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-rw-r--r--drivers/net/wireless/zd1211rw/zd_mac.c188
-rw-r--r--drivers/net/wireless/zd1211rw/zd_mac.h13
2 files changed, 170 insertions, 31 deletions
diff --git a/drivers/net/wireless/zd1211rw/zd_mac.c b/drivers/net/wireless/zd1211rw/zd_mac.c
index 49ab3c357100..78c8f8ba50f6 100644
--- a/drivers/net/wireless/zd1211rw/zd_mac.c
+++ b/drivers/net/wireless/zd1211rw/zd_mac.c
@@ -138,6 +138,9 @@ static const struct ieee80211_channel zd_channels[] = {
static void housekeeping_init(struct zd_mac *mac);
static void housekeeping_enable(struct zd_mac *mac);
static void housekeeping_disable(struct zd_mac *mac);
+static void beacon_init(struct zd_mac *mac);
+static void beacon_enable(struct zd_mac *mac);
+static void beacon_disable(struct zd_mac *mac);
static int zd_reg2alpha2(u8 regdomain, char *alpha2)
{
@@ -295,6 +298,8 @@ static int zd_op_start(struct ieee80211_hw *hw)
goto disable_rxtx;
housekeeping_enable(mac);
+ beacon_enable(mac);
+ set_bit(ZD_DEVICE_RUNNING, &mac->flags);
return 0;
disable_rxtx:
zd_chip_disable_rxtx(chip);
@@ -313,12 +318,15 @@ static void zd_op_stop(struct ieee80211_hw *hw)
struct sk_buff *skb;
struct sk_buff_head *ack_wait_queue = &mac->ack_wait_queue;
+ clear_bit(ZD_DEVICE_RUNNING, &mac->flags);
+
/* The order here deliberately is a little different from the open()
* method, since we need to make sure there is no opportunity for RX
* frames to be processed by mac80211 after we have stopped it.
*/
zd_chip_disable_rxtx(chip);
+ beacon_disable(mac);
housekeeping_disable(mac);
flush_workqueue(zd_workqueue);
@@ -594,64 +602,99 @@ static void cs_set_control(struct zd_mac *mac, struct zd_ctrlset *cs,
static int zd_mac_config_beacon(struct ieee80211_hw *hw, struct sk_buff *beacon)
{
struct zd_mac *mac = zd_hw_mac(hw);
- int r;
+ int r, ret;
u32 tmp, j = 0;
/* 4 more bytes for tail CRC */
u32 full_len = beacon->len + 4;
+ unsigned long end_jiffies, message_jiffies;
+
+ mutex_lock(&mac->chip.mutex);
- r = zd_iowrite32(&mac->chip, CR_BCN_FIFO_SEMAPHORE, 0);
+ r = zd_iowrite32_locked(&mac->chip, 0, CR_BCN_FIFO_SEMAPHORE);
if (r < 0)
- return r;
- r = zd_ioread32(&mac->chip, CR_BCN_FIFO_SEMAPHORE, &tmp);
+ goto out;
+ r = zd_ioread32_locked(&mac->chip, &tmp, CR_BCN_FIFO_SEMAPHORE);
if (r < 0)
- return r;
+ goto release_sema;
+ end_jiffies = jiffies + HZ / 2; /*~500ms*/
+ message_jiffies = jiffies + HZ / 10; /*~100ms*/
while (tmp & 0x2) {
- r = zd_ioread32(&mac->chip, CR_BCN_FIFO_SEMAPHORE, &tmp);
+ r = zd_ioread32_locked(&mac->chip, &tmp, CR_BCN_FIFO_SEMAPHORE);
if (r < 0)
- return r;
- if ((++j % 100) == 0) {
- printk(KERN_ERR "CR_BCN_FIFO_SEMAPHORE not ready\n");
