staging: comedi: pcl726: Use 16-bit 0 for interrupt data

The pcl726 driver has an "interrupt" subdevice that supports Comedi
asynchronous commands, placing a value in the Comedi buffer for each
interrupt.  The subdevice uses Comedi's 16-bit sample format but the
interrupt handler is calling `comedi_buf_write_samples()` with the
address of a 32-bit integer `&s->state`.  On bigendian machines, this
will copy 2 bytes from the wrong end of the 32-bit integer.  This isn't
really a problem since `s->state` will always be 0 for this subdevice,
but clean it up by using a 16-bit variable initialized to 0 to pass the
value.

Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Link: https://lore.kernel.org/r/20210223143055.257402-15-abbotti@mev.co.uk
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/comedi/drivers/pcl726.c b/drivers/staging/comedi/drivers/pcl726.c
index 64eb649..88f25d7 100644 (file)
--- a/drivers/staging/comedi/drivers/pcl726.c
+++ b/drivers/staging/comedi/drivers/pcl726.c
@@ -220,9 +220,11 @@ static irqreturn_t pcl726_interrupt(int irq, void *d)
        struct pcl726_private *devpriv = dev->private;
 
        if (devpriv->cmd_running) {
+               unsigned short val = 0;
+
                pcl726_intr_cancel(dev, s);
 
-               comedi_buf_write_samples(s, &s->state, 1);
+               comedi_buf_write_samples(s, &val, 1);
                comedi_handle_events(dev, s);
        }