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brcm80211: fmac: fix missing completion events issue

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dpc takes care of all data packets transmissions for sdio function
2. It is possible that it misses some completion events when the
traffic is heavy or it's running on a slow cpu. A linked list is
introduced to make sure dpc is invoked whenever needed.

Reviewed-by: Pieter-Paul Giesberts <pieterpg@broadcom.com>
Reviewed-by: Arend van Spriel <arend@broadcom.com>
Signed-off-by: Franky Lin <frankyl@broadcom.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Franky Lin 2012-04-23 14:24:53 -07:00 committed by John W. Linville
parent 1cc2699057
commit b948a85c1f
1 changed files with 51 additions and 12 deletions
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63
drivers/net/wireless/brcm80211/brcmfmac/dhd_sdio.c
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@ -574,6 +574,8 @@ struct brcmf_sdio {
struct task_struct *dpc_tsk;
struct completion dpc_wait;
struct list_head dpc_tsklst;
spinlock_t dpc_tl_lock;
struct semaphore sdsem;
@ -2594,29 +2596,58 @@ clkwait:
return resched;
}
static inline void brcmf_sdbrcm_adddpctsk(struct brcmf_sdio *bus)
{
struct list_head *new_hd;
unsigned long flags;
if (in_interrupt())
new_hd = kzalloc(sizeof(struct list_head), GFP_ATOMIC);
else
new_hd = kzalloc(sizeof(struct list_head), GFP_KERNEL);
if (new_hd == NULL)
return;
spin_lock_irqsave(&bus->dpc_tl_lock, flags);
list_add_tail(new_hd, &bus->dpc_tsklst);
spin_unlock_irqrestore(&bus->dpc_tl_lock, flags);
}
static int brcmf_sdbrcm_dpc_thread(void *data)
{
struct brcmf_sdio *bus = (struct brcmf_sdio *) data;
struct list_head *cur_hd, *tmp_hd;
unsigned long flags;
allow_signal(SIGTERM);
/* Run until signal received */
while (1) {
if (kthread_should_stop())
break;
if (!wait_for_completion_interruptible(&bus->dpc_wait)) {
/* Call bus dpc unless it indicated down
(then clean stop) */
if (bus->sdiodev->bus_if->state != BRCMF_BUS_DOWN) {
if (brcmf_sdbrcm_dpc(bus))
complete(&bus->dpc_wait);
} else {
if (list_empty(&bus->dpc_tsklst))
if (wait_for_completion_interruptible(&bus->dpc_wait))
break;
spin_lock_irqsave(&bus->dpc_tl_lock, flags);
list_for_each_safe(cur_hd, tmp_hd, &bus->dpc_tsklst) {
spin_unlock_irqrestore(&bus->dpc_tl_lock, flags);
if (bus->sdiodev->bus_if->state == BRCMF_BUS_DOWN) {
/* after stopping the bus, exit thread */
brcmf_sdbrcm_bus_stop(bus->sdiodev->dev);
bus->dpc_tsk = NULL;
break;
}
} else
break;
if (brcmf_sdbrcm_dpc(bus))
brcmf_sdbrcm_adddpctsk(bus);
spin_lock_irqsave(&bus->dpc_tl_lock, flags);
list_del(cur_hd);
kfree(cur_hd);
}
spin_unlock_irqrestore(&bus->dpc_tl_lock, flags);
}
return 0;
}
@ -2669,8 +2700,10 @@ static int brcmf_sdbrcm_bus_txdata(struct device *dev, struct sk_buff *pkt)
/* Schedule DPC if needed to send queued packet(s) */
if (!bus->dpc_sched) {
bus->dpc_sched = true;
if (bus->dpc_tsk)
if (bus->dpc_tsk) {
brcmf_sdbrcm_adddpctsk(bus);
complete(&bus->dpc_wait);
}
}
return ret;
@ -3514,8 +3547,10 @@ void brcmf_sdbrcm_isr(void *arg)
brcmf_dbg(ERROR, "isr w/o interrupt configured!\n");
bus->dpc_sched = true;
if (bus->dpc_tsk)
if (bus->dpc_tsk) {
brcmf_sdbrcm_adddpctsk(bus);
complete(&bus->dpc_wait);
}
}
static bool brcmf_sdbrcm_bus_watchdog(struct brcmf_sdio *bus)
@ -3559,8 +3594,10 @@ static bool brcmf_sdbrcm_bus_watchdog(struct brcmf_sdio *bus)
bus->ipend = true;
bus->dpc_sched = true;
if (bus->dpc_tsk)
if (bus->dpc_tsk) {
brcmf_sdbrcm_adddpctsk(bus);
complete(&bus->dpc_wait);
}
}
}
@ -3897,6 +3934,8 @@ void *brcmf_sdbrcm_probe(u32 regsva, struct brcmf_sdio_dev *sdiodev)
}
/* Initialize DPC thread */
init_completion(&bus->dpc_wait);
INIT_LIST_HEAD(&bus->dpc_tsklst);
spin_lock_init(&bus->dpc_tl_lock);
bus->dpc_tsk = kthread_run(brcmf_sdbrcm_dpc_thread,
bus, "brcmf_dpc");
if (IS_ERR(bus->dpc_tsk)) {