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Merge branch 'upstream' of git://git.kernel.org/pub/scm/linux/kernel/…
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…git/linville/wireless-2.6 into upstream
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Jeff Garzik committed Jul 19, 2006
2 parents 3fac061 + dd2f553 commit 225ec70
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Showing 9 changed files with 215 additions and 192 deletions.
64 changes: 14 additions & 50 deletions drivers/net/wireless/bcm43xx/bcm43xx.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -649,6 +649,19 @@ enum {
#define bcm43xx_status(bcm) atomic_read(&(bcm)->init_status)
#define bcm43xx_set_status(bcm, stat) atomic_set(&(bcm)->init_status, (stat))

/* *** THEORY OF LOCKING ***
*
* We have two different locks in the bcm43xx driver.
* => bcm->mutex: General sleeping mutex. Protects struct bcm43xx_private
* and the device registers. This mutex does _not_ protect
* against concurrency from the IRQ handler.
* => bcm->irq_lock: IRQ spinlock. Protects against IRQ handler concurrency.
*
* Please note that, if you only take the irq_lock, you are not protected
* against concurrency from the periodic work handlers.
* Most times you want to take _both_ locks.
*/

struct bcm43xx_private {
struct ieee80211_device *ieee;
struct ieee80211softmac_device *softmac;
Expand All @@ -659,7 +672,6 @@ struct bcm43xx_private {

void __iomem *mmio_addr;

/* Locking, see "theory of locking" text below. */
spinlock_t irq_lock;
struct mutex mutex;

Expand Down Expand Up @@ -691,6 +703,7 @@ struct bcm43xx_private {
struct bcm43xx_sprominfo sprom;
#define BCM43xx_NR_LEDS 4
struct bcm43xx_led leds[BCM43xx_NR_LEDS];
spinlock_t leds_lock;

/* The currently active core. */
struct bcm43xx_coreinfo *current_core;
Expand Down Expand Up @@ -763,55 +776,6 @@ struct bcm43xx_private {
};


/* *** THEORY OF LOCKING ***
*
* We have two different locks in the bcm43xx driver.
* => bcm->mutex: General sleeping mutex. Protects struct bcm43xx_private
* and the device registers.
* => bcm->irq_lock: IRQ spinlock. Protects against IRQ handler concurrency.
*
* We have three types of helper function pairs to utilize these locks.
* (Always use the helper functions.)
* 1) bcm43xx_{un}lock_noirq():
* Takes bcm->mutex. Does _not_ protect against IRQ concurrency,
* so it is almost always unsafe, if device IRQs are enabled.
* So only use this, if device IRQs are masked.
* Locking may sleep.
* You can sleep within the critical section.
* 2) bcm43xx_{un}lock_irqonly():
* Takes bcm->irq_lock. Does _not_ protect against
* bcm43xx_lock_noirq() critical sections.
* Does only protect against the IRQ handler path and other
* irqonly() critical sections.
* Locking does not sleep.
* You must not sleep within the critical section.
* 3) bcm43xx_{un}lock_irqsafe():
* This is the cummulative lock and takes both, mutex and irq_lock.
* Protects against noirq() and irqonly() critical sections (and
* the IRQ handler path).
* Locking may sleep.
* You must not sleep within the critical section.
*/

/* Lock type 1 */
#define bcm43xx_lock_noirq(bcm) mutex_lock(&(bcm)->mutex)
#define bcm43xx_unlock_noirq(bcm) mutex_unlock(&(bcm)->mutex)
/* Lock type 2 */
#define bcm43xx_lock_irqonly(bcm, flags) \
spin_lock_irqsave(&(bcm)->irq_lock, flags)
#define bcm43xx_unlock_irqonly(bcm, flags) \
spin_unlock_irqrestore(&(bcm)->irq_lock, flags)
/* Lock type 3 */
#define bcm43xx_lock_irqsafe(bcm, flags) do { \
bcm43xx_lock_noirq(bcm); \
bcm43xx_lock_irqonly(bcm, flags); \
} while (0)
#define bcm43xx_unlock_irqsafe(bcm, flags) do { \
bcm43xx_unlock_irqonly(bcm, flags); \
bcm43xx_unlock_noirq(bcm); \
} while (0)


