_link_max_devices(&ap->link); j++) {
@@ -241,7 +282,7 @@ void ata_acpi_associate(struct ata_host *host)
ata_acpi_dev_notify, dev);
/* we might be on a docking station */
register_hotplug_dock_device(dev->acpi_handle,
- ata_acpi_dev_notify, dev);
+ ata_acpi_dev_notify_dock, dev);
}
}
}
--
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