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authorMatthew Garrett <mjg59@srcf.ucam.org>2008-05-19 17:29:34 +0100
committerJeff Garzik <jgarzik@redhat.com>2008-05-19 17:55:18 -0400
commitae6c23c4e1ec9720b99e1e6850fe47c6c7fddbb3 (patch)
tree645210471902a33b044cdf9f9e06620677b01835 /drivers/ata/libata-acpi.c
parent50af2fa1e18d0ab411d06bf727ecadb7e01721e9 (diff)
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>
Diffstat (limited to 'drivers/ata/libata-acpi.c')
-rw-r--r--drivers/ata/libata-acpi.c77
1 files changed, 50 insertions, 27 deletions
diff --git a/drivers/ata/libata-acpi.c b/drivers/ata/libata-acpi.c
index 70b77e0899a..865a552c91e 100644
--- a/drivers/ata/libata-acpi.c
+++ b/drivers/ata/libata-acpi.c
@@ -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)