On Sat, 2005-11-26 at 20:44 -0600, Larry Finger wrote:
> I am trying to help the bcm43xx project develop a driver for the
> Broadcom 43xx wireless chips, using my Linksys WPC54G card.
> Unfortunately, since the group got far enough to turn on RX DMA, my
> system has frozen whenever I load the driver. TX DMA was OK. It seems to
> correlate with the receipt of a beacon from my AP, but that cannot be
> proven. When the freeze happens, I cannot do anything more and have to
> power the system off.
>
> What should I consider as a cause of the freeze? I have reviewed the
> code and do not find any obvious out-of-bounds memory references. I have
> tried various 'printk' statements, but none of them in the bottom-half
> interrupt routine make it to the logs. Are there any tricks that I
> should try?
spinlock debugging is one... if it's a bad DMA to low memory, you can't
do much. Another common cause is a stale interrupt, is your IRQ handler
called over & over again in a loop ?
The problem is that depending on what you are interrupting, printk may
not work ...
Ben.
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