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authorStefan Richter <stefanr@s5r6.in-berlin.de>2008-05-24 16:50:22 +0200
committerStefan Richter <stefanr@s5r6.in-berlin.de>2008-07-14 13:06:03 +0200
commit459f79235d8faa0050180c7e0c7bb4b2b52cbdfd (patch)
tree97847b1b06ded6c136cdba73bc961a46a3e39a30 /drivers/firewire
parent2147ef204f57191e0fff6d5d3d1a0336afa6cfae (diff)
downloadlinux-459f79235d8faa0050180c7e0c7bb4b2b52cbdfd.tar.bz2
firewire: clean up fw_card reference counting
This is a functionally equivalent replacement of the current reference counting of struct fw_card instances. It only converts it to common idioms as suggested by Kristian Høgsberg: - struct kref replaces atomic_t as the counter. - wait_for_completion is used to wait for all card users to complete. BTW, it may make sense to count card->flush_timer and card->work as card users too. Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Diffstat (limited to 'drivers/firewire')
-rw-r--r--drivers/firewire/fw-card.c30
-rw-r--r--drivers/firewire/fw-device.c5
-rw-r--r--drivers/firewire/fw-transaction.h20
3 files changed, 40 insertions, 15 deletions
diff --git a/drivers/firewire/fw-card.c b/drivers/firewire/fw-card.c
index 1332b66ae0b3..da873d795aad 100644
--- a/drivers/firewire/fw-card.c
+++ b/drivers/firewire/fw-card.c
@@ -16,12 +16,15 @@
* Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
-#include <linux/module.h>
-#include <linux/errno.h>
+#include <linux/completion.h>
+#include <linux/crc-itu-t.h>
#include <linux/delay.h>
#include <linux/device.h>
+#include <linux/errno.h>
+#include <linux/kref.h>
+#include <linux/module.h>
#include <linux/mutex.h>
-#include <linux/crc-itu-t.h>
+
#include "fw-transaction.h"
#include "fw-topology.h"
#include "fw-device.h"
@@ -396,7 +399,6 @@ fw_card_initialize(struct fw_card *card, const struct fw_card_driver *driver,
{
static atomic_t index = ATOMIC_INIT(-1);
- atomic_set(&card->device_count, 0);
card->index = atomic_inc_return(&index);
card->driver = driver;
card->device = device;
@@ -405,6 +407,8 @@ fw_card_initialize(struct fw_card *card, const struct fw_card_driver *driver,
card->color = 0;
card->broadcast_channel = BROADCAST_CHANNEL_INITIAL;
+ kref_init(&card->kref);
+ init_completion(&card->done);
INIT_LIST_HEAD(&card->transaction_list);
spin_lock_init(&card->lock);
setup_timer(&card->flush_timer,
@@ -507,6 +511,14 @@ static struct fw_card_driver dummy_driver = {
};
void
+fw_card_release(struct kref *kref)
+{
+ struct fw_card *card = container_of(kref, struct fw_card, kref);
+
+ complete(&card->done);
+}
+
+void
fw_core_remove_card(struct fw_card *card)
{
card->driver->update_phy_reg(card, 4,
@@ -521,12 +533,10 @@ fw_core_remove_card(struct fw_card *card)
card->driver = &dummy_driver;
fw_destroy_nodes(card);
- /*
- * Wait for all device workqueue jobs to finish. Otherwise the
- * firewire-core module could be unloaded before the jobs ran.
- */
- while (atomic_read(&card->device_count) > 0)
- msleep(100);
+
+ /* Wait for all users, especially device workqueue jobs, to finish. */
+ fw_card_put(card);
+ wait_for_completion(&card->done);
cancel_delayed_work_sync(&card->work);
fw_flush_transactions(card);
diff --git a/drivers/firewire/fw-device.c b/drivers/firewire/fw-device.c
index d9c8daf7ae7d..0855fb5568e8 100644
--- a/drivers/firewire/fw-device.c
+++ b/drivers/firewire/fw-device.c
@@ -168,7 +168,7 @@ static void fw_device_release(struct device *dev)
fw_node_put(device->node);
kfree(device->config_rom);
kfree(device);
- atomic_dec(&card->device_count);
+ fw_card_put(card);
}
int fw_device_enable_phys_dma(struct fw_device *device)
@@ -946,8 +946,7 @@ void fw_node_event(struct fw_card *card, struct fw_node *node, int event)
*/
device_initialize(&device->device);
atomic_set(&device->state, FW_DEVICE_INITIALIZING);
- atomic_inc(&card->device_count);
- device->card = card;
+ device->card = fw_card_get(card);
device->node = fw_node_get(node);
device->node_id = node->node_id;
device->generation = card->generation;
diff --git a/drivers/firewire/fw-transaction.h b/drivers/firewire/fw-transaction.h
index 219094e38542..2ae1b0d6cb7b 100644
--- a/drivers/firewire/fw-transaction.h
+++ b/drivers/firewire/fw-transaction.h
@@ -19,14 +19,15 @@
#ifndef __fw_transaction_h
#define __fw_transaction_h
+#include <linux/completion.h>
#include <linux/device.h>
#include <linux/dma-mapping.h>
#include <linux/firewire-constants.h>
+#include <linux/kref.h>
#include <linux/list.h>
#include <linux/spinlock_types.h>
#include <linux/timer.h>
#include <linux/workqueue.h>
-#include <asm/atomic.h>
#define TCODE_IS_READ_REQUEST(tcode) (((tcode) & ~1) == 4)
#define TCODE_IS_BLOCK_PACKET(tcode) (((tcode) & 1) != 0)
@@ -219,7 +220,8 @@ extern struct bus_type fw_bus_type;
struct fw_card {
const struct fw_card_driver *driver;
struct device *device;
- atomic_t device_count;
+ struct kref kref;
+ struct completion done;
int node_id;
int generation;
@@ -260,6 +262,20 @@ struct fw_card {
int bm_generation;
};
+static inline struct fw_card *fw_card_get(struct fw_card *card)
+{
+ kref_get(&card->kref);
+
+ return card;
+}
+
+void fw_card_release(struct kref *kref);
+
+static inline void fw_card_put(struct fw_card *card)
+{
+ kref_put(&card->kref, fw_card_release);
+}
+
/*
* The iso packet format allows for an immediate header/payload part
* stored in 'header' immediately after the packet info plus an