[PATCH 1/4] cfg80211: track time using boottime

[PATCH 1/4] cfg80211: track time using boottime

[Arnd Bergmann]

The cfg80211 layer uses get_seconds() to read the current time
in its supend handling. This function is deprecated because of the 32-bit
time_t overflow, and it can cause unexpected behavior when the time
changes due to settimeofday() calls or leap second updates.

In many cases, we want to use monotonic time instead, however cfg80211
explicitly tracks the time spent in suspend, so this changes the
driver over to use ktime_get_boottime_seconds(), which is slightly
slower, but not used in a fastpath here.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 net/wireless/core.h  | 2 +-
 net/wireless/sysfs.c | 4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/net/wireless/core.h b/net/wireless/core.h
index 63eb1b5fdd04..7f52ef569320 100644
--- a/net/wireless/core.h
+++ b/net/wireless/core.h
@@ -76,7 +76,7 @@ struct cfg80211_registered_device {
 	struct cfg80211_scan_request *scan_req; /* protected by RTNL */
 	struct sk_buff *scan_msg;
 	struct list_head sched_scan_req_list;
-	unsigned long suspend_at;
+	time64_t suspend_at;
 	struct work_struct scan_done_wk;
 
 	struct genl_info *cur_cmd_info;
diff --git a/net/wireless/sysfs.c b/net/wireless/sysfs.c
index 570a2b67ca10..6ab32f6a1961 100644
--- a/net/wireless/sysfs.c
+++ b/net/wireless/sysfs.c
@@ -102,7 +102,7 @@ static int wiphy_suspend(struct device *dev)
 	struct cfg80211_registered_device *rdev = dev_to_rdev(dev);
 	int ret = 0;
 
-	rdev->suspend_at = get_seconds();
+	rdev->suspend_at = ktime_get_boottime_seconds();
 
 	rtnl_lock();
 	if (rdev->wiphy.registered) {
@@ -130,7 +130,7 @@ static int wiphy_resume(struct device *dev)
 	int ret = 0;
 
 	/* Age scan results with time spent in suspend */
-	cfg80211_bss_age(rdev, get_seconds() - rdev->suspend_at);
+	cfg80211_bss_age(rdev, ktime_get_boottime_seconds() - rdev->suspend_at);
 
 	rtnl_lock();
 	if (rdev->wiphy.registered && rdev->ops->resume)
-- 
2.9.0

[PATCH 2/4] zd1211rw: stop using deprecated get_seconds()

[Arnd Bergmann]

The get_seconds() function is deprecated because of the y2038 overflow.
In zd1211rw we don't even care about the absolute value, so this is
not a problem, but it's equally trivial to change to the non-deprecated
ktime_get_seconds().

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 drivers/net/wireless/zydas/zd1211rw/zd_chip.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/wireless/zydas/zd1211rw/zd_chip.c b/drivers/net/wireless/zydas/zd1211rw/zd_chip.c
index 07b94eda9604..dd6a86b899eb 100644
--- a/drivers/net/wireless/zydas/zd1211rw/zd_chip.c
+++ b/drivers/net/wireless/zydas/zd1211rw/zd_chip.c
@@ -1341,7 +1341,7 @@ int zd_chip_control_leds(struct zd_chip *chip, enum led_status status)
 	case ZD_LED_SCANNING:
 		ioreqs[0].value = FW_LINK_OFF;
 		ioreqs[1].value = v[1] & ~other_led;
-		if (get_seconds() % 3 == 0) {
+		if ((u32)ktime_get_seconds() % 3 == 0) {
 			ioreqs[1].value &= ~chip->link_led;
 		} else {
 			ioreqs[1].value |= chip->link_led;
-- 
2.9.0

Re: [2/4] zd1211rw: stop using deprecated get_seconds()

[Kalle Valo]

Arnd Bergmann <arnd@arndb.de> wrote:

> The get_seconds() function is deprecated because of the y2038 overflow.
> In zd1211rw we don't even care about the absolute value, so this is
> not a problem, but it's equally trivial to change to the non-deprecated
> ktime_get_seconds().
> 
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>

2 patches applied to wireless-drivers-next.git, thanks.

