staging: comedi: quatech_daqp_cs: handle shared interrupt
This is a PCMCIA driver and interrupts are always shared. Detect if the hardware did not produce the interrupt and return IRQ_NONE so that other drivers might handle it. 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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