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Subject[PATCH 20/25] mac80211_hwsim: Replace hrtimer tasklet with softirq hrtimer
From: Thomas Gleixner <tglx@linutronix.de>

Switch the timer to CLOCK_MONOTONIC_SOFT, which executed the timer
callback in softirq context and remove the hrtimer_tasklet.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Anna-Maria Gleixner <anna-maria@linutronix.de>
Cc: Johannes Berg <johannes@sipsolutions.net>
Cc: Kalle Valo <kvalo@codeaurora.org>
Cc: linux-wireless@vger.kernel.org

---
drivers/net/wireless/mac80211_hwsim.c | 44 +++++++++++++++-------------------
1 file changed, 20 insertions(+), 24 deletions(-)

--- a/drivers/net/wireless/mac80211_hwsim.c
+++ b/drivers/net/wireless/mac80211_hwsim.c
@@ -537,7 +537,7 @@ struct mac80211_hwsim_data {
unsigned int rx_filter;
bool started, idle, scanning;
struct mutex mutex;
- struct tasklet_hrtimer beacon_timer;
+ struct hrtimer beacon_timer;
enum ps_mode {
PS_DISABLED, PS_ENABLED, PS_AUTO_POLL, PS_MANUAL_POLL
} ps;
@@ -1420,7 +1420,7 @@ static void mac80211_hwsim_stop(struct i
{
struct mac80211_hwsim_data *data = hw->priv;
data->started = false;
- tasklet_hrtimer_cancel(&data->beacon_timer);
+ hrtimer_cancel(&data->beacon_timer);
wiphy_debug(hw->wiphy, "%s\n", __func__);
}

@@ -1543,14 +1543,12 @@ static enum hrtimer_restart
mac80211_hwsim_beacon(struct hrtimer *timer)
{
struct mac80211_hwsim_data *data =
- container_of(timer, struct mac80211_hwsim_data,
- beacon_timer.timer);
+ container_of(timer, struct mac80211_hwsim_data, beacon_timer);
struct ieee80211_hw *hw = data->hw;
u64 bcn_int = data->beacon_int;
- ktime_t next_bcn;

if (!data->started)
- goto out;
+ return HRTIMER_NORESTART;

ieee80211_iterate_active_interfaces_atomic(
hw, IEEE80211_IFACE_ITER_NORMAL,
@@ -1562,11 +1560,9 @@ mac80211_hwsim_beacon(struct hrtimer *ti
data->bcn_delta = 0;
}

- next_bcn = ktime_add(hrtimer_get_expires(timer),
- ns_to_ktime(bcn_int * 1000));
- tasklet_hrtimer_start(&data->beacon_timer, next_bcn, HRTIMER_MODE_ABS);
-out:
- return HRTIMER_NORESTART;
+ hrtimer_forward(&data->beacon_timer, hrtimer_get_expires(timer),
+ ns_to_ktime(bcn_int * NSEC_PER_USEC));
+ return HRTIMER_RESTART;
}

static const char * const hwsim_chanwidths[] = {
@@ -1640,15 +1636,15 @@ static int mac80211_hwsim_config(struct
mutex_unlock(&data->mutex);

if (!data->started || !data->beacon_int)
- tasklet_hrtimer_cancel(&data->beacon_timer);
- else if (!hrtimer_is_queued(&data->beacon_timer.timer)) {
+ hrtimer_cancel(&data->beacon_timer);
+ else if (!hrtimer_is_queued(&data->beacon_timer)) {
u64 tsf = mac80211_hwsim_get_tsf(hw, NULL);
u32 bcn_int = data->beacon_int;
u64 until_tbtt = bcn_int - do_div(tsf, bcn_int);

- tasklet_hrtimer_start(&data->beacon_timer,
- ns_to_ktime(until_tbtt * 1000),
- HRTIMER_MODE_REL);
+ hrtimer_start(&data->beacon_timer,
+ ns_to_ktime(until_tbtt * 1000),
+ HRTIMER_MODE_REL);
}

return 0;
@@ -1711,7 +1707,7 @@ static void mac80211_hwsim_bss_info_chan
info->enable_beacon, info->beacon_int);
vp->bcn_en = info->enable_beacon;
if (data->started &&
- !hrtimer_is_queued(&data->beacon_timer.timer) &&
+ !hrtimer_is_queued(&data->beacon_timer) &&
info->enable_beacon) {
u64 tsf, until_tbtt;
u32 bcn_int;
@@ -1719,9 +1715,9 @@ static void mac80211_hwsim_bss_info_chan
tsf = mac80211_hwsim_get_tsf(hw, vif);
bcn_int = data->beacon_int;
until_tbtt = bcn_int - do_div(tsf, bcn_int);
- tasklet_hrtimer_start(&data->beacon_timer,
- ns_to_ktime(until_tbtt * 1000),
- HRTIMER_MODE_REL);
+ hrtimer_start(&data->beacon_timer,
+ ns_to_ktime(until_tbtt * 1000),
+ HRTIMER_MODE_REL);
} else if (!info->enable_beacon) {
unsigned int count = 0;
ieee80211_iterate_active_interfaces_atomic(
@@ -1730,7 +1726,7 @@ static void mac80211_hwsim_bss_info_chan
wiphy_debug(hw->wiphy, " beaconing vifs remaining: %u",
count);
if (count == 0) {
- tasklet_hrtimer_cancel(&data->beacon_timer);
+ hrtimer_cancel(&data->beacon_timer);
data->beacon_int = 0;
}
}
@@ -2722,9 +2718,9 @@ static int mac80211_hwsim_new_radio(stru
data->debugfs,
data, &hwsim_simulate_radar);

- tasklet_hrtimer_init(&data->beacon_timer,
- mac80211_hwsim_beacon,
- CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
+ hrtimer_init(&data->beacon_timer, CLOCK_MONOTONIC_SOFT,
+ HRTIMER_MODE_ABS);
+ data->beacon_timer.function = mac80211_hwsim_beacon;

spin_lock_bh(&hwsim_radio_lock);
list_add_tail(&data->list, &hwsim_radios);

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