71e140b57151 zd1211rw: stop using deprecated get_seconds()
3cade2f3d98a ipw2x00: track time using boottime

-- 
https://patchwork.kernel.org/patch/10471961/

https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches

[PATCH 3/4] ipw2x00: track time using boottime

[Arnd Bergmann]

The ipw2x00 driver family uses get_seconds() to read the current time
for various purposes. This function is deprecated because of the 32-bit
time_t overflow, and it can cause unexpected behavior when the time
changes due to settimeofday() calls or leap second updates.

In many cases, we want to use monotonic time instead, however ipw2x00
explicitly tracks the time spent in suspend, so this changes the
driver over to use ktime_get_boottime_seconds(), which is slightly
slower, but not used in a fastpath here.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 drivers/net/wireless/intel/ipw2x00/ipw2100.c | 18 +++++++++---------
 drivers/net/wireless/intel/ipw2x00/ipw2100.h | 12 ++++++------
 drivers/net/wireless/intel/ipw2x00/ipw2200.c |  4 ++--
 drivers/net/wireless/intel/ipw2x00/ipw2200.h |  6 +++---
 4 files changed, 20 insertions(+), 20 deletions(-)

diff --git a/drivers/net/wireless/intel/ipw2x00/ipw2100.c b/drivers/net/wireless/intel/ipw2x00/ipw2100.c
index b8fd3cc90634..1ad83ef5f202 100644
--- a/drivers/net/wireless/intel/ipw2x00/ipw2100.c
+++ b/drivers/net/wireless/intel/ipw2x00/ipw2100.c
@@ -692,7 +692,7 @@ static void printk_buf(int level, const u8 * data, u32 len)
 
 static void schedule_reset(struct ipw2100_priv *priv)
 {
-	unsigned long now = get_seconds();
+	time64_t now = ktime_get_boottime_seconds();
 
 	/* If we haven't received a reset request within the backoff period,
 	 * then we can reset the backoff interval so this reset occurs
@@ -701,10 +701,10 @@ static void schedule_reset(struct ipw2100_priv *priv)
 	    (now - priv->last_reset > priv->reset_backoff))
 		priv->reset_backoff = 0;
 
-	priv->last_reset = get_seconds();
+	priv->last_reset = now;
 
 	if (!(priv->status & STATUS_RESET_PENDING)) {
-		IPW_DEBUG_INFO("%s: Scheduling firmware restart (%ds).\n",
+		IPW_DEBUG_INFO("%s: Scheduling firmware restart (%llds).\n",
 			       priv->net_dev->name, priv->reset_backoff);
 		netif_carrier_off(priv->net_dev);
 		netif_stop_queue(priv->net_dev);
@@ -2079,7 +2079,7 @@ static void isr_indicate_associated(struct ipw2100_priv *priv, u32 status)
 	memcpy(priv->bssid, bssid, ETH_ALEN);
 
 	priv->status |= STATUS_ASSOCIATING;
-	priv->connect_start = get_seconds();
+	priv->connect_start = ktime_get_boottime_seconds();
 
 	schedule_delayed_work(&priv->wx_event_work, HZ / 10);
 }
@@ -4070,8 +4070,8 @@ static ssize_t show_internals(struct device *d, struct device_attribute *attr,
 #define DUMP_VAR(x,y) len += sprintf(buf + len, # x ": %" y "\n", priv-> x)
 
 	if (priv->status & STATUS_ASSOCIATED)
-		len += sprintf(buf + len, "connected: %lu\n",
-			       get_seconds() - priv->connect_start);
+		len += sprintf(buf + len, "connected: %llu\n",
+			       ktime_get_boottime_seconds() - priv->connect_start);
 	else
 		len += sprintf(buf + len, "not connected\n");
 
