From: Julian Wiedmann <jwi@linux.vnet.ibm.com>
Date: Tue, 15 Aug 2017 17:02:42 +0200
Subject: s390/qeth: simplify fragment type selection
Patch-mainline: v4.14-rc1
Git-commit: 5258830bf6a2af4fd4c3521a37541ee59095d010
References: bsc#1061024 FATE#323301
Improve readability of the code that determines a buffer element's
fragment type, and reduce the number of cases down from 5 to 3.
Signed-off-by: Julian Wiedmann <jwi@linux.vnet.ibm.com>
Acked-by: Ursula Braun <ubraun@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
drivers/s390/net/qeth_core_main.c | 23 ++++++++---------------
1 file changed, 8 insertions(+), 15 deletions(-)
--- a/drivers/s390/net/qeth_core_main.c
+++ b/drivers/s390/net/qeth_core_main.c
@@ -3918,23 +3918,16 @@ static inline void __qeth_fill_buffer(st
buffer->element[element].addr = data;
buffer->element[element].length = length_here;
length -= length_here;
- if (!length) {
- if (first_lap)
- if (skb_shinfo(skb)->nr_frags)
- buffer->element[element].eflags =
- SBAL_EFLAGS_FIRST_FRAG;
- else
- buffer->element[element].eflags = 0;
- else
- buffer->element[element].eflags =
- SBAL_EFLAGS_MIDDLE_FRAG;
- } else {
- if (first_lap)
+ if (first_lap) {
+ if (length || skb_is_nonlinear(skb))
+ /* skb needs additional elements */
buffer->element[element].eflags =
- SBAL_EFLAGS_FIRST_FRAG;
+ SBAL_EFLAGS_FIRST_FRAG;
else
- buffer->element[element].eflags =
- SBAL_EFLAGS_MIDDLE_FRAG;
+ buffer->element[element].eflags = 0;
+ } else {
+ buffer->element[element].eflags =
+ SBAL_EFLAGS_MIDDLE_FRAG;
}
data += length_here;
element++;