[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)
{
diff --git a/drivers/base/transport_class.c b/drivers/base/transport_class.c
index 6c2b447..4fb4c5d 100644
--- a/drivers/base/transport_class.c
+++ b/drivers/base/transport_class.c
@@ -64,7 +64,9 @@
}
EXPORT_SYMBOL_GPL(transport_class_unregister);
-static int anon_transport_dummy_function(struct device *dev)
+static int anon_transport_dummy_function(struct transport_container *tc,
+ struct device *dev,
+ struct class_device *cdev)
{
/* do nothing */
return 0;
@@ -115,9 +117,10 @@
struct class_device *classdev)
{
struct transport_class *tclass = class_to_transport_class(cont->class);
+ struct transport_container *tcont = attribute_container_to_transport_container(cont);
if (tclass->setup)
- tclass->setup(dev);
+ tclass->setup(tcont, dev, classdev);
return 0;
}
@@ -178,12 +181,14 @@
EXPORT_SYMBOL_GPL(transport_add_device);
static int transport_configure(struct attribute_container *cont,
- struct device *dev)
+ struct device *dev,
+ struct class_device *cdev)
{
struct transport_class *tclass = class_to_transport_class(cont->class);
+ struct transport_container *tcont = attribute_container_to_transport_container(cont);
if (tclass->configure)
- tclass->configure(dev);
+ tclass->configure(tcont, dev, cdev);
return 0;
}
@@ -202,7 +207,7 @@
*/
void transport_configure_device(struct device *dev)
{
- attribute_container_trigger(dev, transport_configure);
+ attribute_container_device_trigger(dev, transport_configure);
}
EXPORT_SYMBOL_GPL(transport_configure_device);
@@ -215,7 +220,7 @@
struct transport_class *tclass = class_to_transport_class(cont->class);
if (tclass->remove)
- tclass->remove(dev);
+ tclass->remove(tcont, dev, classdev);
if (tclass->remove != anon_transport_dummy_function) {
if (tcont->statistics)
diff --git a/drivers/scsi/scsi_transport_fc.c b/drivers/scsi/scsi_transport_fc.c
index 35d1c1e..96243c7 100644
--- a/drivers/scsi/scsi_transport_fc.c
+++ b/drivers/scsi/scsi_transport_fc.c
@@ -252,7 +252,8 @@
#define to_fc_internal(tmpl) container_of(tmpl, struct fc_internal, t)
-static int fc_target_setup(struct device *dev)
+static int fc_target_setup(struct transport_container *tc, struct device *dev,
+ struct class_device *cdev)
{
struct scsi_target *starget = to_scsi_target(dev);
struct fc_rport *rport = starget_to_rport(starget);
@@ -281,7 +282,8 @@
NULL,
NULL);
-static int fc_host_setup(struct device *dev)
+static int fc_host_setup(struct transport_container *tc, struct device *dev,
+ struct class_device *cdev)
{
struct Scsi_Host *shost = dev_to_shost(dev);
diff --git a/drivers/scsi/scsi_transport_spi.c b/drivers/scsi/scsi_transport_spi.c
index 02134fc..89f6b7f 100644
--- a/drivers/scsi/scsi_transport_spi.c
+++ b/drivers/scsi/scsi_transport_spi.c
@@ -162,7 +162,8 @@
return SPI_SIGNAL_UNKNOWN;
}
-static int spi_host_setup(struct device *dev)
+static int spi_host_setup(struct transport_container *tc, struct device *dev,
+ struct class_device *cdev)
{
struct Scsi_Host *shost = dev_to_shost(dev);
@@ -196,7 +197,9 @@
return &i->t.host_attrs.ac == cont;
}
-static int spi_device_configure(struct device *dev)
+static int spi_device_configure(struct transport_container *tc,
+ struct device *dev,
+ struct class_device *cdev)
{
struct scsi_device *sdev = to_scsi_device(dev);
struct scsi_target *starget = sdev->sdev_target;
@@ -214,7 +217,9 @@
return 0;
}
-static int spi_setup_transport_attrs(struct device *dev)
+static int spi_setup_transport_attrs(struct transport_container *tc,
+ struct device *dev,
+ struct class_device *cdev)
{
struct scsi_target *starget = to_scsi_target(dev);
diff --git a/include/linux/attribute_container.h b/include/linux/attribute_container.h
index af1010b..f54b05b 100644
--- a/include/linux/attribute_container.h
+++ b/include/linux/attribute_container.h
@@ -11,10 +11,12 @@
#include <linux/device.h>
#include <linux/list.h>
+#include <linux/spinlock.h>
struct attribute_container {
struct list_head node;
struct list_head containers;
+ spinlock_t containers_lock;
struct class *class;
struct class_device_attribute **attrs;
int (*match)(struct attribute_container *, struct device *);
@@ -62,12 +64,7 @@
struct class_device *classdev);
void attribute_container_remove_attrs(struct class_device *classdev);
void attribute_container_class_device_del(struct class_device *classdev);
-
-
-
-
-
-
+struct class_device *attribute_container_find_class_device(struct attribute_container *, struct device *);
struct class_device_attribute **attribute_container_classdev_to_attrs(const struct class_device *classdev);
#endif
diff --git a/include/linux/transport_class.h b/include/linux/transport_class.h
index 87d98d1..1d6cc22 100644
--- a/include/linux/transport_class.h
+++ b/include/linux/transport_class.h
@@ -12,11 +12,16 @@
#include <linux/device.h>
#include <linux/attribute_container.h>
+struct transport_container;
+
struct transport_class {
struct class class;
- int (*setup)(struct device *);
- int (*configure)(struct device *);
- int (*remove)(struct device *);
+ int (*setup)(struct transport_container *, struct device *,
+ struct class_device *);
+ int (*configure)(struct transport_container *, struct device *,
+ struct class_device *);
+ int (*remove)(struct transport_container *, struct device *,
+ struct class_device *);
};
#define DECLARE_TRANSPORT_CLASS(cls, nm, su, rm, cfg) \