#define MSGTRACE_VERSION       1
 
-#define BRCMF_PKT_FILTER_FIXED_LEN     offsetof(struct brcmf_pkt_filter_le, u)
-#define BRCMF_PKT_FILTER_PATTERN_FIXED_LEN     \
-       offsetof(struct brcmf_pkt_filter_pattern_le, mask_and_pattern)
-
 #ifdef DEBUG
 static const char brcmf_version[] =
        "Dongle Host Driver, version " BRCMF_VERSION_STR "\nCompiled on "
        }
 
        pkt_filter->u.pattern.size_bytes = cpu_to_le32(mask_size);
-       buf_len = sizeof(*pkt_filter);
-       buf_len -= sizeof(pkt_filter->u.pattern.mask_and_pattern);
+       buf_len = offsetof(struct brcmf_pkt_filter_le,
+                          u.pattern.mask_and_pattern);
        buf_len += mask_size + pattern_size;
 
        err = brcmf_fil_iovar_data_set(ifp, "pkt_filter_add", pkt_filter,