From: Roland Vossen <rvossen@xxxxxxxxxxxx> Problem would pop up during driver load on a Sun Fire V120 and manifested itself as an exception. This was caused by int* pointers provided to memcpy() that were not aligned on an int boundary. The pointer type provided to memcpy() is used by the compiler for optimization purposes. Fix was to cast the int* pointers to void* pointers. Bernhard R. Link and David S. Miller provided valuable feedback, thanks gents. Reviewed-by: Arend van Spriel <arend@xxxxxxxxxxxx> Reviewed-by: Pieter-Paul Giesberts <pieterpg@xxxxxxxxxxxx> Signed-off-by: Arend van Spriel <arend@xxxxxxxxxxxx> --- drivers/staging/brcm80211/brcmsmac/main.c | 7 +++++-- 1 files changed, 5 insertions(+), 2 deletions(-) diff --git a/drivers/staging/brcm80211/brcmsmac/main.c b/drivers/staging/brcm80211/brcmsmac/main.c index c625c25..7e729d29 100644 --- a/drivers/staging/brcm80211/brcmsmac/main.c +++ b/drivers/staging/brcm80211/brcmsmac/main.c @@ -6111,9 +6111,12 @@ _brcms_c_ioctl(struct brcms_c_info *wlc, int cmd, void *arg, int len, /* default argument is generic integer */ pval = arg ? (int *)arg : NULL; - /* This will prevent the misaligned access */ + /* + * This will prevent misaligned access. The (void *) cast prevents a + * memcpy alignment issue on e.g. Sparc64 platforms. + */ if (pval && (u32) len >= sizeof(val)) - memcpy(&val, pval, sizeof(val)); + memcpy((void *)&val, (void *)pval, sizeof(val)); else val = 0; -- 1.7.4.1 _______________________________________________ devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxx http://driverdev.linuxdriverproject.org/mailman/listinfo/devel