static inline
struct bcm43xx_private * bcm43xx_priv(struct net_device *dev)
{
Expand Down
34 changes: 22 additions & 12 deletions drivers/net/wireless/bcm43xx/bcm43xx_debugfs.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -77,7 +77,8 @@ static ssize_t devinfo_read_file(struct file *file, char __user *userbuf,

down(&big_buffer_sem);

bcm43xx_lock_irqsafe(bcm, flags);
mutex_lock(&bcm->mutex);
spin_lock_irqsave(&bcm->irq_lock, flags);
if (bcm43xx_status(bcm) != BCM43xx_STAT_INITIALIZED) {
fappend("Board not initialized.\n");
goto out;
Expand Down Expand Up @@ -121,7 +122,8 @@ static ssize_t devinfo_read_file(struct file *file, char __user *userbuf,
fappend("\n");

out:
bcm43xx_unlock_irqsafe(bcm, flags);
spin_unlock_irqrestore(&bcm->irq_lock, flags);
mutex_unlock(&bcm->mutex);
res = simple_read_from_buffer(userbuf, count, ppos, buf, pos);
up(&big_buffer_sem);
return res;
Expand Down Expand Up @@ -159,7 +161,8 @@ static ssize_t spromdump_read_file(struct file *file, char __user *userbuf,
unsigned long flags;

down(&big_buffer_sem);
bcm43xx_lock_irqsafe(bcm, flags);
mutex_lock(&bcm->mutex);
spin_lock_irqsave(&bcm->irq_lock, flags);
if (bcm43xx_status(bcm) != BCM43xx_STAT_INITIALIZED) {
fappend("Board not initialized.\n");
goto out;
Expand All @@ -169,7 +172,8 @@ static ssize_t spromdump_read_file(struct file *file, char __user *userbuf,
fappend("boardflags: 0x%04x\n", bcm->sprom.boardflags);

out:
bcm43xx_unlock_irqsafe(bcm, flags);
spin_unlock_irqrestore(&bcm->irq_lock, flags);
mutex_unlock(&bcm->mutex);
res = simple_read_from_buffer(userbuf, count, ppos, buf, pos);
up(&big_buffer_sem);
return res;
Expand All @@ -188,7 +192,8 @@ static ssize_t tsf_read_file(struct file *file, char __user *userbuf,
u64 tsf;

down(&big_buffer_sem);
bcm43xx_lock_irqsafe(bcm, flags);
mutex_lock(&bcm->mutex);
spin_lock_irqsave(&bcm->irq_lock, flags);
if (bcm43xx_status(bcm) != BCM43xx_STAT_INITIALIZED) {
fappend("Board not initialized.\n");
goto out;
Expand All @@ -199,7 +204,8 @@ static ssize_t tsf_read_file(struct file *file, char __user *userbuf,
(unsigned int)(tsf & 0xFFFFFFFFULL));

out:
bcm43xx_unlock_irqsafe(bcm, flags);
spin_unlock_irqrestore(&bcm->irq_lock, flags);
mutex_unlock(&bcm->mutex);
res = simple_read_from_buffer(userbuf, count, ppos, buf, pos);
up(&big_buffer_sem);
return res;
Expand All @@ -221,7 +227,8 @@ static ssize_t tsf_write_file(struct file *file, const char __user *user_buf,
res = -EFAULT;
goto out_up;
}
bcm43xx_lock_irqsafe(bcm, flags);
mutex_lock(&bcm->mutex);
spin_lock_irqsave(&bcm->irq_lock, flags);
if (bcm43xx_status(bcm) != BCM43xx_STAT_INITIALIZED) {
printk(KERN_INFO PFX "debugfs: Board not initialized.\n");
res = -EFAULT;
Expand All @@ -237,7 +244,8 @@ static ssize_t tsf_write_file(struct file *file, const char __user *user_buf,
res = buf_size;

