Use the dev->read_subdev that was setup in the device attach instead
of accessing the dev->subdevices array directly.

Signed-off-by: H Hartley Sweeten <hswee...@visionengravers.com>
Cc: Ian Abbott <abbo...@mev.co.uk>
Cc: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
 drivers/staging/comedi/drivers/dt3000.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/staging/comedi/drivers/dt3000.c 
b/drivers/staging/comedi/drivers/dt3000.c
index 4a41c09..fbe2ee4 100644
--- a/drivers/staging/comedi/drivers/dt3000.c
+++ b/drivers/staging/comedi/drivers/dt3000.c
@@ -352,13 +352,12 @@ static irqreturn_t dt3k_interrupt(int irq, void *d)
 {
        struct comedi_device *dev = d;
        struct dt3k_private *devpriv = dev->private;
-       struct comedi_subdevice *s;
+       struct comedi_subdevice *s = dev->read_subdev;
        unsigned int status;
 
        if (!dev->attached)
                return IRQ_NONE;
 
-       s = &dev->subdevices[0];
        status = readw(devpriv->io_addr + DPR_Intr_Flag);
 
        if (status & DT3000_ADFULL) {
-- 
1.8.4.4

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