linux-kernel - Re: [PATCH v2.6.38 resend 0/7] cx88 deadlock and data races

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Date:	Sun, 01 May 2011 12:27:16 +0100
From:	linuxtv <linuxtv@...star.net>
To:	Jonathan Nieder <jrnieder@...il.com>
CC:	linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
	Dan Carpenter <error27@...il.com>,
	Hans Verkuil <hverkuil@...all.nl>, Andi Huber <hobrom@....at>,
	Marlon de Boer <marlon@...es.nl>,
	Damien Churchill <damoxc@...il.com>
Subject: Re: [PATCH v2.6.38 resend 0/7] cx88 deadlock and data races

FYI I too experienced the problem of hanging and used the patch dated
6th April to get it working.
However I do have the problem that sound does not always work/come on.
Once it is started it stays, getting it started is not reliable.

On 01/05/11 10:17, Jonathan Nieder wrote:
> Hi,
>
> Since v2.6.37 (BKL removal), trying to open a cx88-blackbird driven
> MPEG device would hang.  Ben Hutchings provided an initial patch[1] to
> fix that, and Andi Huber helped a lot in finding races that patch had
> missed.  Ben requested that I take authorship of the series, so I've
> done so.
>
> These patches have visited the list twice before[2], towards the
> beginning of this month.  No feedback from maintainers or reviewers
> --- I'm beginning to wonder if I have the right list.  Luckily two
> people[3][4] experiencing this problem on bugzilla were kind enough to
> test the series and found it worked okay.
>
> Patches are against v2.6.38 (but they do not conflict with anything in
> media-tree/staging/for_v2.6.40).  The intent is to include them in
> v2.6.40 if possible.  A copy of these patches is also available for
> convenient fetching from
>
>   git://repo.or.cz/linux-2.6/jrn.git cx88-locking
>
> Thoughts?
>
> Jonathan Nieder (7):
>   [media] cx88: protect per-device driver list with device lock
>   [media] cx88: fix locking of sub-driver operations
>   [media] cx88: hold device lock during sub-driver initialization
>   [media] cx88: protect cx8802_devlist with a mutex
>   [media] cx88: gracefully reject attempts to use unregistered
>     cx88-blackbird driver
>   [media] cx88: don't use atomic_t for core->mpeg_users
>   [media] cx88: don't use atomic_t for core->users
>
>  drivers/media/video/cx88/cx88-blackbird.c |   41 +++++++++++++++-------------
>  drivers/media/video/cx88/cx88-dvb.c       |    2 +
>  drivers/media/video/cx88/cx88-mpeg.c      |   40 ++++++++++++++++++----------
>  drivers/media/video/cx88/cx88-video.c     |    5 ++-
>  drivers/media/video/cx88/cx88.h           |   11 +++++--
>  5 files changed, 61 insertions(+), 38 deletions(-)
>
> [1] http://bugs.debian.org/619827
> [2] http://thread.gmane.org/gmane.linux.kernel/1118815
> [3] https://bugzilla.kernel.org/show_bug.cgi?id=31792
> [4] https://bugzilla.kernel.org/show_bug.cgi?id=31962
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