This function should be registered for devices that need to execute some
non-driver core/acpi related action in order to be safely removed. If
the removal preparation is successful, the acpi/driver core can continue with
removing the device.
Make acpi_bus_remove call the device-specific prepare_remove callback before
removing the device. If prepare_remove fails, the removal is aborted.
Also introduce acpi_device_prepare_remove which will call the device-specific
prepare_remove callback on driver unbind or device reprobe requests from the
device-driver core.
Signed-off-by: Vasilis Liaskovitis <vasilis.liaskovitis@xxxxxxxxxxxxxxxx>
---
drivers/acpi/scan.c | 21 ++++++++++++++++++++-
include/acpi/acpi_bus.h | 2 ++
2 files changed, 22 insertions(+), 1 deletions(-)
diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index 95ff1e8..725b012 100644
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -582,11 +582,23 @@ static int acpi_device_remove(struct device * dev)
return 0;
}
+static int acpi_device_prepare_remove(struct device *dev)
+{
+ struct acpi_device *acpi_dev = to_acpi_device(dev);
+ struct acpi_driver *acpi_drv = acpi_dev->driver;
+ int ret = 0;
+
+ if (acpi_drv && acpi_drv->ops.prepare_remove)
+ ret = acpi_drv->ops.prepare_remove(acpi_dev);
+ return ret;
+}
+
struct bus_type acpi_bus_type = {
.name = "acpi",
.match = acpi_bus_match,
.probe = acpi_device_probe,
.remove = acpi_device_remove,
+ .prepare_remove = acpi_device_prepare_remove,
.uevent = acpi_device_uevent,
};
@@ -1349,10 +1361,16 @@ static int acpi_device_set_context(struct acpi_device *device)
static int acpi_bus_remove(struct acpi_device *dev, int rmdevice)
{
+ int ret = 0;
if (!dev)
return -EINVAL;
dev->removal_type = ACPI_BUS_REMOVAL_EJECT;
+
+ if (dev->driver && dev->driver->ops.prepare_remove)
+ ret = dev->driver->ops.prepare_remove(dev);
+ if (ret)
+ return ret;
device_release_driver(&dev->dev);
if (!rmdevice)
@@ -1671,7 +1689,8 @@ int acpi_bus_trim(struct acpi_device *start, int rmdevice)
err = acpi_bus_remove(child, rmdevice);
else
err = acpi_bus_remove(child, 1);
-
+ if (err)
+ return err;
continue;
}
diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h
index e04ce7b..1a13c82 100644
--- a/include/acpi/acpi_bus.h
+++ b/include/acpi/acpi_bus.h
@@ -94,6 +94,7 @@ typedef int (*acpi_op_start) (struct acpi_device * device);
typedef int (*acpi_op_bind) (struct acpi_device * device);
typedef int (*acpi_op_unbind) (struct acpi_device * device);
typedef void (*acpi_op_notify) (struct acpi_device * device, u32 event);
+typedef int (*acpi_op_prepare_remove) (struct acpi_device *device);
struct acpi_bus_ops {
u32 acpi_op_add:1;
@@ -107,6 +108,7 @@ struct acpi_device_ops {
acpi_op_bind bind;
acpi_op_unbind unbind;
acpi_op_notify notify;
+ acpi_op_prepare_remove prepare_remove;
};
#define ACPI_DRIVER_ALL_NOTIFY_EVENTS 0x1 /* system AND device events */
--
1.7.9
--
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