@@ -4108,7 +4108,7 @@ static ssize_t show_internals(struct device *d, struct device_attribute *attr,
 	DUMP_VAR(txq_stat.lo, "d");
 
 	DUMP_VAR(ieee->scans, "d");
-	DUMP_VAR(reset_backoff, "d");
+	DUMP_VAR(reset_backoff, "lld");
 
 	return len;
 }
@@ -6437,7 +6437,7 @@ static int ipw2100_suspend(struct pci_dev *pci_dev, pm_message_t state)
 	pci_disable_device(pci_dev);
 	pci_set_power_state(pci_dev, PCI_D3hot);
 
-	priv->suspend_at = get_seconds();
+	priv->suspend_at = ktime_get_boottime_seconds();
 
 	mutex_unlock(&priv->action_mutex);
 
@@ -6482,7 +6482,7 @@ static int ipw2100_resume(struct pci_dev *pci_dev)
 	 * the queue of needed */
 	netif_device_attach(dev);
 
-	priv->suspend_time = get_seconds() - priv->suspend_at;
+	priv->suspend_time = ktime_get_boottime_seconds() - priv->suspend_at;
 
 	/* Bring the device back up */
 	if (!(priv->status & STATUS_RF_KILL_SW))
diff --git a/drivers/net/wireless/intel/ipw2x00/ipw2100.h b/drivers/net/wireless/intel/ipw2x00/ipw2100.h
index ce3e35f6b60f..8c11c7fa2eef 100644
--- a/drivers/net/wireless/intel/ipw2x00/ipw2100.h
+++ b/drivers/net/wireless/intel/ipw2x00/ipw2100.h
@@ -491,7 +491,7 @@ struct ipw2100_priv {
 
 	/* Statistics */
 	int resets;
-	int reset_backoff;
+	time64_t reset_backoff;
 
 	/* Context */
 	u8 essid[IW_ESSID_MAX_SIZE];
@@ -500,8 +500,8 @@ struct ipw2100_priv {
 	u8 channel;
 	int last_mode;
 
-	unsigned long connect_start;
-	unsigned long last_reset;
+	time64_t connect_start;
+	time64_t last_reset;
 
 	u32 channel_mask;
 	u32 fatal_error;
@@ -581,9 +581,9 @@ struct ipw2100_priv {
 
 	int user_requested_scan;
 
-	/* Track time in suspend */
-	unsigned long suspend_at;
-	unsigned long suspend_time;
+	/* Track time in suspend, using CLOCK_BOOTTIME */
+	time64_t suspend_at;
+	time64_t suspend_time;
 
 	u32 interrupts;
 	int tx_interrupts;
diff --git a/drivers/net/wireless/intel/ipw2x00/ipw2200.c b/drivers/net/wireless/intel/ipw2x00/ipw2200.c
index 8a858f7e36f4..33186a6b28c0 100644
--- a/drivers/net/wireless/intel/ipw2x00/ipw2200.c
+++ b/drivers/net/wireless/intel/ipw2x00/ipw2200.c
@@ -11888,7 +11888,7 @@ static int ipw_pci_suspend(struct pci_dev *pdev, pm_message_t state)
 	pci_disable_device(pdev);
 	pci_set_power_state(pdev, pci_choose_state(pdev, state));
 
-	priv->suspend_at = get_seconds();
+	priv->suspend_at = ktime_get_boottime_seconds();
 
 	return 0;
 }
@@ -11925,7 +11925,7 @@ static int ipw_pci_resume(struct pci_dev *pdev)
 	 * the queue of needed */
 	netif_device_attach(dev);
 
-	priv->suspend_time = get_seconds() - priv->suspend_at;
+	priv->suspend_time = ktime_get_boottime_seconds() - priv->suspend_at;
 
