From: H Hartley Sweeten <hsweeten@visionengravers.com>
Date: Mon, 26 Jan 2015 23:17:20 +0000 (-0700)
Subject: staging: comedi: das16: fix DMA size for short transfers
X-Git-Tag: fixes-v4.0-rc1~99^2~121
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1dc6e72903f6dbefd79ea2e9ce9c9e536e4e695b;p=pandora-kernel.git

staging: comedi: das16: fix DMA size for short transfers

Currently this driver alwasy programs the DMA transfer to be the allocated
size of the DMA buffer. When the async command 'stop_src' is TRIG_COUNT its
possible (likely) for the last transfer to be less than the buffer size.

Introduce a helper function, das16_ai_setup_dma(), to calculate the actual
size of the DMA transfer based on the number of samples remaining and the
number of unread samples.

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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