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authorVladimir Oltean <vladimir.oltean@nxp.com>2022-09-21 12:56:31 +0300
committerJakub Kicinski <kuba@kernel.org>2022-09-22 17:28:51 -0700
commita2c2a4ddc27db1715be8c03280c6cb7b808dd8b7 (patch)
tree8dc965854fcdd44dcc079e9bf13e43907622822b /net/sched/sch_taprio.c
parent03d25cf7a0e9e83448a67cd1e3c51712f3273984 (diff)
net/sched: taprio: remove unnecessary taprio_list_lock
The 3 functions that want access to the taprio_list: taprio_dev_notifier(), taprio_destroy() and taprio_init() are all called with the rtnl_mutex held, therefore implicitly serialized with respect to each other. A spin lock serves no purpose. Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com> Acked-by: Vinicius Costa Gomes <vinicius.gomes@intel.com> Link: https://lore.kernel.org/r/20220921095632.1379251-1-vladimir.oltean@nxp.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'net/sched/sch_taprio.c')
-rw-r--r--net/sched/sch_taprio.c7
1 files changed, 0 insertions, 7 deletions
diff --git a/net/sched/sch_taprio.c b/net/sched/sch_taprio.c
index 8ae454052201..1853f08b7b12 100644
--- a/net/sched/sch_taprio.c
+++ b/net/sched/sch_taprio.c
@@ -27,7 +27,6 @@
#include <net/tcp.h>
static LIST_HEAD(taprio_list);
-static DEFINE_SPINLOCK(taprio_list_lock);
#define TAPRIO_ALL_GATES_OPEN -1
@@ -1082,7 +1081,6 @@ static int taprio_dev_notifier(struct notifier_block *nb, unsigned long event,
if (event != NETDEV_UP && event != NETDEV_CHANGE)
return NOTIFY_DONE;
- spin_lock(&taprio_list_lock);
list_for_each_entry(q, &taprio_list, taprio_list) {
qdev = qdisc_dev(q->root);
if (qdev == dev) {
@@ -1090,7 +1088,6 @@ static int taprio_dev_notifier(struct notifier_block *nb, unsigned long event,
break;
}
}
- spin_unlock(&taprio_list_lock);
if (found)
taprio_set_picos_per_byte(dev, q);
@@ -1602,9 +1599,7 @@ static void taprio_destroy(struct Qdisc *sch)
struct sched_gate_list *oper, *admin;
unsigned int i;
- spin_lock(&taprio_list_lock);
list_del(&q->taprio_list);
- spin_unlock(&taprio_list_lock);
/* Note that taprio_reset() might not be called if an error
* happens in qdisc_create(), after taprio_init() has been called.
@@ -1653,9 +1648,7 @@ static int taprio_init(struct Qdisc *sch, struct nlattr *opt,
q->clockid = -1;
q->flags = TAPRIO_FLAGS_INVALID;
- spin_lock(&taprio_list_lock);
list_add(&q->taprio_list, &taprio_list);
- spin_unlock(&taprio_list_lock);
if (sch->parent != TC_H_ROOT) {
NL_SET_ERR_MSG_MOD(extack, "Can only be attached as root qdisc");