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authorJussi Kivilinna <jussi.kivilinna@mbnet.fi>2011-06-20 14:42:49 +0300
committerJohn W. Linville <linville@tuxdriver.com>2011-06-22 16:09:46 -0400
commitdde4673b8d73dd873e1a62774728e4b7f972facd (patch)
treefaa6e98a32e5ff37437aef30886534bddfb8d696 /drivers/net/wireless/zd1211rw/zd_mac.c
parentc900eff30a14ecf209ee7a17a7c3c54890694ce6 (diff)
downloadop-kernel-dev-dde4673b8d73dd873e1a62774728e4b7f972facd.zip
op-kernel-dev-dde4673b8d73dd873e1a62774728e4b7f972facd.tar.gz
zd1211rw: don't let zd_mac_config_beacon() run too long from beacon interrupt handler
zd_mac_config_beacon() has only limited time to set up beacon when called from beacon interrupt handler/worker. So do not let it retry acquiring beacon fifo semaphore in interrupt handler. Beacon fifo semaphore should not be locked by firmware anyway at this time, it's only locked when device is using/txing beacon. Signed-off-by: Jussi Kivilinna <jussi.kivilinna@mbnet.fi> Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'drivers/net/wireless/zd1211rw/zd_mac.c')
-rw-r--r--drivers/net/wireless/zd1211rw/zd_mac.c19
1 files changed, 12 insertions, 7 deletions
diff --git a/drivers/net/wireless/zd1211rw/zd_mac.c b/drivers/net/wireless/zd1211rw/zd_mac.c
index 0828605..b67c52d 100644
--- a/drivers/net/wireless/zd1211rw/zd_mac.c
+++ b/drivers/net/wireless/zd1211rw/zd_mac.c
@@ -143,7 +143,7 @@ static void beacon_enable(struct zd_mac *mac);
static void beacon_disable(struct zd_mac *mac);
static void set_rts_cts(struct zd_mac *mac, unsigned int short_preamble);
static int zd_mac_config_beacon(struct ieee80211_hw *hw,
- struct sk_buff *beacon);
+ struct sk_buff *beacon, bool in_intr);
static int zd_reg2alpha2(u8 regdomain, char *alpha2)
{
@@ -404,7 +404,7 @@ int zd_restore_settings(struct zd_mac *mac)
if (mac->vif != NULL) {
beacon = ieee80211_beacon_get(mac->hw, mac->vif);
if (beacon)
- zd_mac_config_beacon(mac->hw, beacon);
+ zd_mac_config_beacon(mac->hw, beacon, false);
}
zd_set_beacon_interval(&mac->chip, beacon_interval,
@@ -704,7 +704,8 @@ static void zd_mac_free_cur_beacon(struct zd_mac *mac)
mutex_unlock(&mac->chip.mutex);
}
-static int zd_mac_config_beacon(struct ieee80211_hw *hw, struct sk_buff *beacon)
+static int zd_mac_config_beacon(struct ieee80211_hw *hw, struct sk_buff *beacon,
+ bool in_intr)
{
struct zd_mac *mac = zd_hw_mac(hw);
int r, ret, num_cmds, req_pos = 0;
@@ -736,6 +737,10 @@ static int zd_mac_config_beacon(struct ieee80211_hw *hw, struct sk_buff *beacon)
r = zd_ioread32_locked(&mac->chip, &tmp, CR_BCN_FIFO_SEMAPHORE);
if (r < 0)
goto release_sema;
+ if (in_intr && tmp & 0x2) {
+ r = -EBUSY;
+ goto release_sema;
+ }
end_jiffies = jiffies + HZ / 2; /*~500ms*/
message_jiffies = jiffies + HZ / 10; /*~100ms*/
@@ -790,7 +795,7 @@ release_sema:
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)) {
+ if (in_intr || time_is_before_eq_jiffies(end_jiffies)) {
ret = -ETIMEDOUT;
break;
}
@@ -1161,7 +1166,7 @@ static void zd_beacon_done(struct zd_mac *mac)
*/
beacon = ieee80211_beacon_get(mac->hw, mac->vif);
if (beacon)
- zd_mac_config_beacon(mac->hw, beacon);
+ zd_mac_config_beacon(mac->hw, beacon, true);
spin_lock_irq(&mac->lock);
mac->beacon.last_update = jiffies;
@@ -1286,7 +1291,7 @@ static void zd_op_bss_info_changed(struct ieee80211_hw *hw,
if (beacon) {
zd_chip_disable_hwint(&mac->chip);
- zd_mac_config_beacon(hw, beacon);
+ zd_mac_config_beacon(hw, beacon, false);
zd_chip_enable_hwint(&mac->chip);
}
}
@@ -1439,7 +1444,7 @@ static void beacon_watchdog_handler(struct work_struct *work)
if (beacon) {
zd_mac_free_cur_beacon(mac);
- zd_mac_config_beacon(mac->hw, beacon);
+ zd_mac_config_beacon(mac->hw, beacon, false);
}
zd_set_beacon_interval(&mac->chip, interval, period, mac->type);
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