staging: comedi: pcl816: tidy up dma buffer allocation
authorH Hartley Sweeten <hsweeten@visionengravers.com>
Mon, 17 Feb 2014 21:27:29 +0000 (14:27 -0700)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Tue, 18 Feb 2014 19:55:32 +0000 (11:55 -0800)
commit55b95f14304a7daa8f5253e4054a951e036c735d
treece122f1ece449465b7745c0232f684c55c2030eb
parent00ebe61736b56336bf6a48394602b0846637e6df
staging: comedi: pcl816: tidy up dma buffer allocation

This driver uses 2 buffers for DMA. Refactor the buffer allocation to
use a for loop to remove code duplication. Remove the dev_err() messages
when __get_dma_pages() fails and change the errno returned from -EBUSY
to -ENOMEM.

Both buffers are the same size so replace the 'dmapages' and 'hwdmasize'
arrays in the private data with variables to save a bit of space.

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>
drivers/staging/comedi/drivers/pcl816.c