Re: Midi issue with 1.0.12 and ice1712

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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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