[SCSI] correct transport class abstraction to work outside SCSI
I recently tried to construct a totally generic transport class and
found there were certain features missing from the current abstract
transport class. Most notable is that you have to hang the data on the
class_device but most of the API is framed in terms of the generic
device, not the class_device.
These changes are two fold
- Provide the class_device to all of the setup and configure APIs
- Provide and extra API to take the device and the attribute class and
return the corresponding class_device
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
diff --git a/drivers/base/attribute_container.c b/drivers/base/attribute_container.c
index ec615d8..62c093d 100644
--- a/drivers/base/attribute_container.c
+++ b/drivers/base/attribute_container.c
@@ -58,6 +58,7 @@
{
INIT_LIST_HEAD(&cont->node);
INIT_LIST_HEAD(&cont->containers);
+ spin_lock_init(&cont->containers_lock);
down(&attribute_container_mutex);
list_add_tail(&cont->node, &attribute_container_list);
@@ -77,11 +78,13 @@
{
int retval = -EBUSY;
down(&attribute_container_mutex);
+ spin_lock(&cont->containers_lock);
if (!list_empty(&cont->containers))
goto out;
retval = 0;
list_del(&cont->node);
out:
+ spin_unlock(&cont->containers_lock);
up(&attribute_container_mutex);
return retval;
@@ -151,7 +154,9 @@
fn(cont, dev, &ic->classdev);
else
attribute_container_add_class_device(&ic->classdev);
+ spin_lock(&cont->containers_lock);
list_add_tail(&ic->node, &cont->containers);
+ spin_unlock(&cont->containers_lock);
}
up(&attribute_container_mutex);
}
@@ -189,6 +194,7 @@
if (!cont->match(cont, dev))
continue;
+ spin_lock(&cont->containers_lock);
list_for_each_entry_safe(ic, tmp, &cont->containers, node) {
if (dev != ic->classdev.dev)
continue;
@@ -200,6 +206,7 @@
class_device_unregister(&ic->classdev);
}
}
+ spin_unlock(&cont->containers_lock);
}
up(&attribute_container_mutex);
}
@@ -230,10 +237,12 @@
if (!cont->match(cont, dev))
continue;
+ spin_lock(&cont->containers_lock);
list_for_each_entry_safe(ic, tmp, &cont->containers, node) {
if (dev == ic->classdev.dev)
fn(cont, dev, &ic->classdev);
}
+ spin_unlock(&cont->containers_lock);
}
up(&attribute_container_mutex);
}
@@ -368,6 +377,35 @@
}
EXPORT_SYMBOL_GPL(attribute_container_class_device_del);
+/**
+ * attribute_container_find_class_device - find the corresponding class_device
+ *
+ * @cont: the container
+ * @dev: the generic device
+ *
+ * Looks up the device in the container's list of class devices and returns
+ * the corresponding class_device.
+ */
+struct class_device *
+attribute_container_find_class_device(struct attribute_container *cont,
+ struct device *dev)
+{
+ struct class_device *cdev = NULL;
+ struct internal_container *ic;
+
+ spin_lock(&cont->containers_lock);
+ list_for_each_entry(ic, &cont->containers, node) {
+ if (ic->classdev.dev == dev) {
+ cdev = &ic->classdev;
+ break;
+ }
+ }
+ spin_unlock(&cont->containers_lock);
+
+ return cdev;
+}
+EXPORT_SYMBOL_GPL(attribute_container_find_class_device);
+
int __init
attribute_container_init(void)
{