[PATCH net-next 04/12] s390/qeth: simplify fragment type selection

Julian Wiedmann
2017-08-15T15:02:42Z

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>
---
drivers/s390/net/qeth_core_main.c | 23 ++++++++---------------
1 file changed, 8 insertions(+), 15 deletions(-)

diff --git a/drivers/s390/net/qeth_core_main.c b/drivers/s390/net/qeth_core_main.c
index 4792cabb862e..3623ba23ff0b 100644
--- 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(struct sk_buff *skb,
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++;
--
2.11.2