diff options
| -rw-r--r-- | drivers/net/wireless/b43/b43.h | 23 | ||||
| -rw-r--r-- | drivers/net/wireless/b43/debugfs.c | 53 | ||||
| -rw-r--r-- | drivers/net/wireless/b43/debugfs.h | 3 | ||||
| -rw-r--r-- | drivers/net/wireless/b43/dma.c | 5 | ||||
| -rw-r--r-- | drivers/net/wireless/b43/main.c | 319 | ||||
| -rw-r--r-- | drivers/net/wireless/b43/phy_common.c | 1 | ||||
| -rw-r--r-- | drivers/net/wireless/b43/phy_common.h | 3 | ||||
| -rw-r--r-- | drivers/net/wireless/b43/phy_g.c | 7 | ||||
| -rw-r--r-- | drivers/net/wireless/b43/phy_g.h | 3 | ||||
| -rw-r--r-- | drivers/net/wireless/b43/pio.c | 5 | ||||
| -rw-r--r-- | drivers/net/wireless/b43/sysfs.c | 3 |
11 files changed, 204 insertions, 221 deletions
diff --git a/drivers/net/wireless/b43/b43.h b/drivers/net/wireless/b43/b43.h index a1b3b731935..d63af926d05 100644 --- a/drivers/net/wireless/b43/b43.h +++ b/drivers/net/wireless/b43/b43.h @@ -616,6 +616,12 @@ struct b43_wl { /* Pointer to the ieee80211 hardware data structure */ struct ieee80211_hw *hw; + /* Global driver mutex. Every operation must run with this mutex locked. */ + struct mutex mutex; + /* Hard-IRQ spinlock. This lock protects things used in the hard-IRQ + * handler, only. This basically is just the IRQ mask register. */ + spinlock_t hardirq_lock; + /* The number of queues that were registered with the mac80211 subsystem * initially. This is a backup copy of hw->queues in case hw->queues has * to be dynamically lowered at runtime (Firmware does not support QoS). @@ -623,8 +629,6 @@ struct b43_wl { * from the mac80211 subsystem. */ u16 mac80211_initially_registered_queues; - struct mutex mutex; - spinlock_t irq_lock; /* R/W lock for data transmission. * Transmissions on 2+ queues can run concurrently, but somebody else * might sync with TX by write_lock_irqsave()'ing. */ @@ -665,8 +669,7 @@ struct b43_wl { bool radiotap_enabled; bool radio_enabled; - /* The beacon we are currently using (AP or IBSS mode). - * This beacon stuff is protected by the irq_lock. */ + /* The beacon we are currently using (AP or IBSS mode). */ struct sk_buff *current_beacon; bool beacon0_uploaded; bool beacon1_uploaded; @@ -754,14 +757,6 @@ enum { smp_wmb(); \ } while (0) -/* XXX--- HOW LOCKING WORKS IN B43 ---XXX - * - * You should always acquire both, wl->mutex and wl->irq_lock unless: - * - You don't need to acquire wl->irq_lock, if the interface is stopped. - * - You don't need to acquire wl->mutex in the IRQ handler, IRQ tasklet - * and packet TX path (and _ONLY_ there.) - */ - /* Data structure for one wireless device (802.11 core) */ struct b43_wldev { struct ssb_device *dev; @@ -807,14 +802,12 @@ struct b43_wldev { u32 dma_reason[6]; /* The currently active generic-interrupt mask. */ u32 irq_mask; + /* Link Quality calculation context. */ struct b43_noise_calculation noisecalc; /* if > 0 MAC is suspended. if == 0 MAC is enabled. */ int mac_suspended; - /* Interrupt Service Routine tasklet (bottom-half) */ - struct tasklet_struct isr_tasklet; - /* Periodic tasks */ struct delayed_work periodic_work; unsigned int periodic_state; diff --git a/drivers/net/wireless/b43/debugfs.c b/drivers/net/wireless/b43/debugfs.c index 45e3d6af69f..bf23a3a863f 100644 --- a/drivers/net/wireless/b43/debugfs.c +++ b/drivers/net/wireless/b43/debugfs.c @@ -46,8 +46,6 @@ struct b43_debugfs_fops { struct file_operations fops; /* Offset of struct b43_dfs_file in struct b43_dfsentry */ size_t file_struct_offset; - /* Take wl->irq_lock before calling read/write? */ - bool take_irqlock; }; static inline @@ -372,14 +370,12 @@ static ssize_t txstat_read_file(struct b43_wldev *dev, { struct b43_txstatus_log *log = &dev->dfsentry->txstatlog; ssize_t count = 0; - unsigned long flags; int i, idx; struct b43_txstatus *stat; - spin_lock_irqsave(&log->lock, flags); if (log->end < 0) { fappend("Nothing transmitted, yet\n"); - goto out_unlock; + goto out; } fappend("b43 TX status reports:\n\n" "index | cookie | seq | phy_stat | frame_count | " @@ -409,13 +405,11 @@ static ssize_t txstat_read_file(struct b43_wldev *dev, break; i++; } -out_unlock: - spin_unlock_irqrestore(&log->lock, flags); +out: return count; } -/* wl->irq_lock is locked */ static int restart_write_file(struct b43_wldev *dev, const char *buf, size_t count) { @@ -556,12 +550,7 @@ static ssize_t