staging: comedi: pcl818: exit interrupt quick when there is nothing to do
authorH Hartley Sweeten <hsweeten@visionengravers.com>
Tue, 4 Mar 2014 18:29:48 +0000 (11:29 -0700)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Fri, 7 Mar 2014 01:06:14 +0000 (17:06 -0800)
commit10933a9cfa258048813fd8a287be844d30711731
tree43e4287e27304c1cadf238ee5e3aac5cbdd52c8c
parentd7a9f769ba0134cbcc55008f167c97227b024798
staging: comedi: pcl818: exit interrupt quick when there is nothing to do

If an async ai command is not running or the ai_mode is 0 the interrupt
routine doesn't do anything other than spew some noise and clear the
interrupt request in the hardware.

Because this driver is manually attached, the "premature interrupt"
check in the interrupt handler should never happen. The interrupt is
only hooked up during the attach and it's released during the detach.

Combine these checks so that the interrupt function exits quick if it
has nothing to handle. Remove the noise.

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