tcp: Make prior_ssthresh a u32

If previous window was above representable values of u16,
strange things will happen if undo with the truncated value
is called for. Alternatively, this could be fixed by some
max trickery but that would limit undoing high-speed undos.

Adds 16-bit hole but there isn't anything to fill it with.

Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@helsinki.fi>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/include/linux/tcp.h b/include/linux/tcp.h
index d96d9b1223042320c055f49a2fba9edb0c586a40..18e62e3d406fe86a83e03a8a34257b54fd069ba7 100644 (file)
--- a/include/linux/tcp.h
+++ b/include/linux/tcp.h
@@ -355,7 +355,7 @@ struct tcp_sock {
        u32     lost_retrans_low;       /* Sent seq after any rxmit (lowest) */
 
        u16     advmss;         /* Advertised MSS                       */
-       u16     prior_ssthresh; /* ssthresh saved at recovery start     */
+       u32     prior_ssthresh; /* ssthresh saved at recovery start     */
        u32     lost_out;       /* Lost packets                 */
        u32     sacked_out;     /* SACK'd packets                       */
        u32     fackets_out;    /* FACK'd packets                       */