staging: comedi: pcl812: interrupt handlers should not busywait
authorH Hartley Sweeten <hsweeten@visionengravers.com>
Tue, 4 Mar 2014 18:29:32 +0000 (11:29 -0700)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Fri, 7 Mar 2014 01:06:11 +0000 (17:06 -0800)
commitdb0446d0e2a059d3961210664a08dcd8104e448b
tree15a3fc36f0e022050f835635f69d5d41d5da6d20
parent080ee8820d9c17b79658b03e35b6236c041068b8
staging: comedi: pcl812: interrupt handlers should not busywait

The interrupt is only generated by the hardware at the completion of
an A/D conversion. Because of this the sanity check to make sure that
the A/D conversion is complete and data is available is probably
unnecessary but it doesn't hurt anything.

The busywait loop is a different issue. Interrupt routines should not
busywait. That's just mean...

Remove the bustwait and use pcl812_ai_eoc() to check for the end-of-
conversion.

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/pcl812.c