* [PATCH] net/sched: remove redundant null check on head
@ 2017-05-03 13:50 Colin King
2017-05-03 14:15 ` Jiri Pirko
` (2 more replies)
0 siblings, 3 replies; 5+ messages in thread
From: Colin King @ 2017-05-03 13:50 UTC (permalink / raw)
To: Jamal Hadi Salim, Cong Wang, Jiri Pirko, netdev
Cc: kernel-janitors, David S . Miller, linux-kernel
From: Colin Ian King <colin.king@canonical.com>
head is previously null checked and so the 2nd null check on head
is redundant and therefore can be removed.
Detected by CoverityScan, CID#1399505 ("Logically dead code")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
---
net/sched/cls_matchall.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/net/sched/cls_matchall.c b/net/sched/cls_matchall.c
index 2efb36c08f2a..dee469fed967 100644
--- a/net/sched/cls_matchall.c
+++ b/net/sched/cls_matchall.c
@@ -203,8 +203,7 @@ static int mall_change(struct net *net, struct sk_buff *in_skb,
*arg = (unsigned long) head;
rcu_assign_pointer(tp->root, new);
- if (head)
- call_rcu(&head->rcu, mall_destroy_rcu);
+ call_rcu(&head->rcu, mall_destroy_rcu);
return 0;
err_replace_hw_filter:
--
2.11.0
^ permalink raw reply related [flat|nested] 5+ messages in thread* Re: [PATCH] net/sched: remove redundant null check on head
2017-05-03 13:50 [PATCH] net/sched: remove redundant null check on head Colin King
@ 2017-05-03 14:15 ` Jiri Pirko
2017-05-03 14:21 ` walter harms
2017-05-04 15:01 ` David Miller
2 siblings, 0 replies; 5+ messages in thread
From: Jiri Pirko @ 2017-05-03 14:15 UTC (permalink / raw)
To: Colin King
Cc: Jamal Hadi Salim, Cong Wang, netdev, kernel-janitors,
David S . Miller, linux-kernel
Wed, May 03, 2017 at 03:50:40PM CEST, colin.king@canonical.com wrote:
>From: Colin Ian King <colin.king@canonical.com>
>
>head is previously null checked and so the 2nd null check on head
>is redundant and therefore can be removed.
>
>Detected by CoverityScan, CID#1399505 ("Logically dead code")
>
>Signed-off-by: Colin Ian King <colin.king@canonical.com>
Acked-by: Jiri Pirko <jiri@mellanox.com>
^ permalink raw reply [flat|nested] 5+ messages in thread* Re: [PATCH] net/sched: remove redundant null check on head
2017-05-03 13:50 [PATCH] net/sched: remove redundant null check on head Colin King
2017-05-03 14:15 ` Jiri Pirko
@ 2017-05-03 14:21 ` walter harms
2017-05-03 15:12 ` Jiri Pirko
2017-05-04 15:01 ` David Miller
2 siblings, 1 reply; 5+ messages in thread
From: walter harms @ 2017-05-03 14:21 UTC (permalink / raw)
To: Colin King
Cc: Jamal Hadi Salim, Cong Wang, Jiri Pirko, netdev, kernel-janitors
Am 03.05.2017 15:50, schrieb Colin King:
> From: Colin Ian King <colin.king@canonical.com>
>
> head is previously null checked and so the 2nd null check on head
> is redundant and therefore can be removed.
>
> Detected by CoverityScan, CID#1399505 ("Logically dead code")
>
> Signed-off-by: Colin Ian King <colin.king@canonical.com>
> ---
> net/sched/cls_matchall.c | 3 +--
> 1 file changed, 1 insertion(+), 2 deletions(-)
>
> diff --git a/net/sched/cls_matchall.c b/net/sched/cls_matchall.c
> index 2efb36c08f2a..dee469fed967 100644
> --- a/net/sched/cls_matchall.c
> +++ b/net/sched/cls_matchall.c
> @@ -203,8 +203,7 @@ static int mall_change(struct net *net, struct sk_buff *in_skb,
>
> *arg = (unsigned long) head;
> rcu_assign_pointer(tp->root, new);
> - if (head)
> - call_rcu(&head->rcu, mall_destroy_rcu);
> + call_rcu(&head->rcu, mall_destroy_rcu);
> return 0;
>
> err_replace_hw_filter:
if someone cares .. the err=0 in the the line above the patch is also useless
because err is never used again. Merging both if will save 1 indent level.
