[linux-dvb] [BUG] changeset 9029 (http://linuxtv.org/hg/v4l-dvb/rev/aa3e5cc1d833)

Oliver Endriss o.endriss at gmx.de
Sun Feb 15 13:36:16 CET 2009


e9hack wrote:
> Hi,
> 
> this change set is wrong. The affected functions cannot be called from an interrupt
> context, because they may process large buffers. In this case, interrupts are disabled for
> a long time. Functions, like dvb_dmx_swfilter_packets(), could be called only from a
> tasklet. This change set does hide some strong design bugs in dm1105.c and au0828-dvb.c.
> 
> Please revert this change set and do fix the bugs in dm1105.c and au0828-dvb.c (and other
> files).

@Mauro:

This changeset _must_ be reverted! It breaks all kernels since 2.6.27
for applications which use DVB and require a low interrupt latency.

It is a very bad idea to call the demuxer to process data buffers with
interrupts disabled!

FYI, a LIRC problem was reported here:
  http://vdrportal.de/board/thread.php?postid=786366#post786366

and it has been verified that changeset
  http://linuxtv.org/hg/v4l-dvb/rev/aa3e5cc1d833
causes the problem:
  http://vdrportal.de/board/thread.php?postid=791813#post791813

Please revert this changeset immediately and submit a fix to the stable
kernels >= 2.6.27.

CU
Oliver

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