 	/* Bring the device back up */
 	schedule_work(&priv->up);
diff --git a/drivers/net/wireless/intel/ipw2x00/ipw2200.h b/drivers/net/wireless/intel/ipw2x00/ipw2200.h
index aa301d1eee3c..f98ab1f71edd 100644
--- a/drivers/net/wireless/intel/ipw2x00/ipw2200.h
+++ b/drivers/net/wireless/intel/ipw2x00/ipw2200.h
@@ -1343,9 +1343,9 @@ struct ipw_priv {
 
 	s8 tx_power;
 
-	/* Track time in suspend */
-	unsigned long suspend_at;
-	unsigned long suspend_time;
+	/* Track time in suspend using CLOCK_BOOTIME */
+	time64_t suspend_at;
+	time64_t suspend_time;
 
 #ifdef CONFIG_PM
 	u32 pm_state[16];
-- 
2.9.0

Re: [PATCH 3/4] ipw2x00: track time using boottime

[Stanislav Yakovlev]

On 18/06/2018, Arnd Bergmann <arnd@arndb.de> wrote:
> The ipw2x00 driver family uses get_seconds() to read the current time
> for various purposes. This function is deprecated because of the 32-bit
> time_t overflow, and it can cause unexpected behavior when the time
> changes due to settimeofday() calls or leap second updates.
>
> In many cases, we want to use monotonic time instead, however ipw2x00
> explicitly tracks the time spent in suspend, so this changes the
> driver over to use ktime_get_boottime_seconds(), which is slightly
> slower, but not used in a fastpath here.
>
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> ---
>  drivers/net/wireless/intel/ipw2x00/ipw2100.c | 18 +++++++++---------
>  drivers/net/wireless/intel/ipw2x00/ipw2100.h | 12 ++++++------
>  drivers/net/wireless/intel/ipw2x00/ipw2200.c |  4 ++--
>  drivers/net/wireless/intel/ipw2x00/ipw2200.h |  6 +++---
>  4 files changed, 20 insertions(+), 20 deletions(-)
>

Acked-by: Stanislav Yakovlev <stas.yakovlev@gmail.com>

Looks fine, thanks!

Stanislav.

[PATCH 4/4] ath9k: use timespec64 for tsf_ts

[Arnd Bergmann]

ath9k is the last remaining user of the deprecated getrawmonotonic()
interface. There is nothing wrong with this usage, but migrating
to a timespec64 based interface lets us clean up the old API.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 drivers/net/wireless/ath/ath9k/ath9k.h   |  4 ++--
 drivers/net/wireless/ath/ath9k/channel.c | 14 +++++++-------
 drivers/net/wireless/ath/ath9k/hw.c      | 10 +++++-----
 drivers/net/wireless/ath/ath9k/hw.h      |  2 +-
 drivers/net/wireless/ath/ath9k/main.c    |  4 ++--
 5 files changed, 17 insertions(+), 17 deletions(-)

diff --git a/drivers/net/wireless/ath/ath9k/ath9k.h b/drivers/net/wireless/ath/ath9k/ath9k.h
index ef0de4f1312c..21ba20981a80 100644
--- a/drivers/net/wireless/ath/ath9k/ath9k.h
+++ b/drivers/net/wireless/ath/ath9k/ath9k.h
@@ -342,7 +342,7 @@ struct ath_chanctx {
 
 	struct ath_beacon_config beacon;
 	struct ath9k_hw_cal_data caldata;
-	struct timespec tsf_ts;
+	struct timespec64 tsf_ts;
 	u64 tsf_val;
 	u32 last_beacon;
 
@@ -1021,7 +1021,7 @@ struct ath_softc {
 	struct ath_offchannel offchannel;
 	struct ath_chanctx *next_chan;
 	struct completion go_beacon;
-	struct timespec last_event_time;
+	struct timespec64 last_event_time;
 #endif
 
 	unsigned long driver_data;
diff --git a/drivers/net/wireless/ath/ath9k/channel.c b/drivers/net/wireless/ath/ath9k/channel.c
index 1b05b5d7a038..fd61ae4782b6 100644
--- a/drivers/net/wireless/ath/ath9k/channel.c
+++ b/drivers/net/wireless/ath/ath9k/channel.c
@@ -233,9 +233,9 @@ static const char *chanctx_state_string(enum ath_chanctx_state state)
 static u32 chanctx_event_delta(struct ath_softc *sc)
 {
 	u64 ms;
-	struct timespec ts, *old;
+	struct timespec64 ts, *old;
 
