Messages in this thread | | | From | Arnd Bergmann <> | Subject | Re: contention on long-held spinlock | Date | Tue, 23 Aug 2011 18:24:48 +0200 |
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On Friday 19 August 2011, Bryan Donlan wrote: > That's what mutexes are for. Note, however, that interrupt handlers > cannot use mutexes as they cannot sleep, nor can they wait for lock > holders which may themselves sleep.
I agree that there is probably some other bug that needs to be fixed in the driver, but for testing it may well be worth replacing the spinlock with a mutex and the request_irq with request_threaded_irq. A threaded IRQ is slower than a normal one but does allow mutexes.
Arnd
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