staging: comedi: usbduxsigma: fix unaligned dereferences

There are a couple of dereferences such as `*(uint32_t
*)(devpriv->insn_buf + 1)` that are unaligned as `devpriv->insn_buf` is
of type `uint8_t *`.  This works on x86 architecture but may not be
supported on other architectures.  Call `get_unalign()` to perform the
unaligned dereferences.

Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Cc: Bernd Porr <mail@berndporr.me.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/comedi/drivers/usbduxsigma.c b/drivers/staging/comedi/drivers/usbduxsigma.c
index 3beeb12541522b2bf8cd04bd898754d3f9365487..88c60b6020c48b971682f2d31700dd549ecdd1af 100644 (file)
--- a/drivers/staging/comedi/drivers/usbduxsigma.c
+++ b/drivers/staging/comedi/drivers/usbduxsigma.c
@@ -48,6 +48,7 @@
 #include <linux/usb.h>
 #include <linux/fcntl.h>
 #include <linux/compiler.h>
+#include <asm/unaligned.h>
 
 #include "comedi_fc.h"
 #include "../comedidev.h"
@@ -792,7 +793,8 @@ static int usbduxsigma_ai_insn_read(struct comedi_device *dev,
                }
 
                /* 32 bits big endian from the A/D converter */
-               val = be32_to_cpu(*((uint32_t *)((devpriv->insn_buf) + 1)));
+               val = be32_to_cpu(get_unaligned((uint32_t
+                                                *)(devpriv->insn_buf + 1)));
                val &= 0x00ffffff;      /* strip status byte */
                val ^= 0x00800000;      /* convert to unsigned */
 
@@ -1357,7 +1359,7 @@ static int usbduxsigma_getstatusinfo(struct comedi_device *dev, int chan)
                return ret;
 
        /* 32 bits big endian from the A/D converter */
-       val = be32_to_cpu(*((uint32_t *)((devpriv->insn_buf)+1)));
+       val = be32_to_cpu(get_unaligned((uint32_t *)(devpriv->insn_buf + 1)));
        val &= 0x00ffffff;      /* strip status byte */
        val ^= 0x00800000;      /* convert to unsigned */