From: Zhengchao Shao Date: Mon, 29 Aug 2022 07:12:19 +0000 (+0800) Subject: net: sched: remove redundant NULL check in change hook function X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=a102c8973db7f7b7b6f75d51eed145d070438a49;p=linux.git net: sched: remove redundant NULL check in change hook function Currently, the change function can be called by two ways. The one way is that qdisc_change() will call it. Before calling change function, qdisc_change() ensures tca[TCA_OPTIONS] is not empty. The other way is that .init() will call it. The opt parameter is also checked before calling change function in .init(). Therefore, it's no need to check the input parameter opt in change function. Signed-off-by: Zhengchao Shao Acked-by: Toke Høiland-Jørgensen Link: https://lore.kernel.org/r/20220829071219.208646-1-shaozhengchao@huawei.com Signed-off-by: Paolo Abeni --- diff --git a/net/sched/sch_cake.c b/net/sched/sch_cake.c index a43a58a73d096..36acc95d611e5 100644 --- a/net/sched/sch_cake.c +++ b/net/sched/sch_cake.c @@ -2569,9 +2569,6 @@ static int cake_change(struct Qdisc *sch, struct nlattr *opt, struct nlattr *tb[TCA_CAKE_MAX + 1]; int err; - if (!opt) - return -EINVAL; - err = nla_parse_nested_deprecated(tb, TCA_CAKE_MAX, opt, cake_policy, extack); if (err < 0) diff --git a/net/sched/sch_codel.c b/net/sched/sch_codel.c index 30169b3adbbb0..d7a4874543de5 100644 --- a/net/sched/sch_codel.c +++ b/net/sched/sch_codel.c @@ -138,9 +138,6 @@ static int codel_change(struct Qdisc *sch, struct nlattr *opt, unsigned int qlen, dropped = 0; int err; - if (!opt) - return -EINVAL; - err = nla_parse_nested_deprecated(tb, TCA_CODEL_MAX, opt, codel_policy, NULL); if (err < 0) diff --git a/net/sched/sch_ets.c b/net/sched/sch_ets.c index 8de4365886e84..a3aea22ef09da 100644 --- a/net/sched/sch_ets.c +++ b/net/sched/sch_ets.c @@ -594,11 +594,6 @@ static int ets_qdisc_change(struct Qdisc *sch, struct nlattr *opt, unsigned int i; int err; - if (!opt) { - NL_SET_ERR_MSG(extack, "ETS options are required for this operation"); - return -EINVAL; - } - err = nla_parse_nested(tb, TCA_ETS_MAX, opt, ets_policy, extack); if (err < 0) return err; diff --git a/net/sched/sch_fq.c b/net/sched/sch_fq.c index 2fb76fc0cc31b..48d14fb90ba02 100644 --- a/net/sched/sch_fq.c +++ b/net/sched/sch_fq.c @@ -808,9 +808,6 @@ static int fq_change(struct Qdisc *sch, struct nlattr *opt, unsigned drop_len = 0; u32 fq_log; - if (!opt) - return -EINVAL; - err = nla_parse_nested_deprecated(tb, TCA_FQ_MAX, opt, fq_policy, NULL); if (err < 0) diff --git a/net/sched/sch_fq_codel.c b/net/sched/sch_fq_codel.c index 23a042adb74d8..f16f471daa810 100644 --- a/net/sched/sch_fq_codel.c +++ b/net/sched/sch_fq_codel.c @@ -372,9 +372,6 @@ static int fq_codel_change(struct Qdisc *sch, struct nlattr *opt, u32 quantum = 0; int err; - if (!opt) - return -EINVAL; - err = nla_parse_nested_deprecated(tb, TCA_FQ_CODEL_MAX, opt, fq_codel_policy, NULL); if (err < 0) diff --git a/net/sched/sch_fq_pie.c b/net/sched/sch_fq_pie.c index 35c35465226bd..6980796d435d9 100644 --- a/net/sched/sch_fq_pie.c +++ b/net/sched/sch_fq_pie.c @@ -283,9 +283,6 @@ static int fq_pie_change(struct Qdisc *sch, struct nlattr *opt, unsigned int num_dropped = 0; int err; - if (!opt) - return -EINVAL; - err = nla_parse_nested(tb, TCA_FQ_PIE_MAX, opt, fq_pie_policy, extack); if (err < 0) return err; diff --git a/net/sched/sch_gred.c b/net/sched/sch_gred.c index e7af53f607bbd..44af3b18eed90 100644 --- a/net/sched/sch_gred.c +++ b/net/sched/sch_gred.c @@ -648,9 +648,6 @@ static int gred_change(struct Qdisc *sch, struct nlattr *opt, u32 max_P; struct gred_sched_data *prealloc; - if (opt == NULL) - return -EINVAL; - err = nla_parse_nested_deprecated(tb, TCA_GRED_MAX, opt, gred_policy, extack); if (err < 0) diff --git a/net/sched/sch_hfsc.c b/net/sched/sch_hfsc.c index 03efc40e42fc4..c8bef923c79c0 100644 --- a/net/sched/sch_hfsc.c +++ b/net/sched/sch_hfsc.c @@ -1430,7 +1430,7 @@ hfsc_change_qdisc(struct Qdisc *sch, struct nlattr *opt, struct hfsc_sched *q = qdisc_priv(sch); struct tc_hfsc_qopt *qopt; - if (opt == NULL || nla_len(opt) < sizeof(*qopt)) + if (nla_len(opt) < sizeof(*qopt)) return -EINVAL; qopt = nla_data(opt); diff --git a/net/sched/sch_hhf.c b/net/sched/sch_hhf.c index 420ede8753229..d26cd436cbe31 100644 --- a/net/sched/sch_hhf.c +++ b/net/sched/sch_hhf.c @@ -516,9 +516,6 @@ static int hhf_change(struct Qdisc *sch, struct nlattr *opt, u32 new_quantum = q->quantum; u32 new_hhf_non_hh_weight = q->hhf_non_hh_weight; - if (!opt) - return -EINVAL; - err = nla_parse_nested_deprecated(tb, TCA_HHF_MAX, opt, hhf_policy, NULL); if (err < 0) diff --git a/net/sched/sch_netem.c b/net/sched/sch_netem.c index 5449ed114e406..b70ac04110dd5 100644 --- a/net/sched/sch_netem.c +++ b/net/sched/sch_netem.c @@ -961,9 +961,6 @@ static int netem_change(struct Qdisc *sch, struct nlattr *opt, int old_loss_model = CLG_RANDOM; int ret; - if (opt == NULL) - return -EINVAL; - qopt = nla_data(opt); ret = parse_attr(tb, TCA_NETEM_MAX, opt, netem_policy, sizeof(*qopt)); if (ret < 0) diff --git a/net/sched/sch_pie.c b/net/sched/sch_pie.c index 5a457ff61acd8..974038ba6c7b8 100644 --- a/net/sched/sch_pie.c +++ b/net/sched/sch_pie.c @@ -143,9 +143,6 @@ static int pie_change(struct Qdisc *sch, struct nlattr *opt, unsigned int qlen, dropped = 0; int err; - if (!opt) - return -EINVAL; - err = nla_parse_nested_deprecated(tb, TCA_PIE_MAX, opt, pie_policy, NULL); if (err < 0) diff --git a/net/sched/sch_plug.c b/net/sched/sch_plug.c index cbc2ebca4548c..ea8c4a7174bba 100644 --- a/net/sched/sch_plug.c +++ b/net/sched/sch_plug.c @@ -161,9 +161,6 @@ static int plug_change(struct Qdisc *sch, struct nlattr *opt, struct plug_sched_data *q = qdisc_priv(sch); struct tc_plug_qopt *msg; - if (opt == NULL) - return -EINVAL; - msg = nla_data(opt); if (nla_len(opt) < sizeof(*msg)) return -EINVAL; diff --git a/net/sched/sch_red.c b/net/sched/sch_red.c index f7ac40c0335ed..4952406f70b95 100644 --- a/net/sched/sch_red.c +++ b/net/sched/sch_red.c @@ -368,9 +368,6 @@ static int red_change(struct Qdisc *sch, struct nlattr *opt, struct nlattr *tb[TCA_RED_MAX + 1]; int err; - if (!opt) - return -EINVAL; - err = nla_parse_nested_deprecated(tb, TCA_RED_MAX, opt, red_policy, extack); if (err < 0)