From: Hans de Goede <hdegoede@redhat.com>
Date: Sun, 9 Oct 2011 13:28:27 +0000 (-0300)
Subject: [media] pwc: poll(): Check that the device has not beem claimed for streaming already
X-Git-Tag: v3.5-rc1~104^2~480
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=296da3cd14db9eb5606924962b2956c9c656dbb0;p=pandora-kernel.git

[media] pwc: poll(): Check that the device has not beem claimed for streaming already

Some apps which use read() start the streaming through a call to poll(),
this means that if another app has already claimed the device for streaming
(through for example a s_fmt, or a reqbufs), that the poll should fail instead
of getting passed through to vb2_poll.

We only check for this when the app is polling for reads, so that ctrl events
still work.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
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