Re: [PATCH] Fix shared interrupt handling of SA_INTERRUPT andSA_SAMPLE_RANDOM

[Andrew Morton]

Takashi Iwai <tiwai@xxxxxxx> wrote:
>
> while the recent investation of latency issues, Thomas Charbonne
>  suggested that there is a long-standing bug in the irq handler.
>  When the irq is shared, SA_INTERRUPT flag is checked only for the
>  first registered handler.  When it's without SA_INTERRUPT, always
>  local_irq_enable() is called even if the second or later handler has
>  SA_INTERRUPT.

That's because SA_INTERRUPT interrupts shouldn't be shared.  The grey cell
which remembered why this is so seems to have died, but I've put the email
thread here: http://www.zip.com.au/~akpm/linux/patches/stuff/x.txt
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