Takashi Iwai wrote:
> [...]
> Yes, there is a known ABBA deadlock between rtc and snd-timer.
> At least, we need to remove a spinlock in rtc.c.
>
> - spin_lock_irqsave(&rtc_task_lock, flags);
> if (rtc_callback != task) {
> - spin_unlock_irqrestore(&rtc_task_lock, flags);
> return -ENXIO;
> }
> - spin_unlock_irqrestore(&rtc_task_lock, flags);
This lock is needed to protect rtc_callback against concurrent accesses
from other clients.
I've committed a patch that just moves the code out of the RTC callback
into a tasklet. Besides being 'proper' kernel programming technique,
this also works with earlier kernels.
Regards,
Clemens
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