err = mall_replace_hw_filter(tp, new, (unsigned long) new);
if (err && tc_skip_sw(flags) )
goto errout;
just my impression,
re
wh
^ permalink raw reply [flat|nested] 5+ messages in thread* Re: [PATCH] net/sched: remove redundant null check on head
2017-05-03 14:21 ` walter harms
@ 2017-05-03 15:12 ` Jiri Pirko
0 siblings, 0 replies; 5+ messages in thread
From: Jiri Pirko @ 2017-05-03 15:12 UTC (permalink / raw)
To: walter harms
Cc: Colin King, Jamal Hadi Salim, Cong Wang, netdev, kernel-janitors
Wed, May 03, 2017 at 04:21:15PM CEST, wharms@bfs.de wrote:
>
>
>Am 03.05.2017 15:50, schrieb Colin King:
>> From: Colin Ian King <colin.king@canonical.com>
>>
>> head is previously null checked and so the 2nd null check on head
>> is redundant and therefore can be removed.
>>
>> Detected by CoverityScan, CID#1399505 ("Logically dead code")
>>
>> Signed-off-by: Colin Ian King <colin.king@canonical.com>
>> ---
>> net/sched/cls_matchall.c | 3 +--
>> 1 file changed, 1 insertion(+), 2 deletions(-)
>>
>> diff --git a/net/sched/cls_matchall.c b/net/sched/cls_matchall.c
>> index 2efb36c08f2a..dee469fed967 100644
>> --- a/net/sched/cls_matchall.c
>> +++ b/net/sched/cls_matchall.c
>> @@ -203,8 +203,7 @@ static int mall_change(struct net *net, struct sk_buff *in_skb,
>>
>> *arg = (unsigned long) head;
>> rcu_assign_pointer(tp->root, new);
>> - if (head)
>> - call_rcu(&head->rcu, mall_destroy_rcu);
>> + call_rcu(&head->rcu, mall_destroy_rcu);
>> return 0;
>>
>> err_replace_hw_filter:
>
>
>if someone cares .. the err=0 in the the line above the patch is also useless
>because err is never used again. Merging both if will save 1 indent level.
>
> err = mall_replace_hw_filter(tp, new, (unsigned long) new);
> if (err && tc_skip_sw(flags) )
> goto errout;
true, however unrelated to this patch :)
Please submit as a separate patch.
Thanks.
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH] net/sched: remove redundant null check on head
2017-05-03 13:50 [PATCH] net/sched: remove redundant null check on head Colin King
2017-05-03 14:15 ` Jiri Pirko
2017-05-03 14:21 ` walter harms
@ 2017-05-04 15:01 ` David Miller
2 siblings, 0 replies; 5+ messages in thread
From: David Miller @ 2017-05-04 15:01 UTC (permalink / raw)
To: colin.king
Cc: jhs, xiyou.wangcong, jiri, netdev, kernel-janitors, linux-kernel
From: Colin King <colin.king@canonical.com>
Date: Wed, 3 May 2017 14:50:40 +0100
> From: Colin Ian King <colin.king@canonical.com>
>
> head is previously null checked and so the 2nd null check on head
> is redundant and therefore can be removed.
>
> Detected by CoverityScan, CID#1399505 ("Logically dead code")
>
> Signed-off-by: Colin Ian King <colin.king@canonical.com>
Applied.
^ permalink raw reply [flat|nested] 5+ messages in thread
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2017-05-03 13:50 [PATCH] net/sched: remove redundant null check on head Colin King
2017-05-03 14:15 ` Jiri Pirko
2017-05-03 14:21 ` walter harms
2017-05-03 15:12 ` Jiri Pirko
2017-05-04 15:01 ` David Miller
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