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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>
This commit is contained in:
Stefan Richter 2011-08-27 18:53:03 +02:00
parent 2ca526bf49
commit 2107622684
5 changed files with 16 additions and 19 deletions
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2
drivers/firewire/core-device.c
View File

@ -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:

13
drivers/firewire/core.h
View File

@ -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);

12
include/linux/firewire.h
View File

@ -203,18 +203,6 @@ 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)
{
get_device(&device->device);
return device;
}
static inline void fw_device_put(struct fw_device *device)
{
put_device(&device->device);
}
int fw_device_enable_phys_dma(struct fw_device *device);
/*

4
sound/firewire/isight.c
View File

@ -612,7 +612,6 @@ static void isight_card_free(struct snd_card *card)
fw_iso_resources_destroy(&isight->resources);
fw_unit_put(isight->unit);
fw_device_put(isight->device);
mutex_destroy(&isight->mutex);
}
@ -645,7 +644,7 @@ static int isight_probe(struct device *unit_dev)
isight->card = card;
mutex_init(&isight->mutex);
isight->unit = fw_unit_get(unit);
isight->device = fw_device_get(fw_dev);
isight->device = fw_dev;
isight->audio_base = get_unit_base(unit);
if (!isight->audio_base) {
dev_err(&unit->device, "audio unit base not found\n");
@ -682,7 +681,6 @@ static int isight_probe(struct device *unit_dev)
err_unit:
fw_unit_put(isight->unit);
fw_device_put(isight->device);
mutex_destroy(&isight->mutex);
error:
snd_card_free(card);

4
sound/firewire/speakers.c
View File

@ -656,12 +656,10 @@ static u32 fwspk_read_firmware_version(struct fw_unit *unit)
static void fwspk_card_free(struct snd_card *card)
{
struct fwspk *fwspk = card->private_data;
struct fw_device *dev = fw_parent_device(fwspk->unit);
amdtp_out_stream_destroy(&fwspk->stream);
cmp_connection_destroy(&fwspk->connection);
fw_unit_put(fwspk->unit);
fw_device_put(dev);
mutex_destroy(&fwspk->mutex);
}
@ -718,7 +716,6 @@ static int __devinit fwspk_probe(struct device *unit_dev)
fwspk = card->private_data;
fwspk->card = card;
mutex_init(&fwspk->mutex);
fw_device_get(fw_dev);
fwspk->unit = fw_unit_get(unit);
fwspk->device_info = fwspk_detect(fw_dev);
if (!fwspk->device_info) {
@ -767,7 +764,6 @@ err_connection:
cmp_connection_destroy(&fwspk->connection);
err_unit:
fw_unit_put(fwspk->unit);
fw_device_put(fw_dev);
mutex_destroy(&fwspk->mutex);
error:
snd_card_free(card);