From: Aidan Thornton <makosoft@googlemail.com>
Date: Sun, 13 Apr 2008 18:09:36 +0000 (-0300)
Subject: V4L/DVB (7565): em28xx: fix buffer underrun handling
X-Git-Tag: v2.6.26-rc1~1084^2~149
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3b5fa928a6b2971ec65571745defc5d9758b4bc1;p=pandora-kernel.git

V4L/DVB (7565): em28xx: fix buffer underrun handling

This patch fixes three related issues and a fourth trivial one:

- Use buffers even if no-one's currently waiting for them (fixes
  underrun issues);

- Don't return incomplete/mangled frames at the start of streaming and
  in the case of buffer underruns;

- Fix an issue which could cause the driver to write to a buffer that's
  been freed after videobuf_queue_cancel is called (exposed by the
  previous two fixes - for some reason, ignoring buffers that weren't
  being waited on worked around the issue);

- Fix a bug which could cause only one field to be filled in the first
  buffer (or first few buffers) after streaming is started.

Signed-off-by: Aidan Thornton <makosoft@googlemail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
---

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