Re: mplayer v4l hangs in 188.8.131.52/4 (likely regression)
From: koos vriezen
Date: Sat May 17 2008 - 16:06:48 EST
2008/5/17 Arjan van de Ven <arjan@xxxxxxxxxxxxx>:
> > so.. bttv first takes "fh->cap.vb_lock" in vidiocgmbuf, then calls videobuf_mmap_setup(), and the first thing that does
is to also take fh->cap.vb_lock! This isn't even an ABBA deadlock,
but a straight AA deadlock :)
Looks like I'm the only one actually running this code ;-)
> and here is an (untest) patch that should fix this problem:
> Koos, can you apply this to your kernel tree and report back if this
> fixes your deadlock?
patching file drivers/media/video/bt8xx/bttv-driver.c
patching file drivers/media/video/videobuf-core.c
Hunk #1 succeeded at 335 (offset 4 lines).
Hunk #2 succeeded at 1093 (offset -36 lines).
patching file include/media/videobuf-core.h
Hunk #1 succeeded at 227 (offset -10 lines).
Deadlock is gone, only mplayer fails to unmute the audio. Again the
Xvideo player works okay (with audio).
Hmm, using v4l2 (mplayer .. -tv noaudio:driver=v4l2:devic..) works
with audio now (used to be the other way around). I can live with
Thanks for your help,
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