Messages in this thread | | | From | Michael Buesch <> | Subject | Re: Threaded interrupt handlers broken? | Date | Sun, 16 Aug 2009 19:51:13 +0200 |
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On Sunday 16 August 2009 16:25:13 Thomas Gleixner wrote: > On Sun, 16 Aug 2009, Michael Buesch wrote: > > On Sunday 16 August 2009 15:22:29 Thomas Gleixner wrote: > > > > > > + if (0&&unlikely(desc->status & IRQ_DISABLED)) { > > > > > > So the interrupt is marked disabled. How do you setup the handler > > > ? And what does the primary handler do ? Can you post your driver > > > code please? > > > > This patch converts the b43 driver to threaded interrupts: > > http://bu3sch.de/patches/wireless-testing/20090816-1535/patches/002-b43-threaded-irq-handler.patch > > On the first glance this looks not too bad. the unlocked access to the > irq status registers looks a bit scary, but that is not relevant for > the problem at hand.
Yeah it does ;)
> > It kind of works with this hack applied to kernel/irq/manage.c > > Hmm. Is the interrupt of the device shared ?
It's registered as shared, but on my machine it is not shared with anything else.
> If yes, what's the other > device on that interrupt line ? what puzzles me is the fact that the > IRQ_DISABLED flag is set. Is there anything unusual in dmesg ?
Here's my current kernel log with the two patches applied: http://bu3sch.de/misc/dmesg
> > > So you wake when the thread counter is != 0 after the decrement. > > > > > > #define atomic_dec_and_test(v) (atomic_sub_return(1, (v)) == 0) > > > > Yeah, isn't that what we want to do? I read the test as "wake other threads, > > if there are other threads" or something like that. > > No, it's for synchronize_irq(). When there are threaded handlers in > progress, then sychronize_irq() waits on the waitqueue until they are > finished. So we wake the queue when the last threaded handler of this > irq line returns from thread_fn.
Ok, I understand.
-- Greetings, Michael.
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