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staging: brcm80211: use wait queues instead of semaphores in wl_cfg80211.c 

In wl_cfg80211.c two semaphores were used to trigger a task to process
an event. The wait queues are better suited for that purpose. This also
removes checkpatch warning on sema_init() calls in this source file.

Reviewed-by: Roland Vossen <rvossen@broadcom.com>
Reviewed-by: Franky Lin <frankyl@broadcom.com>
Signed-off-by: Arend van Spriel <arend@broadcom.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Arend van Spriel 2011-08-12 15:34:48 +02:00 committed by Greg Kroah-Hartman
parent 05e6468db5
commit 297658defc
2 changed files with 36 additions and 18 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

49
drivers/staging/brcm80211/brcmfmac/wl_cfg80211.c
View File

@ -3162,7 +3162,7 @@ static void brcmf_deinit_priv_mem(struct brcmf_cfg80211_priv *cfg_priv)
static s32 brcmf_create_event_handler(struct brcmf_cfg80211_priv *cfg_priv)
{
sema_init(&cfg_priv->event_sync, 0);
init_waitqueue_head(&cfg_priv->event_waitq);
cfg_priv->event_tsk = kthread_run(brcmf_event_handler, cfg_priv,
"wl_event_handler");
if (IS_ERR(cfg_priv->event_tsk)) {
@ -3224,7 +3224,7 @@ static s32 brcmf_wakeup_iscan(struct brcmf_cfg80211_iscan_ctrl *iscan)
{
if (likely(iscan->state != WL_ISCAN_STATE_IDLE)) {
WL_SCAN("wake up iscan\n");
up(&iscan->sync);
wake_up(&iscan->waitq);
return 0;
}
@ -3330,13 +3330,19 @@ static s32 brcmf_iscan_thread(void *data)
(struct brcmf_cfg80211_iscan_ctrl *)data;
struct brcmf_cfg80211_priv *cfg_priv = iscan_to_cfg(iscan);
struct brcmf_cfg80211_iscan_eloop *el = &iscan->el;
DECLARE_WAITQUEUE(wait, current);
u32 status;
int err = 0;
sched_setscheduler(current, SCHED_FIFO, &param);
allow_signal(SIGTERM);
status = BRCMF_SCAN_RESULTS_PARTIAL;
while (likely(!down_interruptible(&iscan->sync))) {
add_wait_queue(&iscan->waitq, &wait);
while (1) {
prepare_to_wait(&iscan->waitq, &wait, TASK_INTERRUPTIBLE);
schedule();
if (kthread_should_stop())
break;
if (iscan->timer_on) {
@ -3353,6 +3359,7 @@ static s32 brcmf_iscan_thread(void *data)
rtnl_unlock();
el->handler[status](cfg_priv);
}
finish_wait(&iscan->waitq, &wait);
if (iscan->timer_on) {
del_timer_sync(&iscan->timer);
iscan->timer_on = 0;
@ -3380,7 +3387,7 @@ static s32 brcmf_invoke_iscan(struct brcmf_cfg80211_priv *cfg_priv)
if (cfg_priv->iscan_on && !iscan->tsk) {
iscan->state = WL_ISCAN_STATE_IDLE;
sema_init(&iscan->sync, 0);
init_waitqueue_head(&iscan->waitq);
iscan->tsk = kthread_run(brcmf_iscan_thread, iscan, "wl_iscan");
if (IS_ERR(iscan->tsk)) {
WL_ERR("Could not create iscan thread\n");
@ -3528,7 +3535,7 @@ void brcmf_cfg80211_detach(void)
static void brcmf_wakeup_event(struct brcmf_cfg80211_priv *cfg_priv)
{
up(&cfg_priv->event_sync);
wake_up(&cfg_priv->event_waitq);
}
static s32 brcmf_event_handler(void *data)
@ -3537,27 +3544,39 @@ static s32 brcmf_event_handler(void *data)
(struct brcmf_cfg80211_priv *)data;
struct sched_param param = {.sched_priority = MAX_RT_PRIO - 1 };
struct brcmf_cfg80211_event_q *e;
DECLARE_WAITQUEUE(wait, current);
sched_setscheduler(current, SCHED_FIFO, &param);
allow_signal(SIGTERM);
while (likely(!down_interruptible(&cfg_priv->event_sync))) {
add_wait_queue(&cfg_priv->event_waitq, &wait);
while (1) {
prepare_to_wait(&cfg_priv->event_waitq, &wait,
TASK_INTERRUPTIBLE);
schedule();
if (kthread_should_stop())
break;
e = brcmf_deq_event(cfg_priv);
if (unlikely(!e)) {
WL_ERR("event queue empty...\n");
BUG();
continue;
}
WL_INFO("event type (%d)\n", e->etype);
if (cfg_priv->el.handler[e->etype])
cfg_priv->el.handler[e->etype](cfg_priv,
cfg_to_ndev(cfg_priv),
&e->emsg, e->edata);
else
WL_INFO("Unknown Event (%d): ignoring\n", e->etype);
brcmf_put_event(e);
do {
WL_INFO("event type (%d)\n", e->etype);
if (cfg_priv->el.handler[e->etype])
cfg_priv->el.handler[e->etype](cfg_priv,
cfg_to_ndev(cfg_priv),
&e->emsg, e->edata);
else
WL_INFO("Unknown Event (%d): ignoring\n",
e->etype);
brcmf_put_event(e);
} while ((e = brcmf_deq_event(cfg_priv)));
}
finish_wait(&cfg_priv->event_waitq, &wait);
WL_INFO("was terminated\n");
return 0;
}

5
drivers/staging/brcm80211/brcmfmac/wl_cfg80211.h
View File

@ -249,7 +249,7 @@ struct brcmf_cfg80211_iscan_ctrl {
u32 timer_on;
s32 state;
struct task_struct *tsk;
struct semaphore sync;
wait_queue_head_t waitq;
struct brcmf_cfg80211_iscan_eloop el;
void *data;
s8 ioctl_buf[BRCMF_C_IOCTL_SMLEN];
@ -295,13 +295,12 @@ struct brcmf_cfg80211_priv {
cfg80211 layer */
struct brcmf_cfg80211_ie ie; /* information element object for
internal purpose */
struct semaphore event_sync; /* for synchronization of main event
thread */
struct brcmf_cfg80211_profile *profile; /* holding dongle profile */
struct brcmf_cfg80211_iscan_ctrl *iscan; /* iscan controller */
struct brcmf_cfg80211_connect_info conn_info; /* association info */
struct brcmf_cfg80211_pmk_list *pmk_list; /* wpa2 pmk list */
struct task_struct *event_tsk; /* task of main event handler thread */
wait_queue_head_t event_waitq; /* wait queue for main event handling */
unsigned long status; /* current dongle status */
void *pub;
u32 channel; /* current channel */