At Thu, 26 Oct 2006 09:18:13 +0200,
Clemens Ladisch wrote:
>
> Bob van der Poel wrote:
> > I've just installed Mandriva 2007. It is using alsa 1.0.12 with my
> > audiophile 2496 card. Oh, this is on linux kernel 2.6.17-5mdv.
> >
> > There appears to be a problem with midi output. A few times now my
> > entire computer has locked while playing a midi file using aplaymidi.
>
> This looks like the RTC bug.
Yes, there is a known ABBA deadlock between rtc and snd-timer.
At least, we need to remove a spinlock in rtc.c. The patch below
should fix, but it seems not enough to clean up all problems.
Unfortunately, I've had little time to investigate it yet.
Takashi
diff --git a/drivers/char/rtc.c b/drivers/char/rtc.c
index ab6429b..46d2896 100644
--- a/drivers/char/rtc.c
+++ b/drivers/char/rtc.c
@@ -869,15 +869,10 @@ int rtc_control(rtc_task_t *task, unsign
#ifndef RTC_IRQ
return -EIO;
#else
- unsigned long flags;
if (cmd != RTC_PIE_ON && cmd != RTC_PIE_OFF && cmd != RTC_IRQP_SET)
return -EINVAL;
- spin_lock_irqsave(&rtc_task_lock, flags);
- if (rtc_callback != task) {
- spin_unlock_irqrestore(&rtc_task_lock, flags);
+ if (rtc_callback != task)
return -ENXIO;
- }
- spin_unlock_irqrestore(&rtc_task_lock, flags);
return rtc_do_ioctl(cmd, arg, 1);
#endif
}
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