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SubjectRE: [PATCH] net_sched: use explicit size of struct tcmsg, remove need to declare tcm
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From: Colin King
> Sent: 18 September 2017 12:41
> Pointer tcm is being initialized and is never read, it is only being used
> to determine the size of struct tcmsg. Clean this up by removing
> variable tcm and explicitly using the sizeof struct tcmsg rather than *tcm.
> Cleans up clang warning:
>
> warning: Value stored to 'tcm' during its initialization is never read
>
> Signed-off-by: Colin Ian King <colin.king@canonical.com>
> ---
> net/sched/sch_api.c | 3 +--
> 1 file changed, 1 insertion(+), 2 deletions(-)
>
> diff --git a/net/sched/sch_api.c b/net/sched/sch_api.c
> index c6deb74e3d2f..aa82116ed10c 100644
> --- a/net/sched/sch_api.c
> +++ b/net/sched/sch_api.c
> @@ -1500,7 +1500,6 @@ static int tc_dump_qdisc(struct sk_buff *skb, struct netlink_callback *cb)
> int s_idx, s_q_idx;
> struct net_device *dev;
> const struct nlmsghdr *nlh = cb->nlh;
> - struct tcmsg *tcm = nlmsg_data(nlh);
> struct nlattr *tca[TCA_MAX + 1];
> int err;
>
> @@ -1510,7 +1509,7 @@ static int tc_dump_qdisc(struct sk_buff *skb, struct netlink_callback *cb)
> idx = 0;
> ASSERT_RTNL();
>
> - err = nlmsg_parse(nlh, sizeof(*tcm), tca, TCA_MAX, NULL, NULL);
> + err = nlmsg_parse(nlh, sizeof(struct tcmsg), tca, TCA_MAX, NULL, NULL);

Would sizeof(*nlmsg_data(nlh)) be cleaner??

David

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