staging: comedi: pcl818: interrupt handlers should not busywait
authorH Hartley Sweeten <hsweeten@visionengravers.com>
Tue, 4 Mar 2014 18:29:33 +0000 (11:29 -0700)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Fri, 7 Mar 2014 01:06:11 +0000 (17:06 -0800)
commit127005717dfc5bf42091a14e5a9736f52bfaea1c
treea39b096691b042ec3ad62a61012644511f7dbb8c
parentdb0446d0e2a059d3961210664a08dcd8104e448b
staging: comedi: pcl818: 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 pcl818_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/pcl818.c