From: H Hartley Sweeten <hsweeten@visionengravers.com>
Date: Tue, 13 Jan 2015 17:16:44 +0000 (-0700)
Subject: staging: comedi: das1800: tidy up das1800_ai_transfer_size()
X-Git-Tag: fixes-v4.0-rc1~99^2~376
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5e5a21cf8e7756f668e7eb51ba99619136b79c4d;p=pandora-kernel.git

staging: comedi: das1800: tidy up das1800_ai_transfer_size()

For aesthetics, pass the fill time 'ns' as a parameter to this function.

Refactor this function to calculate the transfer size in 'samples' instead
of 'bytes'. This removes the need to constantly multiply the values by the
'sample_size'. It also helps avoid any possible integer overflow issues.

Use the comedi_nsamples_left() helper to limit the samples when cmd->stop_src
is TRIG_COUNT.

Use comedi_samples_to_bytes() to return the final DMA size in bytes.

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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