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staging: ozwpan: Use slab cache for oz_tx_frame allocation

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Use a slab cache rather than rolling our own free list.

Signed-off-by: Christoph Jaeger <email@christophjaeger.info>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Christoph Jaeger 2014-08-08 08:01:09 +02:00 committed by Greg Kroah-Hartman
parent 2b8b61aaef
commit 50222db4b0
4 changed files with 16 additions and 37 deletions
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41
drivers/staging/ozwpan/ozpd.c
View file

@ -21,8 +21,6 @@
#include <linux/uaccess.h>
#include <net/psnap.h>
#define OZ_MAX_TX_POOL_SIZE 6
static struct oz_tx_frame *oz_tx_frame_alloc(struct oz_pd *pd);
static void oz_tx_frame_free(struct oz_pd *pd, struct oz_tx_frame *f);
static void oz_tx_isoc_free(struct oz_pd *pd, struct oz_tx_frame *f);
@ -177,13 +175,6 @@ static void oz_pd_free(struct work_struct *work)
e = e->next;
kfree(fwell);
}
/* Deallocate all frames in tx pool.
*/
while (pd->tx_pool) {
e = pd->tx_pool;
pd->tx_pool = e->next;
kfree(container_of(e, struct oz_tx_frame, link));
}
if (pd->net_dev)
dev_put(pd->net_dev);
kfree(pd);
@ -333,17 +324,9 @@ int oz_pd_sleep(struct oz_pd *pd)
*/
static struct oz_tx_frame *oz_tx_frame_alloc(struct oz_pd *pd)
{
struct oz_tx_frame *f = NULL;
struct oz_tx_frame *f;
spin_lock_bh(&pd->tx_frame_lock);
if (pd->tx_pool) {
f = container_of(pd->tx_pool, struct oz_tx_frame, link);
pd->tx_pool = pd->tx_pool->next;
pd->tx_pool_count--;
}
spin_unlock_bh(&pd->tx_frame_lock);
if (f == NULL)
f = kmalloc(sizeof(struct oz_tx_frame), GFP_ATOMIC);
f = kmem_cache_alloc(oz_tx_frame_cache, GFP_ATOMIC);
if (f) {
f->total_size = sizeof(struct oz_hdr);
INIT_LIST_HEAD(&f->link);
@ -359,13 +342,9 @@ static void oz_tx_isoc_free(struct oz_pd *pd, struct oz_tx_frame *f)
{
pd->nb_queued_isoc_frames--;
list_del_init(&f->link);
if (pd->tx_pool_count < OZ_MAX_TX_POOL_SIZE) {
f->link.next = pd->tx_pool;
pd->tx_pool = &f->link;
pd->tx_pool_count++;
} else {
kfree(f);
}
kmem_cache_free(oz_tx_frame_cache, f);
oz_dbg(TX_FRAMES, "Releasing ISOC Frame isoc_nb= %d\n",
pd->nb_queued_isoc_frames);
}
@ -375,15 +354,7 @@ static void oz_tx_isoc_free(struct oz_pd *pd, struct oz_tx_frame *f)
*/
static void oz_tx_frame_free(struct oz_pd *pd, struct oz_tx_frame *f)
{
spin_lock_bh(&pd->tx_frame_lock);
if (pd->tx_pool_count < OZ_MAX_TX_POOL_SIZE) {
f->link.next = pd->tx_pool;
pd->tx_pool = &f->link;
pd->tx_pool_count++;
f = NULL;
}
spin_unlock_bh(&pd->tx_frame_lock);
kfree(f);
kmem_cache_free(oz_tx_frame_cache, f);
}
/*

3
drivers/staging/ozwpan/ozpd.h
View file

@ -90,8 +90,6 @@ struct oz_pd {
unsigned max_stream_buffering;
int nb_queued_frames;
int nb_queued_isoc_frames;
struct list_head *tx_pool;
int tx_pool_count;
spinlock_t tx_frame_lock;
struct list_head *last_sent_frame;
struct list_head tx_queue;
@ -131,5 +129,6 @@ void oz_apps_init(void);
void oz_apps_term(void);
extern struct kmem_cache *oz_elt_info_cache;
extern struct kmem_cache *oz_tx_frame_cache;
#endif /* Sentry */

8
drivers/staging/ozwpan/ozproto.c
View file

@ -53,6 +53,7 @@ static u16 g_apps = 0x1;
static int g_processing_rx;
struct kmem_cache *oz_elt_info_cache;
struct kmem_cache *oz_tx_frame_cache;
/*
* Context: softirq-serialized
@ -483,6 +484,7 @@ void oz_protocol_term(void)
spin_unlock_bh(&g_polling_lock);
oz_dbg(ON, "Protocol stopped\n");
kmem_cache_destroy(oz_tx_frame_cache);
kmem_cache_destroy(oz_elt_info_cache);
}
@ -771,6 +773,12 @@ int oz_protocol_init(char *devs)
if (!oz_elt_info_cache)
return -ENOMEM;
oz_tx_frame_cache = KMEM_CACHE(oz_tx_frame, 0);
if (!oz_tx_frame_cache) {
kmem_cache_destroy(oz_elt_info_cache);
return -ENOMEM;
}
skb_queue_head_init(&g_rx_queue);
if (devs[0] == '*') {
oz_binding_add(NULL);

1
drivers/staging/ozwpan/ozproto.h
View file

@ -66,5 +66,6 @@ int oz_get_pd_status_list(char *pd_list, int max_count);
int oz_get_binding_list(char *buf, int max_if);
extern struct kmem_cache *oz_elt_info_cache;
extern struct kmem_cache *oz_tx_frame_cache;
#endif /* _OZPROTO_H */