Regression affecting b43 LP-PHY card

Rafał Miłecki zajec5 at
Mon May 9 18:52:15 EDT 2011

Juan owns Lenovo affected by well-known LP-PHY DMA errors. His testing
procedure is following:
modprobe wl; connect; download sth small; rmmod wl;
modprobe b43; download 2GB

When working on DMA errors we discovered that wireless-testing is not
working well for him. Even after performing above procedure his
machine disconnects quickly and he is not able to reconnect. We tested
2.6.39-rc6 from tarball and it was working fine. I'd like to highlight
here, that we were switching between mainline and wireless-testing few
times. It is not a random issue.

I suspected this regression could be caused by my recent ssb patches.
So I reverted all of them but this didn't help.

In this situation we decided to bisect. I was a little afraid of last
merges so we took older 2.6.38 as GOOD (we tested this twice) and
wireless-testing commit before my ssb changes as BAD. Today Juan
finished bisecting kernel:

According to his bisection the first bad commit is
e06383db9ec591696a06654257474b85bac1f8cb [0]:
hrtimers: extend hrtimer base code to handle more then 2 clockids

Does it make any sense to you? Could this be some timing issue?

It was too late to test this today, we (Juan) will work on this
tomorrow. It's impossible to revert this commit from HEAD of
wireless-testing, so my idea is to checkout commit, test, revert,

Did anyone else experience any similar problems with latest wireless-testing?;a=commit;h=e06383db9ec591696a06654257474b85bac1f8cb


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