From: Julian Wiedmann <jwi@linux.ibm.com>
Date: Thu, 20 Feb 2020 15:54:56 +0100
Subject: s390/qeth: fix off-by-one in RX copybreak check
Git-commit: 54a61fbc020fd2e305680871c453abcf7fc0339b
Patch-mainline: v5.6-rc3
References: git-fixes

The RX copybreak is intended as the _max_ value where the frame's data
should be copied. So for frame_len == copybreak, don't build an SG skb.

Fixes: 4a71df50047f ("qeth: new qeth device driver")
Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
 drivers/s390/net/qeth_core_main.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/s390/net/qeth_core_main.c
+++ b/drivers/s390/net/qeth_core_main.c
@@ -5147,7 +5147,7 @@ next_packet:
 	}
 
 	use_rx_sg = (card->options.cq == QETH_CQ_ENABLED) ||
-		    ((skb_len >= card->options.rx_sg_cb) &&
+		    (skb_len > card->options.rx_sg_cb &&
 		     !atomic_read(&card->force_alloc_skb) &&
 		     !IS_OSN(card));