[IA64-SGI] fix unaligned memory access in snsc_event.c

It's been pointed out that environmental events from the system
controllers on Altix machines cause the kernel to complain about
unaligned memory accesses.  This turns out to be because
"be32_to_cpup()" didn't do everything I thought/hoped it did.
I've added calls to pull the offending integers out of the
buffers using get_unaligned() before feeding them to
be32_to_cpup().

Signed-off-by: Greg Howard <ghoward@sgi.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>

diff --git a/drivers/char/snsc_event.c b/drivers/char/snsc_event.c
index d692af5..baaa365 100644 (file)
--- a/drivers/char/snsc_event.c
+++ b/drivers/char/snsc_event.c
@@ -19,6 +19,7 @@
 #include <linux/sched.h>
 #include <linux/byteorder/generic.h>
 #include <asm/sn/sn_sal.h>
+#include <asm/unaligned.h>
 #include "snsc.h"
 
 static struct subch_data_s *event_sd;
@@ -62,13 +63,16 @@ static int
 scdrv_parse_event(char *event, int *src, int *code, int *esp_code, char *desc)
 {
        char *desc_end;
+       __be32 from_buf;
 
        /* record event source address */
-       *src = be32_to_cpup((__be32 *)event);
+       from_buf = get_unaligned((__be32 *)event);
+       *src = be32_to_cpup(&from_buf);
        event += 4;                     /* move on to event code */
 
        /* record the system controller's event code */
-       *code = be32_to_cpup((__be32 *)event);
+       from_buf = get_unaligned((__be32 *)event);
+       *code = be32_to_cpup(&from_buf);
        event += 4;                     /* move on to event arguments */
 
        /* how many arguments are in the packet? */
@@ -82,7 +86,8 @@ scdrv_parse_event(char *event, int *src, int *code, int *esp_code, char *desc)
                /* not an integer argument, so give up */
                return -1;
        }
-       *esp_code = be32_to_cpup((__be32 *)event);
+       from_buf = get_unaligned((__be32 *)event);
+       *esp_code = be32_to_cpup(&from_buf);
        event += 4;
 
        /* parse out the event description */