[lkml]   [2006]   [Sep]   [22]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
Patch in this message
SubjectRe: Bcm43xx softMac Driver in 2.6.18
When we found the cause of NETDEV watchdog timeouts in the wireless-2.6 code, I knew that the 2.6.18 
release code would cause a serious regression. I immediately prepared and tested a patch to fix
this; however, I was unable to get it pushed into the stable code before release of 2.6.18. The
following submission text and patch has been sent to the stable maintainers, which I hope is
included in

For people having these lockups with 2.6.18, please try this patch and inform me of the results,
both positive and negative. The latter are particularly important.


In 2.6.18, the section that prepares for preemptible periodic work
has two bugs. The first is due to an improper locking sequence that leads
to frozen systems. The second causes netdev watchdog timeouts. Both
lead to serious regressions as compared with 2.6.17.

Signed-off-by: Larry Finger <>

This patch, which was originally sent to John Linville on 9/14/06,
has been taken against 2.6.18. It changes more lines
than would be absolutely necessary to affect the fix; however, it
ends up with this section looking exactly like the current code (with
pending patches) that is in wireless-2.6.


Index: linux-2.6/drivers/net/wireless/bcm43xx/bcm43xx_main.c
--- linux-2.6.orig/drivers/net/wireless/bcm43xx/bcm43xx_main.c
+++ linux-2.6/drivers/net/wireless/bcm43xx/bcm43xx_main.c
@@ -3182,39 +3182,37 @@ static void bcm43xx_periodic_work_handle
/* Periodic work will take a long time, so we want it to
* be preemtible.
- bcm43xx_lock_irqonly(bcm, flags);
- netif_stop_queue(bcm->net_dev);
+ mutex_lock(&bcm->mutex);
+ netif_tx_disable(bcm->net_dev);
+ spin_lock_irqsave(&bcm->irq_lock, flags);
+ bcm43xx_mac_suspend(bcm);
if (bcm43xx_using_pio(bcm))
savedirqs = bcm43xx_interrupt_disable(bcm, BCM43xx_IRQ_ALL);
- bcm43xx_unlock_irqonly(bcm, flags);
- bcm43xx_lock_noirq(bcm);
+ spin_unlock_irqrestore(&bcm->irq_lock, flags);
} else {
/* Periodic work should take short time, so we want low
* locking overhead.
- bcm43xx_lock_irqsafe(bcm, flags);
+ mutex_lock(&bcm->mutex);
+ spin_lock_irqsave(&bcm->irq_lock, flags);


if (badness > BADNESS_LIMIT) {
- bcm43xx_lock_irqonly(bcm, flags);
- if (likely(bcm43xx_status(bcm) == BCM43xx_STAT_INITIALIZED)) {
- tasklet_enable(&bcm->isr_tasklet);
- bcm43xx_interrupt_enable(bcm, savedirqs);
- if (bcm43xx_using_pio(bcm))
- bcm43xx_pio_thaw_txqueues(bcm);
- }
+ spin_lock_irqsave(&bcm->irq_lock, flags);
+ tasklet_enable(&bcm->isr_tasklet);
+ bcm43xx_interrupt_enable(bcm, savedirqs);
+ if (bcm43xx_using_pio(bcm))
+ bcm43xx_pio_thaw_txqueues(bcm);
+ bcm43xx_mac_enable(bcm);
- mmiowb();
- bcm43xx_unlock_irqonly(bcm, flags);
- bcm43xx_unlock_noirq(bcm);
- } else {
- mmiowb();
- bcm43xx_unlock_irqsafe(bcm, flags);
+ mmiowb();
+ spin_unlock_irqrestore(&bcm->irq_lock, flags);
+ mutex_unlock(&bcm->mutex);

static void bcm43xx_periodic_tasks_delete(struct bcm43xx_private *bcm)

Bcm43xx-dev mailing list

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

 \ /
  Last update: 2006-09-22 15:23    [W:0.052 / U:12.520 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site