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path: root/drivers/firewire/fw-device.h
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Diffstat (limited to 'drivers/firewire/fw-device.h')
-rw-r--r--drivers/firewire/fw-device.h38
1 files changed, 28 insertions, 10 deletions
diff --git a/drivers/firewire/fw-device.h b/drivers/firewire/fw-device.h
index 78ecd3991b7..5f131f5129d 100644
--- a/drivers/firewire/fw-device.h
+++ b/drivers/firewire/fw-device.h
@@ -21,6 +21,7 @@
#include <linux/fs.h>
#include <linux/cdev.h>
+#include <linux/rwsem.h>
#include <asm/atomic.h>
enum fw_device_state {
@@ -46,6 +47,11 @@ struct fw_attribute_group {
* fw_device.node_id is guaranteed to be current too.
*
* The same applies to fw_device.card->node_id vs. fw_device.generation.
+ *
+ * fw_device.config_rom and fw_device.config_rom_length may be accessed during
+ * the lifetime of any fw_unit belonging to the fw_device, before device_del()
+ * was called on the last fw_unit. Alternatively, they may be accessed while
+ * holding fw_device_rwsem.
*/
struct fw_device {
atomic_t state;
@@ -53,6 +59,7 @@ struct fw_device {
int node_id;
int generation;
unsigned max_speed;
+ bool cmc;
struct fw_card *card;
struct device device;
struct list_head link;
@@ -64,28 +71,24 @@ struct fw_device {
struct fw_attribute_group attribute_group;
};
-static inline struct fw_device *
-fw_device(struct device *dev)
+static inline struct fw_device *fw_device(struct device *dev)
{
return container_of(dev, struct fw_device, device);
}
-static inline int
-fw_device_is_shutdown(struct fw_device *device)
+static inline int fw_device_is_shutdown(struct fw_device *device)
{
return atomic_read(&device->state) == FW_DEVICE_SHUTDOWN;
}
-static inline struct fw_device *
-fw_device_get(struct fw_device *device)
+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)
+static inline void fw_device_put(struct fw_device *device)
{
put_device(&device->device);
}
@@ -96,20 +99,35 @@ int fw_device_enable_phys_dma(struct fw_device *device);
void fw_device_cdev_update(struct fw_device *device);
void fw_device_cdev_remove(struct fw_device *device);
+extern struct rw_semaphore fw_device_rwsem;
extern int fw_cdev_major;
+/*
+ * fw_unit.directory must not be accessed after device_del(&fw_unit.device).
+ */
struct fw_unit {
struct device device;
u32 *directory;
struct fw_attribute_group attribute_group;
};
-static inline struct fw_unit *
-fw_unit(struct device *dev)
+static inline struct fw_unit *fw_unit(struct device *dev)
{
return container_of(dev, struct fw_unit, device);
}
+static inline struct fw_unit *fw_unit_get(struct fw_unit *unit)
+{
+ get_device(&unit->device);
+
+ return unit;
+}
+
+static inline void fw_unit_put(struct fw_unit *unit)
+{
+ put_device(&unit->device);
+}
+
#define CSR_OFFSET 0x40
#define CSR_LEAF 0x80
#define CSR_DIRECTORY 0xc0