hw reset during high traffic load (was: talkative reset)

Jouni Malinen jkmaline at cc.hut.fi
Sun May 18 22:50:38 EDT 2003

On Sat, May 17, 2003 at 11:51:22PM -0700, Jouni Malinen wrote:
> On Thu, May 15, 2003 at 11:53:51PM +0200, Lukic wrote:
> > So, my question is: What is doing HFA384X_OUTW(0x0080,
> > HFA384X_PCICOR_OFF);??

> > Did we do all we have to do before sending this to card? Or is it a hardware
> > error?

> The most important part is to disable interrupts or mask them out before
> resetting the card. It was done, however, not always in proper order.

Actually, I did not test this at all with shared IRQs. I continued today
with similar tests, but added flood of shared IRQs from other devices
during the sreset. I shared the interrupt with Prism2.5 PCI card and
wired Ethernet card and then flooded both interfaces during sreset.

I don't know why, but the host system does indeed crash quite often
after setting sreset bit in COR. Since I did not find any better way of
fixing this, I changed Host AP driver to disable all shared interrupts
(on the interrupt it is using) during COR sreset. This seemed to remove
most of the crashes. I'm still able to crash the system every now and
then (over 100 'iwpriv wlan0 reset 1' during ping flood for both eth0
and wlan0), but it certainly takes more trying than before..

Jouni Malinen                                            PGP id EFC895FA

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