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staging: comedi: quatech_daqp_cs: handle shared interrupt

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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>
This commit is contained in:
H Hartley Sweeten
2015-10-05 14:23:07 -07:00
committed by Greg Kroah-Hartman
parent f676376d69
commit 77e7c200f3
1 changed files with 3 additions and 0 deletions
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3
drivers/staging/comedi/drivers/quatech_daqp_cs.c
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@@ -214,6 +214,9 @@ static irqreturn_t daqp_interrupt(int irq, void *dev_id)
return IRQ_NONE;
status = inb(dev->iobase + DAQP_STATUS_REG);
if (!(status & DAQP_STATUS_EVENTS))
return IRQ_NONE;
while (!(status & DAQP_STATUS_FIFO_EMPTY)) {
unsigned short data;