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Fixups to ATA ACPI hotplug 

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.

Signed-off-by: Matthew Garrett <mjg@redhat.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
This commit is contained in:
Matthew Garrett 2008-05-19 17:29:34 +01:00 committed by Jeff Garzik
parent 50af2fa1e1
commit ae6c23c4e1
1 changed files with 50 additions and 27 deletions
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77
drivers/ata/libata-acpi.c
View File

@ -118,8 +118,8 @@ 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 ata_device *dev,
u32 event)
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 };
@ -127,39 +127,67 @@ static void ata_acpi_handle_hotplug(struct ata_port *ap, struct ata_device *dev,
struct kobject *kobj = NULL;
int wait = 0;
unsigned long flags;
acpi_handle handle, tmphandle;
unsigned long sta;
acpi_status status;
if (!ap)
ap = dev->link->ap;
ehi = &ap->link.eh_info;
spin_lock_irqsave(ap->lock, flags);
if (dev)
handle = dev->acpi_handle;
else
handle = ap->acpi_handle;
status = acpi_get_handle(handle, "_EJ0", &tmphandle);
if (ACPI_FAILURE(status)) {
/* This device is not ejectable */
spin_unlock_irqrestore(ap->lock, flags);
return;
}
status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
if (ACPI_FAILURE(status)) {
printk ("Unable to determine bay status\n");
spin_unlock_irqrestore(ap->lock, flags);
return;
}
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;
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 (!sta) {
/* Device has been unplugged */
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;
} else {
ata_ehi_hotplugged(ehi);
ata_port_freeze(ap);
}
ata_port_schedule_eh(ap);
wait = 1;
break;
}
spin_unlock_irqrestore(ap->lock, flags);
if (wait)
ata_port_wait_eh(ap);
if (dev) {
if (dev->sdev)
kobj = &dev->sdev->sdev_gendev.kobj;
@ -170,11 +198,6 @@ static void ata_acpi_handle_hotplug(struct ata_port *ap, struct ata_device *dev,
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)