From: H Hartley Sweeten <hsweeten@visionengravers.com>
Date: Mon, 12 Jan 2015 17:56:04 +0000 (-0700)
Subject: staging: comedi: pcl816: fix short DMA transactions
X-Git-Tag: fixes-v4.0-rc1~99^2~412
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ceb41be712b68fac4ac834120a80fc3cb8e5ac37;p=pandora-kernel.git

staging: comedi: pcl816: fix short DMA transactions

When the cmd->stop_src == TRIG_COUNT the last DMA transfer might be smaller
than the buffer size. This results in invalid data being added to the async
buffer.

Add a 'size' member to the DMA descriptor and initialize it with the
actual size of the DMA transfer. Use that in interrupt and ai subdevice
(*poll) function to return the proper number of samples. Use the
comedi_bytes_to_samples() helper to convert the byte size to comedi
samples in the interrupt handler.

Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Reviewed-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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