- if (j >= 500) {
- printk(KERN_ERR "Giving up beacon config.\n");
- return -ETIMEDOUT;
+ goto release_sema;
+ if (time_is_before_eq_jiffies(message_jiffies)) {
+ message_jiffies = jiffies + HZ / 10;
+ dev_err(zd_mac_dev(mac),
+ "CR_BCN_FIFO_SEMAPHORE not ready\n");
+ if (time_is_before_eq_jiffies(end_jiffies)) {
+ dev_err(zd_mac_dev(mac),
+ "Giving up beacon config.\n");
+ r = -ETIMEDOUT;
+ goto release_sema;
}
}
- msleep(1);
+ msleep(20);
}
- r = zd_iowrite32(&mac->chip, CR_BCN_FIFO, full_len - 1);
+ r = zd_iowrite32_locked(&mac->chip, full_len - 1, CR_BCN_FIFO);
if (r < 0)
- return r;
+ goto release_sema;
if (zd_chip_is_zd1211b(&mac->chip)) {
- r = zd_iowrite32(&mac->chip, CR_BCN_LENGTH, full_len - 1);
+ r = zd_iowrite32_locked(&mac->chip, full_len - 1,
+ CR_BCN_LENGTH);
if (r < 0)
- return r;
+ goto release_sema;
}
for (j = 0 ; j < beacon->len; j++) {
- r = zd_iowrite32(&mac->chip, CR_BCN_FIFO,
- *((u8 *)(beacon->data + j)));
+ r = zd_iowrite32_locked(&mac->chip, *((u8 *)(beacon->data + j)),
+ CR_BCN_FIFO);
if (r < 0)
- return r;
+ goto release_sema;
}
for (j = 0; j < 4; j++) {
- r = zd_iowrite32(&mac->chip, CR_BCN_FIFO, 0x0);
+ r = zd_iowrite32_locked(&mac->chip, 0x0, CR_BCN_FIFO);
if (r < 0)
- return r;
+ goto release_sema;
}
- r = zd_iowrite32(&mac->chip, CR_BCN_FIFO_SEMAPHORE, 1);
- if (r < 0)
- return r;
+release_sema:
+ /*
+ * Try very hard to release device beacon semaphore, as otherwise
+ * device/driver can be left in unusable state.
+ */
+ end_jiffies = jiffies + HZ / 2; /*~500ms*/
+ ret = zd_iowrite32_locked(&mac->chip, 1, CR_BCN_FIFO_SEMAPHORE);
+ while (ret < 0) {
+ if (time_is_before_eq_jiffies(end_jiffies)) {
+ ret = -ETIMEDOUT;
+ break;
+ }
+
+ msleep(20);
+ ret = zd_iowrite32_locked(&mac->chip, 1, CR_BCN_FIFO_SEMAPHORE);
+ }
+
+ if (ret < 0)
+ dev_err(zd_mac_dev(mac), "Could not release "
+ "CR_BCN_FIFO_SEMAPHORE!\n");
+ if (r < 0 || ret < 0) {
+ if (r >= 0)
+ r = ret;
+ goto out;
+ }
/* 802.11b/g 2.4G CCK 1Mb
* 802.11a, not yet implemented, uses different values (see GPL vendor
* driver)
*/
- return zd_iowrite32(&mac->chip, CR_BCN_PLCP_CFG, 0x00000400 |
- (full_len << 19));
+ r = zd_iowrite32_locked(&mac->chip, 0x00000400 | (full_len << 19),
+ CR_BCN_PLCP_CFG);
+out:
+ mutex_unlock(&mac->chip.mutex);
+ return r;
}
static int fill_ctrlset(struct zd_mac *mac,
@@ -942,6 +985,8 @@ static void zd_beacon_done(struct zd_mac *mac)
{
struct sk_buff *skb, *beacon;
+ if (!test_bit(ZD_DEVICE_RUNNING, &mac->flags))
+ return;
if (!mac->vif || mac->vif->type != NL80211_IFTYPE_AP)
return;
@@ -959,11 +1004,14 @@ static void zd_beacon_done(struct zd_mac *mac)
* Fetch next beacon so that tim_count is updated.
