From 210762268466634ddbfaddb48fdf5181ce4b5f2d Mon Sep 17 00:00:00 2001 From: Stefan Richter Date: Sat, 27 Aug 2011 18:53:03 +0200 Subject: [PATCH 1/3] 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 --- drivers/firewire/core-device.c | 2 ++ drivers/firewire/core.h | 13 +++++++++++++ include/linux/firewire.h | 12 ------------ sound/firewire/isight.c | 4 +--- sound/firewire/speakers.c | 4 ---- 5 files changed, 16 insertions(+), 19 deletions(-) diff --git a/drivers/firewire/core-device.c b/drivers/firewire/core-device.c index f3b890d..4c6c7d8 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 b45be57..b5b3495 100644 --- a/drivers/firewire/core.h +++ b/drivers/firewire/core.h @@ -1,6 +1,7 @@ #ifndef _FIREWIRE_CORE_H #define _FIREWIRE_CORE_H +#include #include #include #include @@ -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); diff --git a/include/linux/firewire.h b/include/linux/firewire.h index 84ccf8e..6f1d738 100644 --- a/include/linux/firewire.h +++ b/include/linux/firewire.h @@ -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); /* diff --git a/sound/firewire/isight.c b/sound/firewire/isight.c index 4400308..412b65f 100644 --- a/sound/firewire/isight.c +++ b/sound/firewire/isight.c @@ -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); diff --git a/sound/firewire/speakers.c b/sound/firewire/speakers.c index 3fc257d..18b9b56 100644 --- a/sound/firewire/speakers.c +++ b/sound/firewire/speakers.c @@ -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); -- 1.7.3.4