-	getrawmonotonic(&ts);
+	ktime_get_raw_ts64(&ts);
 	old = &sc->last_event_time;
 	ms = ts.tv_sec * 1000 + ts.tv_nsec / 1000000;
 	ms -= old->tv_sec * 1000 + old->tv_nsec / 1000000;
@@ -334,7 +334,7 @@ ath_chanctx_get_next(struct ath_softc *sc, struct ath_chanctx *ctx)
 static void ath_chanctx_adjust_tbtt_delta(struct ath_softc *sc)
 {
 	struct ath_chanctx *prev, *cur;
-	struct timespec ts;
+	struct timespec64 ts;
 	u32 cur_tsf, prev_tsf, beacon_int;
 	s32 offset;
 
@@ -346,7 +346,7 @@ static void ath_chanctx_adjust_tbtt_delta(struct ath_softc *sc)
 	if (!prev->switch_after_beacon)
 		return;
 
-	getrawmonotonic(&ts);
+	ktime_get_raw_ts64(&ts);
 	cur_tsf = (u32) cur->tsf_val +
 		  ath9k_hw_get_tsf_offset(&cur->tsf_ts, &ts);
 
@@ -1230,7 +1230,7 @@ void ath_chanctx_set_next(struct ath_softc *sc, bool force)
 {
 	struct ath_common *common = ath9k_hw_common(sc->sc_ah);
 	struct ath_chanctx *old_ctx;
-	struct timespec ts;
+	struct timespec64 ts;
 	bool measure_time = false;
 	bool send_ps = false;
 	bool queues_stopped = false;
@@ -1260,7 +1260,7 @@ void ath_chanctx_set_next(struct ath_softc *sc, bool force)
 		spin_unlock_bh(&sc->chan_lock);
 
 		if (sc->next_chan == &sc->offchannel.chan) {
-			getrawmonotonic(&ts);
+			ktime_get_raw_ts64(&ts);
 			measure_time = true;
 		}
 
@@ -1277,7 +1277,7 @@ void ath_chanctx_set_next(struct ath_softc *sc, bool force)
 		spin_lock_bh(&sc->chan_lock);
 
 		if (sc->cur_chan != &sc->offchannel.chan) {
-			getrawmonotonic(&sc->cur_chan->tsf_ts);
+			ktime_get_raw_ts64(&sc->cur_chan->tsf_ts);
 			sc->cur_chan->tsf_val = ath9k_hw_gettsf64(sc->sc_ah);
 		}
 	}
diff --git a/drivers/net/wireless/ath/ath9k/hw.c b/drivers/net/wireless/ath/ath9k/hw.c
index e60bea4604e4..e8e1f785bc5c 100644
--- a/drivers/net/wireless/ath/ath9k/hw.c
+++ b/drivers/net/wireless/ath/ath9k/hw.c
@@ -1835,13 +1835,13 @@ static int ath9k_hw_do_fastcc(struct ath_hw *ah, struct ath9k_channel *chan)
 	return -EINVAL;
 }
 
-u32 ath9k_hw_get_tsf_offset(struct timespec *last, struct timespec *cur)
+u32 ath9k_hw_get_tsf_offset(struct timespec64 *last, struct timespec64 *cur)
 {
-	struct timespec ts;
+	struct timespec64 ts;
 	s64 usec;
 
 	if (!cur) {
-		getrawmonotonic(&ts);
+		ktime_get_raw_ts64(&ts);
 		cur = &ts;
 	}
 