b43_debugfs_read(struct file *file, char __user *userbuf, goto out_unlock; } memset(buf, 0, bufsize); - if (dfops->take_irqlock) { - spin_lock_irq(&dev->wl->irq_lock); - ret = dfops->read(dev, buf, bufsize); - spin_unlock_irq(&dev->wl->irq_lock); - } else - ret = dfops->read(dev, buf, bufsize); + ret = dfops->read(dev, buf, bufsize); if (ret <= 0) { free_pages((unsigned long)buf, buforder); err = ret; @@ -623,12 +612,7 @@ static ssize_t b43_debugfs_write(struct file *file, err = -EFAULT; goto out_freepage; } - if (dfops->take_irqlock) { - spin_lock_irq(&dev->wl->irq_lock); - err = dfops->write(dev, buf, count); - spin_unlock_irq(&dev->wl->irq_lock); - } else - err = dfops->write(dev, buf, count); + err = dfops->write(dev, buf, count); if (err) goto out_freepage; @@ -641,7 +625,7 @@ out_unlock: } -#define B43_DEBUGFS_FOPS(name, _read, _write, _take_irqlock) \ +#define B43_DEBUGFS_FOPS(name, _read, _write) \ static struct b43_debugfs_fops fops_##name = { \ .read = _read, \ .write = _write, \ @@ -652,20 +636,19 @@ out_unlock: }, \ .file_struct_offset = offsetof(struct b43_dfsentry, \ file_##name), \ - .take_irqlock = _take_irqlock, \ } -B43_DEBUGFS_FOPS(shm16read, shm16read__read_file, shm16read__write_file, 1); -B43_DEBUGFS_FOPS(shm16write, NULL, shm16write__write_file, 1); -B43_DEBUGFS_FOPS(shm32read, shm32read__read_file, shm32read__write_file, 1); -B43_DEBUGFS_FOPS(shm32write, NULL, shm32write__write_file, 1); -B43_DEBUGFS_FOPS(mmio16read, mmio16read__read_file, mmio16read__write_file, 1); -B43_DEBUGFS_FOPS(mmio16write, NULL, mmio16write__write_file, 1); -B43_DEBUGFS_FOPS(mmio32read, mmio32read__read_file, mmio32read__write_file, 1); -B43_DEBUGFS_FOPS(mmio32write, NULL, mmio32write__write_file, 1); -B43_DEBUGFS_FOPS(txstat, txstat_read_file, NULL, 0); -B43_DEBUGFS_FOPS(restart, NULL, restart_write_file, 1); -B43_DEBUGFS_FOPS(loctls, loctls_read_file, NULL, 0); +B43_DEBUGFS_FOPS(shm16read, shm16read__read_file, shm16read__write_file); +B43_DEBUGFS_FOPS(shm16write, NULL, shm16write__write_file); +B43_DEBUGFS_FOPS(shm32read, shm32read__read_file, shm32read__write_file); +B43_DEBUGFS_FOPS(shm32write, NULL, shm32write__write_file); +B43_DEBUGFS_FOPS(mmio16read, mmio16read__read_file, mmio16read__write_file); +B43_DEBUGFS_FOPS(mmio16write, NULL, mmio16write__write_file); +B43_DEBUGFS_FOPS(mmio32read, mmio32read__read_file, mmio32read__write_file); +B43_DEBUGFS_FOPS(mmio32write, NULL, mmio32write__write_file); +B43_DEBUGFS_FOPS(txstat, txstat_read_file, NULL); +B43_DEBUGFS_FOPS(restart, NULL, restart_write_file); +B43_DEBUGFS_FOPS(loctls, loctls_read_file, NULL); bool b43_debug(struct b43_wldev *dev, enum b43_dyndbg feature) @@ -738,7 +721,6 @@ void b43_debugfs_add_device(struct b43_wldev *dev) return; } log->end = -1; - spin_lock_init(&log->lock); dev->dfsentry = e; @@ -822,7 +804,6 @@ void b43_debugfs_remove_device(struct b43_wldev *dev) kfree(e); } -/* Called with IRQs disabled. */ void b43_debugfs_log_txstat(struct b43_wldev *dev, const struct b43_txstatus *status) { @@ -834,14 +815,12 @@ void b43_debugfs_log_txstat(struct b43_wldev *dev, if (!e) return; log = &e->txstatlog; - spin_lock(&log->lock); /* IRQs are already disabled. */ i = log->end + 1; if (i == B43_NR_LOGGED_TXSTATUS) i = 0; log->end = i; cur = &(log->log[i]); memcpy(cur, status, sizeof(*cur)); - spin_unlock(&log->lock); } void b43_debugfs_init(void) diff --git a/drivers/net/wireless/b43/debugfs.h b/drivers/net/wireless/b43/debugfs.h index b9d4de4a979..e47b4b488b0 100644 --- a/drivers/net/wireless/b43/debugfs.h +++ b/drivers/net/wireless/b43/debugfs.h @@ -23,9 +23,10 @@ struct dentry; #define B43_NR_LOGGED_TXSTATUS 100 struct b43_txstatus_log { + /* This structure is protected by wl->mutex */ + struct b43_txstatus *log; int end; - spinlock_t lock; }; struct b43_dfs_file { diff --git a/drivers/net/wireless/b43/dma.c b/drivers/net/wireless/b43/dma.c index 289aaf6dfe7..25ced8bdec8 100644 --- a/drivers/net/wireless/b43/dma.c +++ b/drivers/net/wireless/b43/dma.c @@ -1387,7 +1387,6 @@ out_unlock: return err; } -/* Called with IRQs disabled. */ void b43_dma_handle_txstatus(struct b43_wldev *dev, const struct b43_txstatus *status) { @@ -1402,7 +1401,7 @@ void b43_dma_handle_txstatus(struct b43_wldev *dev, if (unlikely(!ring)) return; - spin_lock(&ring->lock); /* IRQs are already disabled. */ + spin_lock_irq(&ring->lock); B43_WARN_ON(!ring->tx); ops = ring->ops; @@ -1463,7 +1462,7 @@ void b43_dma_handle_txstatus(struct b43_wldev *dev, } } - spin_unlock(&ring->lock); + spin_unlock_irq(&ring->lock); } void b43_dma_get_tx_stats(struct b43_wldev *dev, diff --git a/drivers/net/wireless/b43/main.c b/drivers/net/wireless/b43/main.c index ae05f667114..80b688441ff 100644 --- a/drivers/net/wireless/b43/main.c +++ b/drivers/net/wireless/b43/main.c @@ -291,7 +291,7 @@ static struct ieee80211_supported_band b43_band_2GHz = { static void b43_wireless_core_exit(struct b43_wldev *dev); static int b43_wireless_core_init(struct b43_wldev *dev); -static void b43_wireless_core_stop(struct b43_wldev *dev); +static struct b43_wldev * b43_wireless_core_stop(struct b43_wldev *dev); static int b43_wireless_core_start(struct b43_wldev *dev); static int b43_ratelimit(struct b43_wl *wl) @@ -685,16 +685,6 @@ static void b43_short_slot_timing_disable(struct b43_wldev *dev) b43_set_slot_time(dev, 20); } -/* Synchronize IRQ top- and bottom-half. - * IRQs must be masked before calling this. - * This must not be called with the irq_lock held. - */ -static void b43_synchronize_irq(struct b43_wldev *dev) -{ - synchronize_irq(dev->dev->irq); - tasklet_kill(&dev->isr_tasklet); -} - /* DummyTransmission function, as documented on * http://bcm-v4.sipsolutions.net/802.11/DummyTransmission */ @@ -720,8 +710,7 @@ void b43_dummy_transmission(struct b43_wldev *dev, bool ofdm, bool pa_on) buffer[0] = 0x000B846E; } - spin_lock_irq(&wl->irq_lock); - write_lock(&wl->tx_lock); + write_lock_irq(&wl->tx_lock); for (i = 0; i < 5; i++) b43_ram_write(dev, i * 4, buffer[i]); @@ -779,8 +768,7 @@ void b43_dummy_transmission(struct b43_wldev *dev, bool ofdm, bool pa_on) if (phy->radio_ver == 0x2050 && phy->radio_rev <= 0x5) b43_radio_write16(dev, 0x0051, 0x0037); - write_unlock(&wl->tx_lock); - spin_unlock_irq(&wl->irq_lock); + write_unlock_irq(&wl->tx_lock); } static void key_write(struct b43_wldev *dev, @@ -1620,6 +1608,27 @@ static void handle_irq_beacon(struct b43_wldev *dev) } } +static void b43_do_beacon_update_trigger_work(struct b43_wldev *dev) +{ + u32 old_irq_mask = dev->irq_mask; + + /* update beacon right away or defer to irq */ + handle_irq_beacon(dev); + if (old_irq_mask != dev->irq_mask) { + /* The handler updated the IRQ mask. */ + B43_WARN_ON(!dev->irq_mask); + if (b43_read32(dev, B43_MMIO_GEN_IRQ_MASK)) { + b43_write32(dev, B43_MMIO_GEN_IRQ_MASK, dev->irq_mask); + } else { + /* Device interrupts are currently disabled. That means + * we just ran the hardirq handler and scheduled the + * IRQ thread. The thread will write the IRQ mask when + * it finished, so there's nothing to do here. Writing + * the mask _here_ would incorrectly re-enable IRQs. */ + } + } +} + static void b43_beacon_update_trigger_work(struct work_struct *work) { struct b43_wl *wl = container_of(work, struct b43_wl, @@ -1629,19 +1638,22 @@ static void b43_beacon_update_trigger_work(struct work_struct *work) mutex_lock(&wl->mutex); dev = wl->current_dev; if (likely(dev && (b43_status(dev) >= B43_STAT_INITIALIZED))) { - spin_lock_irq(&wl->irq_lock); - /* update beacon right away or defer to irq */ - handle_irq_beacon(dev); - /* The handler might have updated the IRQ mask. */ - b43_write32(dev, B43_MMIO_GEN_IRQ_MASK, dev->irq_mask); - mmiowb(); - spin_unlock_irq(&wl->irq_lock); + if (0 /*FIXME dev->dev->bus->bustype == SSB_BUSTYPE_SDIO*/) { + /* wl->mutex is enough. */ + b43_do_beacon_update_trigger_work(dev); + mmiowb(); + } else { + spin_lock_irq(&wl->hardirq_lock); + b43_do_beacon_update_trigger_work(dev); + mmiowb(); + spin_unlock_irq(&wl->hardirq_lock); + } } mutex_unlock(&wl->mutex); } /* Asynchronously update the packet templates in template RAM. - * Locking: Requires wl->irq_lock to be locked. */ + * Locking: Requires wl->mutex to be locked. */ static void b43_update_templates(struct b43_wl *wl) { struct sk_buff *beacon; @@ -1778,18 +1790,15 @@ out: B43_DEBUGIRQ_REASON_REG, B43_DEBUGIRQ_ACK); } -/* Interrupt handler bottom-half */ -static void b43_interrupt_tasklet(struct b43_wldev *dev) +static void b43_do_interrupt_thread(struct b43_wldev *dev) { u32 reason; u32 dma_reason[ARRAY_SIZE(dev->dma_reason)]; u32 merged_dma_reason = 0; int i; - unsigned long flags; - - spin_lock_irqsave(&dev->wl->irq_lock, flags); - B43_WARN_ON(b43_status(dev) != B43_STAT_STARTED); + if (unlikely(b43_status(dev) != B43_STAT_STARTED)) + return; reason = dev->irq_reason; for (i = 0; i < ARRAY_SIZE(dma_reason); i++) { @@ -1822,8 +1831,6 @@ static void b43_interrupt_tasklet(struct b43_wldev *dev) dma_reason[2], dma_reason[3], dma_reason[4], dma_reason[5]); b43_controller_restart(dev, "DMA error"); - mmiowb(); - spin_unlock_irqrestore(&dev->wl->irq_lock, flags); return; } if (merged_dma_reason & B43_DMAIRQ_NONFATALMASK) { @@ -1867,47 +1874,36 @@ static void b43_interrupt_tasklet(struct b43_wldev *dev) if (reason & B43_IRQ_TX_OK) handle_irq_transmit_status(dev); + /* Re-enable interrupts on the device by restoring the current interrupt mask. */ b43_write32(dev, B43_MMIO_GEN_IRQ_MASK, dev->irq_mask); - mmiowb(); - spin_unlock_irqrestore(&dev->wl->irq_lock, flags); } -static void b43_interrupt_ack(struct b43_wldev *dev, u32 reason) +/* Interrupt thread handler. Handles device interrupts in thread context. */ +static irqreturn_t b43_interrupt_thread_handler(int irq, void *dev_id) { - b43_write32(dev, B43_MMIO_GEN_IRQ_REASON, reason); + struct b43_wldev *dev = dev_id; - b43_write32(dev, B43_MMIO_DMA0_REASON, dev->dma_reason[0]); - b43_write32(dev, B43_MMIO_DMA1_REASON, dev->dma_reason[1]); - b43_write32(dev, B43_MMIO_DMA2_REASON, dev->dma_reason[2]); - b43_write32(dev, B43_MMIO_DMA3_REASON, dev->dma_reason[3]); - b43_write32(dev, B43_MMIO_DMA4_REASON, dev->dma_reason[4]); -/* Unused ring - b43_write32(dev, B43_MMIO_DMA5_REASON, dev->dma_reason[5]); -*/ + mutex_lock(&dev->wl->mutex); + b43_do_interrupt_thread(dev); + mmiowb(); + mutex_unlock(&dev->wl->mutex); + + return IRQ_HANDLED; } -/* Interrupt handler top-half */ -static irqreturn_t b43_interrupt_handler(int irq, void *dev_id) +static irqreturn_t b43_do_interrupt(struct b43_wldev *dev) { - irqreturn_t ret = IRQ_NONE; - struct b43_wldev *dev = dev_id; u32 reason; - B43_WARN_ON(!dev); + /* This code runs under wl->hardirq_lock, but _only_ on non-SDIO busses. + * On SDIO, this runs under wl->mutex. */ - spin_lock(&dev->wl->irq_lock); - - if (unlikely(b43_status(dev) < B43_STAT_STARTED)) { - /* This can only happen on shared IRQ lines. */ - goto out; - } reason = b43_read32(dev, B43_MMIO_GEN_IRQ_REASON); if (reason == 0xffffffff) /* shared IRQ */ - goto out; - ret = IRQ_HANDLED; + return IRQ_NONE; reason &= dev->irq_mask; if (!reason) - goto out; + return IRQ_HANDLED; dev->dma_reason[0] = b43_read32(dev, B43_MMIO_DMA0_REASON) & 0x0001DC00; @@ -1924,15 +1920,38 @@ static irqreturn_t b43_interrupt_handler(int irq, void *dev_id) & 0x0000DC00; */ - b43_interrupt_ack(dev, reason); - /* disable all IRQs. They are enabled again in the bottom half. */ + /* ACK the interrupt. */ + b43_write32(dev, B43_MMIO_GEN_IRQ_REASON, reason); + b43_write32(dev, B43_MMIO_DMA0_REASON, dev->dma_reason[0]); + b43_write32(dev, B43_MMIO_DMA1_REASON, dev->dma_reason[1]); + b43_write32(dev, B43_MMIO_DMA2_REASON, dev->dma_reason[2]); + b43_write32(dev, B43_MMIO_DMA3_REASON, dev->dma_reason[3]); + b43_write32(dev, B43_MMIO_DMA4_REASON, dev->dma_reason[4]); +/* Unused ring + b43_write32(dev, B43_MMIO_DMA5_REASON, dev->dma_reason[5]); +*/ + + /* Disable IRQs on the device. The IRQ thread handler will re-enable them. */ b43_write32(dev, B43_MMIO_GEN_IRQ_MASK, 0); - /* save the reason code and call our bottom half. */ + /* Save the reason bitmasks for the IRQ thread handler. */ dev->irq_reason = reason; - tasklet_schedule(&dev->isr_tasklet); -out: + + return IRQ_WAKE_THREAD; +} + +/* Interrupt handler top-half. This runs with interrupts disabled. */ +static irqreturn_t b43_interrupt_handler(int irq, void *dev_id) +{ + struct b43_wldev *dev = dev_id; + irqreturn_t ret; + + if (unlikely(b43_status(dev) < B43_STAT_STARTED)) + return IRQ_NONE; + + spin_lock(&dev->wl->hardirq_lock); + ret = b43_do_interrupt(dev); mmiowb(); - spin_unlock(&dev->wl->irq_lock); + spin_unlock(&dev->wl->hardirq_lock); return ret; } @@ -3038,15 +3057,12 @@ static void b43_security_init(struct b43_wldev *dev) static int b43_rng_read(struct hwrng *rng, u32 *data) { struct b43_wl *wl = (struct b43_wl *)rng->priv; - unsigned long flags; - /* Don't take wl->mutex here, as it could deadlock with - * hwrng internal locking. It's not needed to take - * wl->mutex here, anyway. */ + /* FIXME: We need to take wl->mutex here to make sure the device + * is not going away from under our ass. However it could deadlock + * with hwrng internal locking. */ - spin_lock_irqsave(&wl->irq_lock, flags); *data = b43_read16(wl->current_dev, B43_MMIO_RNG); - spin_unlock_irqrestore(&wl->irq_lock, flags); return (sizeof(u16)); } @@ -3283,22 +3299,20 @@ static int b43_op_get_tx_stats(struct ieee80211_hw *hw, struct ieee80211_tx_queue_stats *stats) { struct b43_wl *wl = hw_to_b43_wl(hw); - struct b43_wldev *dev = wl->current_dev; - unsigned long flags; + struct b43_wldev *dev; int err = -ENODEV; - if (!dev) - goto out; - spin_lock_irqsave(&wl->irq_lock, flags); - if (likely(b43_status(dev) >= B43_STAT_STARTED)) { + mutex_lock(&wl->mutex); + dev = wl->current_dev; + if (dev && b43_status(dev) >= B43_STAT_STARTED) { if (b43_using_pio_transfers(dev)) b43_pio_get_tx_stats(dev, stats); else b43_dma_get_tx_stats(dev, stats); err = 0; } - spin_unlock_irqrestore(&wl->irq_lock, flags); -out: + mutex_unlock(&wl->mutex); + return err; } @@ -3306,11 +3320,10 @@ static int b43_op_get_stats(struct ieee80211_hw *hw, struct ieee80211_low_level_stats *stats) { struct b43_wl *wl = hw_to_b43_wl(hw); - unsigned long flags; - spin_lock_irqsave(&wl->irq_lock, flags); + mutex_lock(&wl->mutex); memcpy(stats, &wl->ieee_stats, sizeof(*stats)); - spin_unlock_irqrestore(&wl->irq_lock, flags); + mutex_unlock(&wl->mutex); return 0; } @@ -3322,7 +3335,6 @@ static u64 b43_op_get_tsf(struct ieee80211_hw *hw) u64 tsf; mutex_lock(&wl->mutex); - spin_lock_irq(&wl->irq_lock); dev = wl->current_dev; if (dev && (b43_status(dev) >= B43_STAT_INITIALIZED)) @@ -3330,7 +3342,6 @@ static u64 b43_op_get_tsf(struct ieee80211_hw *hw) else tsf = 0; - spin_unlock_irq(&wl->irq_lock); mutex_unlock(&wl->mutex); return tsf; @@ -3342,13 +3353,11 @@ static void b43_op_set_tsf(struct ieee80211_hw *hw, u64 tsf) struct b43_wldev *dev; mutex_lock(&wl->mutex); - spin_lock_irq(&wl->irq_lock); dev = wl->current_dev; if (dev && (b43_status(dev) >= B43_STAT_INITIALIZED)) b43_tsf_write(dev, tsf); - spin_unlock_irq(&wl->irq_lock); mutex_unlock(&wl->mutex); } @@ -3434,7 +3443,7 @@ static int b43_switch_band(struct b43_wl *wl, struct ieee80211_channel *chan) prev_status = b43_status(down_dev); /* Shutdown the currently running core. */ if (prev_status >= B43_STAT_STARTED) - b43_wireless_core_stop(down_dev); + down_dev = b43_wireless_core_stop(down_dev); if (prev_status >= B43_STAT_INITIALIZED) b43_wireless_core_exit(down_dev); @@ -3498,7 +3507,6 @@ static int b43_op_config(struct ieee80211_hw *hw, u32 changed) struct b43_wldev *dev; struct b43_phy *phy; struct ieee80211_conf *conf = &hw->conf; - unsigned long flags; int antenna; int err = 0; @@ -3529,13 +3537,11 @@ static int b43_op_config(struct ieee80211_hw *hw, u32 changed) /* Adjust the desired TX power level. */ if (conf->power_level != 0) { - spin_lock_irqsave(&wl->irq_lock, flags); if (conf->power_level != phy->desired_txpower) { phy->desired_txpower = conf->power_level; b43_phy_txpower_check(dev, B43_TXPWR_IGNORE_TIME | B43_TXPWR_IGNORE_TSSI); } - spin_unlock_irqrestore(&wl->irq_lock, flags); } /* Antennas for RX and management frame TX. */ @@ -3620,7 +3626,6 @@ static void b43_op_bss_info_changed(struct ieee80211_hw *hw, { struct b43_wl *wl = hw_to_b43_wl(hw); struct b43_wldev *dev; - unsigned long flags; mutex_lock(&wl->mutex); @@ -3630,7 +3635,6 @@ static void b43_op_bss_info_changed(struct ieee80211_hw *hw, B43_WARN_ON(wl->vif != vif); - spin_lock_irqsave(&wl->irq_lock, flags); if (changed & BSS_CHANGED_BSSID) { if (conf->bssid) memcpy(wl->bssid, conf->bssid, ETH_ALEN); @@ -3648,7 +3652,6 @@ static void b43_op_bss_info_changed(struct ieee80211_hw *hw, if (changed & BSS_CHANGED_BSSID) b43_write_mac_bssid_templates(dev); } - spin_unlock_irqrestore(&wl->irq_lock, flags); b43_mac_suspend(dev); @@ -3683,18 +3686,15 @@ static int b43_op_set_key(struct ieee80211_hw *hw, enum set_key_cmd cmd, u8 algorithm; u8 index; int err; + unsigned long flags; static const u8 bcast_addr[ETH_ALEN] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; if (modparam_nohwcrypt) return -ENOSPC; /* User disabled HW-crypto */ mutex_lock(&wl->mutex); - spin_lock_irq(&wl->irq_lock); - write_lock(&wl->tx_lock); - /* Why do we need all this locking here? - * mutex -> Every config operation must take it. - * irq_lock -> We modify the dev->key array, which is accessed - * in the IRQ handlers. + write_lock_irqsave(&wl->tx_lock, flags); + /* mutex -> Every config operation must take it. * tx_lock -> We modify the dev->key array, which is accessed * in the TX handler. */ @@ -3789,8 +3789,7 @@ out_unlock: sta ? sta->addr : bcast_addr); b43_dump_keymemory(dev); } - write_unlock(&wl->tx_lock); - spin_unlock_irq(&wl->irq_lock); + write_unlock_irqrestore(&wl->tx_lock, flags); mutex_unlock(&wl->mutex); return err; @@ -3801,15 +3800,15 @@ static void b43_op_configure_filter(struct ieee80211_hw *hw, u64 multicast) { struct b43_wl *wl = hw_to_b43_wl(hw); - struct b43_wldev *dev = wl->current_dev; - unsigned long flags; + struct b43_wldev *dev; + mutex_lock(&wl->mutex); + dev = wl->current_dev; if (!dev) { *fflags = 0; - return; + goto out_unlock; } - spin_lock_irqsave(&wl->irq_lock, flags); *fflags &= FIF_PROMISC_IN_BSS | FIF_ALLMULTI | FIF_FCSFAIL | @@ -3830,41 +3829,66 @@ static void b43_op_configure_filter(struct ieee80211_hw *hw, if (changed && b43_status(dev) >= B43_STAT_INITIALIZED) b43_adjust_opmode(dev); - spin_unlock_irqrestore(&wl->irq_lock, flags); + +out_unlock: + mutex_unlock(&wl->mutex); } -/* Locking: wl->mutex */ -static void b43_wireless_core_stop(struct b43_wldev *dev) +/* Locking: wl->mutex + * Returns the current dev. This might be different from the passed in dev, + * because the core might be gone away while we unlocked the mutex. */ +static struct b43_wldev * b43_wireless_core_stop(struct b43_wldev *dev) { struct b43_wl *wl = dev->wl; - unsigned long flags; + struct b43_wldev *orig_dev; - if (b43_status(dev) < B43_STAT_STARTED) - return; +redo: + if (!dev || b43_status(dev) < B43_STAT_STARTED) + return dev; - /* Disable and sync interrupts. We must do this before than - * setting the status to INITIALIZED, as the interrupt handler - * won't care about IRQs then. */ - spin_lock_irqsave(&wl->irq_lock, flags); - b43_write32(dev, B43_MMIO_GEN_IRQ_MASK, 0); - b43_read32(dev, B43_MMIO_GEN_IRQ_MASK); /* flush */ - spin_unlock_irqrestore(&wl->irq_lock, flags); - b43_synchronize_irq(dev); + /* Disable periodic work. Unlock to avoid deadlocks. */ + mutex_unlock(&wl->mutex); + cancel_delayed_work_sync(&dev->periodic_work); + mutex_lock(&wl->mutex); + dev = wl->current_dev; + if (!dev || b43_status(dev) < B43_STAT_STARTED) { + /* Whoops, aliens ate up the device while we were unlocked. */ + return dev; + } - write_lock_irqsave(&wl->tx_lock, flags); + /* Disable interrupts on the device. */ b43_set_status(dev, B43_STAT_INITIALIZED); - write_unlock_irqrestore(&wl->tx_lock, flags); - - b43_pio_stop(dev); + if (0 /*FIXME dev->dev->bus->bustype == SSB_BUSTYPE_SDIO*/) { + /* wl->mutex is locked. That is enough. */ + b43_write32(dev, B43_MMIO_GEN_IRQ_MASK, 0); + b43_read32(dev, B43_MMIO_GEN_IRQ_MASK); /* Flush */ + } else { + spin_lock_irq(&wl->hardirq_lock); + b43_write32(dev, B43_MMIO_GEN_IRQ_MASK, 0); + b43_read32(dev, B43_MMIO_GEN_IRQ_MASK); /* Flush */ + spin_unlock_irq(&wl->hardirq_lock); + } + /* Synchronize the interrupt handlers. Unlock to avoid deadlocks. */ + orig_dev = dev; mutex_unlock(&wl->mutex); - /* Must unlock as it would otherwise deadlock. No races here. - * Cancel the possibly running self-rearming periodic work. */ - cancel_delayed_work_sync(&dev->periodic_work); + synchronize_irq(dev->dev->irq); mutex_lock(&wl->mutex); + dev = wl->current_dev; + if (!dev) + return dev; + if (dev != orig_dev) { + if (b43_status(dev) >= B43_STAT_STARTED) + goto redo; + return dev; + } + B43_WARN_ON(b43_read32(dev, B43_MMIO_GEN_IRQ_MASK)); + b43_pio_stop(dev); b43_mac_suspend(dev); free_irq(dev->dev->irq, dev); b43dbg(wl, "Wireless interface stopped\n"); + + return dev; } /* Locking: wl->mutex */ @@ -3875,8 +3899,9 @@ static int b43_wireless_core_start(struct b43_wldev *dev) B43_WARN_ON(b43_status(dev) != B43_STAT_INITIALIZED); drain_txstatus_queue(dev); - err = request_irq(dev->dev->irq, b43_interrupt_handler, - IRQF_SHARED, KBUILD_MODNAME, dev); + err = request_threaded_irq(dev->dev->irq, b43_interrupt_handler, + b43_interrupt_thread_handler, + IRQF_SHARED, KBUILD_MODNAME, dev); if (err) { b43err(dev->wl, "Cannot request IRQ-%d\n", dev->dev->irq); goto out; @@ -4155,8 +4180,8 @@ static void b43_wireless_core_exit(struct b43_wldev *dev) { u32 macctl; - B43_WARN_ON(b43_status(dev) > B43_STAT_INITIALIZED); - if (b43_status(dev) != B43_STAT_INITIALIZED) + B43_WARN_ON(dev && b43_status(dev) > B43_STAT_INITIALIZED); + if (!dev || b43_status(dev) != B43_STAT_INITIALIZED) return; b43_set_status(dev, B43_STAT_UNINIT); @@ -4309,7 +4334,6 @@ static int b43_op_add_interface(struct ieee80211_hw *hw, { struct b43_wl *wl = hw_to_b43_wl(hw); struct b43_wldev *dev; - unsigned long flags; int err = -EOPNOTSUPP; /* TODO: allow WDS/AP devices to coexist */ @@ -4333,12 +4357,10 @@ static int b43_op_add_interface(struct ieee80211_hw *hw, wl->if_type = conf->type; memcpy(wl->mac_addr, conf->mac_addr, ETH_ALEN); - spin_lock_irqsave(&wl->irq_lock, flags); b43_adjust_opmode(dev); b43_set_pretbtt(dev); b43_set_synth_pu_delay(dev, 0); b43_upload_card_macaddress(dev); - spin_unlock_irqrestore(&wl->irq_lock, flags); err = 0; out_mutex_unlock: @@ -4352,7 +4374,6 @@ static void b43_op_remove_interface(struct ieee80211_hw *hw, { struct b43_wl *wl = hw_to_b43_wl(hw); struct b43_wldev *dev = wl->current_dev; - unsigned long flags; b43dbg(wl, "Removing Interface type %d\n", conf->type); @@ -4364,11 +4385,9 @@ static void b43_op_remove_interface(struct ieee80211_hw *hw, wl->operating = 0; - spin_lock_irqsave(&wl->irq_lock, flags); b43_adjust_opmode(dev); memset(wl->mac_addr, 0, ETH_ALEN); b43_upload_card_macaddress(dev); - spin_unlock_irqrestore(&wl->irq_lock, flags); mutex_unlock(&wl->mutex); } @@ -4428,10 +4447,15 @@ static void b43_op_stop(struct ieee80211_hw *hw) cancel_work_sync(&(wl->beacon_update_trigger)); mutex_lock(&wl->mutex); - if (b43_status(dev) >= B43_STAT_STARTED) - b43_wireless_core_stop(dev); + if (b43_status(dev) >= B43_STAT_STARTED) { + dev = b43_wireless_core_stop(dev); + if (!dev) + goto out_unlock; + } b43_wireless_core_exit(dev); wl->radio_enabled = 0; + +out_unlock: mutex_unlock(&wl->mutex); cancel_work_sync(&(wl->txpower_adjust_work)); @@ -4441,11 +4465,10 @@ static int b43_op_beacon_set_tim(struct ieee80211_hw *hw, struct ieee80211_sta *sta, bool set) { struct b43_wl *wl = hw_to_b43_wl(hw); - unsigned long flags; - spin_lock_irqsave(&wl->irq_lock, flags); + mutex_lock(&wl->mutex); b43_update_templates(wl); - spin_unlock_irqrestore(&wl->irq_lock, flags); + mutex_unlock(&wl->mutex); return 0; } @@ -4526,8 +4549,13 @@ static void b43_chip_reset(struct work_struct *work) prev_status = b43_status(dev); /* Bring the device down... */ - if (prev_status >= B43_STAT_STARTED) - b43_wireless_core_stop(dev); + if (prev_status >= B43_STAT_STARTED) { + dev = b43_wireless_core_stop(dev); + if (!dev) { + err = -ENODEV; + goto out; + } + } if (prev_status >= B43_STAT_INITIALIZED) b43_wireless_core_exit(dev); @@ -4742,9 +4770,6 @@ static int b43_one_core_attach(struct ssb_device *dev, struct b43_wl *wl) wldev->wl = wl; b43_set_status(wldev, B43_STAT_UNINIT); wldev->bad_frames_preempt = modparam_bad_frames_preempt; - tasklet_init(&wldev->isr_tasklet, - (void (*)(unsigned long))b43_interrupt_tasklet, - (unsigned long)wldev); INIT_LIST_HEAD(&wldev->list); err = b43_wireless_core_attach(wldev); @@ -4841,11 +4866,11 @@ static int b43_wireless_init(struct ssb_device *dev) /* Initialize struct b43_wl */ wl->hw = hw; - spin_lock_init(&wl->irq_lock); rwlock_init(&wl->tx_lock); spin_lock_init(&wl->leds_lock); spin_lock_init(&wl->shm_lock); mutex_init(&wl->mutex); + spin_lock_init(&wl->hardirq_lock); INIT_LIST_HEAD(&wl->devlist); INIT_WORK(&wl->beacon_update_trigger, b43_beacon_update_trigger_work); INIT_WORK(&wl->txpower_adjust_work, b43_phy_txpower_adjust_work); @@ -4946,8 +4971,8 @@ static int b43_suspend(struct ssb_device *dev, pm_message_t state) wldev->suspend_in_progress = true; wldev->suspend_init_status = b43_status(wldev); if (wldev->suspend_init_status >= B43_STAT_STARTED) - b43_wireless_core_stop(wldev); - if (wldev->suspend_init_status >= B43_STAT_INITIALIZED) + wldev = b43_wireless_core_stop(wldev); + if (wldev && wldev->suspend_init_status >= B43_STAT_INITIALIZED) b43_wireless_core_exit(wldev); mutex_unlock(&wl->mutex); diff --git a/drivers/net/wireless/b43/phy_common.c b/drivers/net/wireless/b43/phy_common.c index 6e704becda6..75b26e175e8 100644 --- a/drivers/net/wireless/b43/phy_common.c +++ b/drivers/net/wireless/b43/phy_common.c @@ -347,7 +347,6 @@ void b43_phy_txpower_adjust_work(struct work_struct *work) mutex_unlock(&wl->mutex); } -/* Called with wl->irq_lock locked */ void b43_phy_txpower_check(struct b43_wldev *dev, unsigned int flags) { struct b43_phy *phy = &dev->phy; diff --git a/drivers/net/wireless/b43/phy_common.h b/drivers/net/wireless/b43/phy_common.h index 28e384633c3..9edd4e8e0c8 100644 --- a/drivers/net/wireless/b43/phy_common.h +++ b/drivers/net/wireless/b43/phy_common.h @@ -131,7 +131,7 @@ enum b43_txpwr_result { * If the parameter "ignore_tssi" is true, the TSSI values should * be ignored and a recalculation of the power settings should be * done even if the TSSI values did not change. - * This callback is called with wl->irq_lock held and must not sleep. + * This function may sleep, but should not. * Must not be NULL. * @adjust_txpower: Write the previously calculated TX power settings * (from @recalc_txpower) to the hardware. @@ -379,7 +379,6 @@ void b43_software_rfkill(struct b43_wldev *dev, bool blocked); * * Compare the current TX power output to the desired power emission * and schedule an adjustment in case it mismatches. - * Requires wl->irq_lock locked. * * @flags: OR'ed enum b43_phy_txpower_check_flags flags. * See the docs below. diff --git a/drivers/net/wireless/b43/phy_g.c b/drivers/net/wireless/b43/phy_g.c index 5afa4df0b02..382826a8da8 100644 --- a/drivers/net/wireless/b43/phy_g.c +++ b/drivers/net/wireless/b43/phy_g.c @@ -2823,8 +2823,6 @@ static void b43_gphy_op_adjust_txpower(struct b43_wldev *dev) b43_mac_suspend(dev); - spin_lock_irq(&dev->wl->irq_lock); - /* Calculate the new attenuation values. */ bbatt = gphy->bbatt.att; bbatt += gphy->bbatt_delta; @@ -2864,11 +2862,6 @@ static void b43_gphy_op_adjust_txpower(struct b43_wldev *dev) gphy->rfatt.att = rfatt; gphy->bbatt.att = bbatt; - /* We drop the lock early, so we can sleep during hardware - * adjustment. Possible races with op_recalc_txpower are harmless, - * as we will be called once again in case we raced. */ - spin_unlock_irq(&dev->wl->irq_lock); - if (b43_debug(dev, B43_DBG_XMITPOWER)) b43dbg(dev->wl, "Adjusting TX power\n"); diff --git a/drivers/net/wireless/b43/phy_g.h b/drivers/net/wireless/b43/phy_g.h index 718947fd41a..8569fdd4c6b 100644 --- a/drivers/net/wireless/b43/phy_g.h +++ b/drivers/net/wireless/b43/phy_g.h @@ -141,8 +141,7 @@ struct b43_phy_g { int tgt_idle_tssi; /* Current idle TSSI */ int cur_idle_tssi; - /* The current average TSSI. - * Needs irq_lock, as it's updated in the IRQ path. */ + /* The current average TSSI. */ u8 average_tssi; /* Current TX power level attenuation control values */ struct b43_bbatt bbatt; diff --git a/drivers/net/wireless/b43/pio.c b/drivers/net/wireless/b43/pio.c index 3fd653c78b1..ce6f36eb88c 100644 --- a/drivers/net/wireless/b43/pio.c +++ b/drivers/net/wireless/b43/pio.c @@ -570,7 +570,6 @@ out_unlock: return err; } -/* Called with IRQs disabled. */ void b43_pio_handle_txstatus(struct b43_wldev *dev, const struct b43_txstatus *status) { @@ -584,7 +583,7 @@ void b43_pio_handle_txstatus(struct b43_wldev *dev, return; B43_WARN_ON(!pack); - spin_lock(&q->lock); /* IRQs are already disabled. */ + spin_lock_irq(&q->lock); info = IEEE80211_SKB_CB(pack->skb); @@ -604,7 +603,7 @@ void b43_pio_handle_txstatus(struct b43_wldev *dev, q->stopped = 0; } - spin_unlock(&q->lock); + spin_unlock_irq(&q->lock); } void b43_pio_get_tx_stats(struct b43_wldev *dev, diff --git a/drivers/net/wireless/b43/sysfs.c b/drivers/net/wireless/b43/sysfs.c index 5adaa3692d7..f1ae4e05a32 100644 --- a/drivers/net/wireless/b43/sysfs.c +++ b/drivers/net/wireless/b43/sysfs.c @@ -94,7 +94,6 @@ static ssize_t b43_attr_interfmode_store(struct device *dev, const char *buf, size_t count) { struct b43_wldev *wldev = dev_to_b43_wldev(dev); - unsigned long flags; int err; int mode; @@ -120,7 +119,6 @@ static ssize_t b43_attr_interfmode_store(struct device *dev, } mutex_lock(&wldev->wl->mutex); - spin_lock_irqsave(&wldev->wl->irq_lock, flags); if (wldev->phy.ops->interf_mitigation) { err = wldev->phy.ops->interf_mitigation(wldev, mode); @@ -132,7 +130,6 @@ static ssize_t b43_attr_interfmode_store(struct device *dev, err = -ENOSYS; mmiowb(); - spin_unlock_irqrestore(&wldev->wl->irq_lock, flags); mutex_unlock(&wldev->wl->mutex); return err ? err : count; |