out_unlock:
bcm43xx_unlock_irqsafe(bcm, flags);
spin_unlock_irqrestore(&bcm->irq_lock, flags);
mutex_unlock(&bcm->mutex);
out_up:
up(&big_buffer_sem);
return res;
Expand All @@ -258,7 +266,8 @@ static ssize_t txstat_read_file(struct file *file, char __user *userbuf,
int i, cnt, j = 0;

down(&big_buffer_sem);
bcm43xx_lock_irqsafe(bcm, flags);
mutex_lock(&bcm->mutex);
spin_lock_irqsave(&bcm->irq_lock, flags);

fappend("Last %d logged xmitstatus blobs (Latest first):\n\n",
BCM43xx_NR_LOGGED_XMITSTATUS);
Expand Down Expand Up @@ -294,14 +303,15 @@ static ssize_t txstat_read_file(struct file *file, char __user *userbuf,
i = BCM43xx_NR_LOGGED_XMITSTATUS - 1;
}

bcm43xx_unlock_irqsafe(bcm, flags);
spin_unlock_irqrestore(&bcm->irq_lock, flags);
res = simple_read_from_buffer(userbuf, count, ppos, buf, pos);
bcm43xx_lock_irqsafe(bcm, flags);
spin_lock_irqsave(&bcm->irq_lock, flags);
if (*ppos == pos) {
/* Done. Drop the copied data. */
e->xmitstatus_printing = 0;
}
bcm43xx_unlock_irqsafe(bcm, flags);
spin_unlock_irqrestore(&bcm->irq_lock, flags);
mutex_unlock(&bcm->mutex);
up(&big_buffer_sem);
return res;
}
Expand Down
10 changes: 8 additions & 2 deletions drivers/net/wireless/bcm43xx/bcm43xx_leds.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -51,12 +51,12 @@ static void bcm43xx_led_blink(unsigned long d)
struct bcm43xx_private *bcm = led->bcm;
unsigned long flags;

bcm43xx_lock_irqonly(bcm, flags);
spin_lock_irqsave(&bcm->leds_lock, flags);
if (led->blink_interval) {
bcm43xx_led_changestate(led);
mod_timer(&led->blink_timer, jiffies + led->blink_interval);
}
bcm43xx_unlock_irqonly(bcm, flags);
spin_unlock_irqrestore(&bcm->leds_lock, flags);
}

static void bcm43xx_led_blink_start(struct bcm43xx_led *led,
Expand Down Expand Up @@ -177,7 +177,9 @@ void bcm43xx_leds_update(struct bcm43xx_private *bcm, int activity)
int i, turn_on;
unsigned long interval = 0;
u16 ledctl;
unsigned long flags;

spin_lock_irqsave(&bcm->leds_lock, flags);
ledctl = bcm43xx_read16(bcm, BCM43xx_MMIO_GPIO_CONTROL);
for (i = 0; i < BCM43xx_NR_LEDS; i++) {
led = &(bcm->leds[i]);
Expand Down Expand Up @@ -266,6 +268,7 @@ void bcm43xx_leds_update(struct bcm43xx_private *bcm, int activity)
ledctl &= ~(1 << i);
}
bcm43xx_write16(bcm, BCM43xx_MMIO_GPIO_CONTROL, ledctl);
spin_unlock_irqrestore(&bcm->leds_lock, flags);
}

void bcm43xx_leds_switch_all(struct bcm43xx_private *bcm, int on)
Expand All @@ -274,7 +277,9 @@ void bcm43xx_leds_switch_all(struct bcm43xx_private *bcm, int on)
u16 ledctl;
int i;
int bit_on;
unsigned long flags;

spin_lock_irqsave(&bcm->leds_lock, flags);
ledctl = bcm43xx_read16(bcm, BCM43xx_MMIO_GPIO_CONTROL);
for (i = 0; i < BCM43xx_NR_LEDS; i++) {
led = &(bcm->leds[i]);
Expand All @@ -290,4 +295,5 @@ void bcm43xx_leds_switch_all(struct bcm43xx_private *bcm, int on)
ledctl &= ~(1 << i);
}
bcm43xx_write16(bcm, BCM43xx_MMIO_GPIO_CONTROL, ledctl);
spin_unlock_irqrestore(&bcm->leds_lock, flags);
}
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