@@ -1859,7 +1859,7 @@ int ath9k_hw_reset(struct ath_hw *ah, struct ath9k_channel *chan,
 	u32 saveLedState;
 	u32 saveDefAntenna;
 	u32 macStaId1;
-	struct timespec tsf_ts;
+	struct timespec64 tsf_ts;
 	u32 tsf_offset;
 	u64 tsf = 0;
 	int r;
@@ -1905,7 +1905,7 @@ int ath9k_hw_reset(struct ath_hw *ah, struct ath9k_channel *chan,
 	macStaId1 = REG_READ(ah, AR_STA_ID1) & AR_STA_ID1_BASE_RATE_11B;
 
 	/* Save TSF before chip reset, a cold reset clears it */
-	getrawmonotonic(&tsf_ts);
+	ktime_get_raw_ts64(&tsf_ts);
 	tsf = ath9k_hw_gettsf64(ah);
 
 	saveLedState = REG_READ(ah, AR_CFG_LED) &
diff --git a/drivers/net/wireless/ath/ath9k/hw.h b/drivers/net/wireless/ath/ath9k/hw.h
index 9804a24a2dc0..68956cdc8c9a 100644
--- a/drivers/net/wireless/ath/ath9k/hw.h
+++ b/drivers/net/wireless/ath/ath9k/hw.h
@@ -1060,7 +1060,7 @@ u32 ath9k_hw_gettsf32(struct ath_hw *ah);
 u64 ath9k_hw_gettsf64(struct ath_hw *ah);
 void ath9k_hw_settsf64(struct ath_hw *ah, u64 tsf64);
 void ath9k_hw_reset_tsf(struct ath_hw *ah);
-u32 ath9k_hw_get_tsf_offset(struct timespec *last, struct timespec *cur);
+u32 ath9k_hw_get_tsf_offset(struct timespec64 *last, struct timespec64 *cur);
 void ath9k_hw_set_tsfadjust(struct ath_hw *ah, bool set);
 void ath9k_hw_init_global_settings(struct ath_hw *ah);
 u32 ar9003_get_pll_sqsum_dvc(struct ath_hw *ah);
diff --git a/drivers/net/wireless/ath/ath9k/main.c b/drivers/net/wireless/ath/ath9k/main.c
index b6663c80e7dd..acb681b096d9 100644
--- a/drivers/net/wireless/ath/ath9k/main.c
+++ b/drivers/net/wireless/ath/ath9k/main.c
@@ -1865,7 +1865,7 @@ static void ath9k_set_tsf(struct ieee80211_hw *hw,
 	mutex_lock(&sc->mutex);
 	ath9k_ps_wakeup(sc);
 	tsf -= le64_to_cpu(avp->tsf_adjust);
-	getrawmonotonic(&avp->chanctx->tsf_ts);
+	ktime_get_raw_ts64(&avp->chanctx->tsf_ts);
 	if (sc->cur_chan == avp->chanctx)
 		ath9k_hw_settsf64(sc->sc_ah, tsf);
 	avp->chanctx->tsf_val = tsf;
@@ -1881,7 +1881,7 @@ static void ath9k_reset_tsf(struct ieee80211_hw *hw, struct ieee80211_vif *vif)
 	mutex_lock(&sc->mutex);
 
 	ath9k_ps_wakeup(sc);
-	getrawmonotonic(&avp->chanctx->tsf_ts);
+	ktime_get_raw_ts64(&avp->chanctx->tsf_ts);
 	if (sc->cur_chan == avp->chanctx)
 		ath9k_hw_reset_tsf(sc->sc_ah);
 	avp->chanctx->tsf_val = 0;
-- 
2.9.0

Re: [4/4] ath9k: use timespec64 for tsf_ts

[Kalle Valo]

Arnd Bergmann <arnd@arndb.de> wrote:

> ath9k is the last remaining user of the deprecated getrawmonotonic()
> interface. There is nothing wrong with this usage, but migrating
> to a timespec64 based interface lets us clean up the old API.
> 
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

Patch applied to ath-next branch of ath.git, thanks.

fe041deba4f6 ath9k: use timespec64 for tsf_ts

-- 
https://patchwork.kernel.org/patch/10471987/

https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches