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| author | Greg Howard <ghoward@sgi.com> | 2005-08-15 13:00:00 -0700 |
|---|---|---|
| committer | Tony Luck <tony.luck@intel.com> | 2005-08-15 14:17:49 -0700 |
| commit | 1a402aaca51b7d56e62348f50a426c531b6bc29e (patch) | |
| tree | f11678902e54db1205bad348e2a6cdb2017ccfbe /drivers/char/snsc_event.c | |
| parent | 2ba84684e8cf6f980e4e95a2300f53a505eb794e (diff) | |
| download | lwn-1a402aaca51b7d56e62348f50a426c531b6bc29e.tar.gz lwn-1a402aaca51b7d56e62348f50a426c531b6bc29e.zip | |
[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>
Diffstat (limited to 'drivers/char/snsc_event.c')
| -rw-r--r-- | drivers/char/snsc_event.c | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/drivers/char/snsc_event.c b/drivers/char/snsc_event.c index d692af57213a..baaa365285fa 100644 --- 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 */ |