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authorStefan Richter <stefanr@s5r6.in-berlin.de>2011-08-27 18:53:03 +0200
committerStefan Richter <stefanr@s5r6.in-berlin.de>2012-01-15 18:37:20 +0100
commit210762268466634ddbfaddb48fdf5181ce4b5f2d (patch)
tree8c07da360066158aa48f450dfeb593ed9ed76d0f /drivers/firewire
parent2ca526bf4953380abfe5dff455e356967b239c70 (diff)
firewire: move fw_device reference counting from drivers to core
fw_unit device drivers invariably need to talk to the fw_unit's parent (an fw_device) and grandparent (an fw_card). firewire-core already maintains an fw_card reference for the entire lifetime of an fw_device. Likewise, let firewire-core maintain an fw_device reference for the entire lifetime of an fw_unit so that fw_unit drivers don't have to. Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Diffstat (limited to 'drivers/firewire')
-rw-r--r--drivers/firewire/core-device.c2
-rw-r--r--drivers/firewire/core.h13
2 files changed, 15 insertions, 0 deletions
diff --git a/drivers/firewire/core-device.c b/drivers/firewire/core-device.c
index f3b890da1e87..4c6c7d8cdaf1 100644
--- a/drivers/firewire/core-device.c
+++ b/drivers/firewire/core-device.c
@@ -641,6 +641,7 @@ static void fw_unit_release(struct device *dev)
{
struct fw_unit *unit = fw_unit(dev);
+ fw_device_put(fw_parent_device(unit));
kfree(unit);
}
@@ -692,6 +693,7 @@ static void create_units(struct fw_device *device)
if (device_register(&unit->device) < 0)
goto skip_unit;
+ fw_device_get(device);
continue;
skip_unit:
diff --git a/drivers/firewire/core.h b/drivers/firewire/core.h
index b45be5767529..b5b34952cf16 100644
--- a/drivers/firewire/core.h
+++ b/drivers/firewire/core.h
@@ -1,6 +1,7 @@
#ifndef _FIREWIRE_CORE_H
#define _FIREWIRE_CORE_H
+#include <linux/device.h>
#include <linux/fs.h>
#include <linux/list.h>
#include <linux/idr.h>
@@ -141,6 +142,18 @@ extern struct rw_semaphore fw_device_rwsem;
extern struct idr fw_device_idr;
extern int fw_cdev_major;
+static inline struct fw_device *fw_device_get(struct fw_device *device)
+{
+ get_device(&device->device);
+
+ return device;
+}
+
+static inline void fw_device_put(struct fw_device *device)
+{
+ put_device(&device->device);
+}
+
struct fw_device *fw_device_get_by_devt(dev_t devt);
int fw_device_set_broadcast_channel(struct device *dev, void *gen);
void fw_node_event(struct fw_card *card, struct fw_node *node, int event);