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| author | H Hartley Sweeten <hsweeten@visionengravers.com> | 2015-10-06 00:23:07 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-10-13 07:16:05 +0300 |
| commit | 77e7c200f37536e05f714bcebc34f58aba9eabfc (patch) | |
| tree | 9471bf12fa43bb50e7c572586e73a2ce962acad5 | |
| parent | f676376d692d8e02603e2bf1d0b4e8ca1b56506d (diff) | |
| download | linux-77e7c200f37536e05f714bcebc34f58aba9eabfc.tar.xz | |
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>
| -rw-r--r-- | drivers/staging/comedi/drivers/quatech_daqp_cs.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/staging/comedi/drivers/quatech_daqp_cs.c b/drivers/staging/comedi/drivers/quatech_daqp_cs.c index 7432e5761539..c44e7ec19e47 100644 --- a/drivers/staging/comedi/drivers/quatech_daqp_cs.c +++ b/drivers/staging/comedi/drivers/quatech_daqp_cs.c @@ -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; |