*/
beacon = ieee80211_beacon_get(mac->hw, mac->vif);
- if (!beacon)
- return;
+ if (beacon) {
+ zd_mac_config_beacon(mac->hw, beacon);
+ kfree_skb(beacon);
+ }
- zd_mac_config_beacon(mac->hw, beacon);
- kfree_skb(beacon);
+ spin_lock_irq(&mac->lock);
+ mac->beacon.last_update = jiffies;
+ spin_unlock_irq(&mac->lock);
}
static void zd_process_intr(struct work_struct *work)
@@ -1082,7 +1130,9 @@ static void zd_op_bss_info_changed(struct ieee80211_hw *hw,
struct sk_buff *beacon = ieee80211_beacon_get(hw, vif);
if (beacon) {
+ zd_chip_disable_hwint(&mac->chip);
zd_mac_config_beacon(hw, beacon);
+ zd_chip_enable_hwint(&mac->chip);
kfree_skb(beacon);
}
}
@@ -1096,6 +1146,12 @@ static void zd_op_bss_info_changed(struct ieee80211_hw *hw,
interval = bss_conf->beacon_int;
}
+ spin_lock_irq(&mac->lock);
+ mac->beacon.period = period;
+ mac->beacon.interval = interval;
+ mac->beacon.last_update = jiffies;
+ spin_unlock_irq(&mac->lock);
+
zd_set_beacon_interval(&mac->chip, interval, period,
mac->type);
}
@@ -1188,12 +1244,82 @@ struct ieee80211_hw *zd_mac_alloc_hw(struct usb_interface *intf)
zd_chip_init(&mac->chip, hw, intf);
housekeeping_init(mac);
+ beacon_init(mac);
INIT_WORK(&mac->process_intr, zd_process_intr);
SET_IEEE80211_DEV(hw, &intf->dev);
return hw;
}
+#define BEACON_WATCHDOG_DELAY round_jiffies_relative(HZ)
+
+static void beacon_watchdog_handler(struct work_struct *work)
+{
+ struct zd_mac *mac =
+ container_of(work, struct zd_mac, beacon.watchdog_work.work);
+ struct sk_buff *beacon;
+ unsigned long timeout;
+ int interval, period;
+
+ if (!test_bit(ZD_DEVICE_RUNNING, &mac->flags))
+ goto rearm;
+ if (mac->type != NL80211_IFTYPE_AP || !mac->vif)
+ goto rearm;
+
+ spin_lock_irq(&mac->lock);
+ interval = mac->beacon.interval;
+ period = mac->beacon.period;
+ timeout = mac->beacon.last_update + msecs_to_jiffies(interval) + HZ;
+ spin_unlock_irq(&mac->lock);
+
+ if (interval > 0 && time_is_before_jiffies(timeout)) {
+ dev_dbg_f(zd_mac_dev(mac), "beacon interrupt stalled, "
+ "restarting. "
+ "(interval: %d, dtim: %d)\n",
+ interval, period);
+
+ zd_chip_disable_hwint(&mac->chip);
+
+ beacon = ieee80211_beacon_get(mac->hw, mac->vif);
+ if (beacon) {
+ zd_mac_config_beacon(mac->hw, beacon);
+ kfree_skb(beacon);
+ }
+
+ zd_set_beacon_interval(&mac->chip, interval, period, mac->type);
+
+ zd_chip_enable_hwint(&mac->chip);
+
+ spin_lock_irq(&mac->lock);
+ mac->beacon.last_update = jiffies;
+ spin_unlock_irq(&mac->lock);
+ }
+
+rearm:
+ queue_delayed_work(zd_workqueue, &mac->beacon.watchdog_work,
+ BEACON_WATCHDOG_DELAY);
+}
+
+static void beacon_init(struct zd_mac *mac)
+{
+ INIT_DELAYED_WORK(&mac->beacon.watchdog_work, beacon_watchdog_handler);
+}
+
+static void beacon_enable(struct zd_mac *mac)
+{
+ dev_dbg_f(zd_mac_dev(mac), "\n");
+
+ mac->beacon.last_update = jiffies;
+ queue_delayed_work(zd_workqueue, &mac->beacon.watchdog_work,
+ BEACON_WATCHDOG_DELAY);
+}
+
+static void beacon_disable(struct zd_mac *mac)
+{
+ dev_dbg_f(zd_mac_dev(mac), "\n");
+ cancel_delayed_work_sync(&mac->beacon.watchdog_work);
+}
+
#define LINK_LED_WORK_DELAY HZ
static void link_led_handler(struct work_struct *work)
diff --git a/drivers/net/wireless/zd1211rw/zd_mac.h b/drivers/net/wireless/zd1211rw/zd_mac.h
index 0ec6bde0b37c..281b3079311a 100644
--- a/drivers/net/wireless/zd1211rw/zd_mac.h
+++ b/drivers/net/wireless/zd1211rw/zd_mac.h
@@ -163,6 +163,17 @@ struct housekeeping {
struct delayed_work link_led_work;
};
+struct beacon {
+ struct delayed_work watchdog_work;
+ unsigned long last_update;
+ u16 interval;
+ u8 period;
+};
+
+enum zd_device_flags {
+ ZD_DEVICE_RUNNING,
+};
+
#define ZD_MAC_STATS_BUFFER_SIZE 16
#define ZD_MAC_MAX_ACK_WAITERS 50
@@ -174,6 +185,7 @@ struct zd_mac {
struct ieee80211_hw *hw;
struct ieee80211_vif *vif;
struct housekeeping housekeeping;
+ struct beacon beacon;
struct work_struct set_rts_cts_work;
struct work_struct process_intr;
struct zd_mc_hash multicast_hash;
@@ -182,6 +194,7 @@ struct zd_mac {
u8 default_regdomain;
int type;
int associated;
+ unsigned long flags;
struct sk_buff_head ack_wait_queue;
struct ieee80211_channel channels[14];
struct ieee80211_rate rates[12];
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.