1 files changed, 4 insertions, 4 deletions

diff --git a/drivers/firewire/net.c b/drivers/firewire/net.c
index cbaa8d776d83..15475892af0c 100644
--- a/drivers/firewire/net.c
+++ b/drivers/firewire/net.c
@@ -73,13 +73,13 @@ struct rfc2734_header {
 
 #define fwnet_get_hdr_lf(h)             (((h)->w0 & 0xc0000000) >> 30)
 #define fwnet_get_hdr_ether_type(h)     (((h)->w0 & 0x0000ffff))
-#define fwnet_get_hdr_dg_size(h)        (((h)->w0 & 0x0fff0000) >> 16)
+#define fwnet_get_hdr_dg_size(h)        ((((h)->w0 & 0x0fff0000) >> 16) + 1)
 #define fwnet_get_hdr_fg_off(h)         (((h)->w0 & 0x00000fff))
 #define fwnet_get_hdr_dgl(h)            (((h)->w1 & 0xffff0000) >> 16)
 
-#define fwnet_set_hdr_lf(lf)            ((lf)  << 30)
+#define fwnet_set_hdr_lf(lf)            ((lf) << 30)
 #define fwnet_set_hdr_ether_type(et)    (et)
-#define fwnet_set_hdr_dg_size(dgs)      ((dgs) << 16)
+#define fwnet_set_hdr_dg_size(dgs)      (((dgs) - 1) << 16)
 #define fwnet_set_hdr_fg_off(fgo)       (fgo)
 
 #define fwnet_set_hdr_dgl(dgl)          ((dgl) << 16)
@@ -622,7 +622,7 @@ static int fwnet_incoming_packet(struct fwnet_device *dev, __be32 *buf, int len,
                 fg_off = fwnet_get_hdr_fg_off(&hdr);
         }
         datagram_label = fwnet_get_hdr_dgl(&hdr);
-        dg_size = fwnet_get_hdr_dg_size(&hdr); /* ??? + 1 */
+        dg_size = fwnet_get_hdr_dg_size(&hdr);
 
         if (fg_off + len > dg_size)
                 return 0;