From: Arend van Spriel <arend@xxxxxxxxxxxx>
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.
Signed-off-by: Arend van Spriel <arend@xxxxxxxxxxxx>
Reviewed-by: Roland Vossen <rvossen@xxxxxxxxxxxx>
Reviewed-by: Franky Lin <frankyl@xxxxxxxxxxxx>
---
drivers/staging/brcm80211/brcmfmac/wl_cfg80211.c | 28 +++++++++++++++++----
drivers/staging/brcm80211/brcmfmac/wl_cfg80211.h | 5 +--
2 files changed, 24 insertions(+), 9 deletions(-)
diff --git a/drivers/staging/brcm80211/brcmfmac/wl_cfg80211.c b/drivers/staging/brcm80211/brcmfmac/wl_cfg80211.c
index 440ae6d..1199397 100644
--- a/drivers/staging/brcm80211/brcmfmac/wl_cfg80211.c
+++ b/drivers/staging/brcm80211/brcmfmac/wl_cfg80211.c
@@ -3165,7 +3165,7 @@ 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)) {
@@ -3227,7 +3227,7 @@ 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;
}
@@ -3333,13 +3333,19 @@ 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, ¶m);
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) {
@@ -3356,6 +3362,7 @@ 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;
@@ -3383,7 +3390,7 @@ 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");
@@ -3531,7 +3538,7 @@ 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)
@@ -3540,12 +3547,20 @@ 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, ¶m);
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");
@@ -3561,6 +3576,7 @@ static s32 brcmf_event_handler(void *data)
brcmf_put_event(e);
}
+ finish_wait(&cfg_priv->event_waitq, &wait);
WL_INFO("was terminated\n");
return 0;
}
diff --git a/drivers/staging/brcm80211/brcmfmac/wl_cfg80211.h b/drivers/staging/brcm80211/brcmfmac/wl_cfg80211.h
index 48f10d0..e25c755 100644
--- a/drivers/staging/brcm80211/brcmfmac/wl_cfg80211.h
+++ b/drivers/staging/brcm80211/brcmfmac/wl_cfg80211.h
@@ -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 */
--
1.7.1
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