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WSL2-Linux-Kernel
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ipvs: change ip_vs_sched_lock to mutex 

The global list with schedulers ip_vs_schedulers
is accessed only from user context - configuration and
scheduler module [un]registration. Use ip_vs_sched_mutex
instead.

Signed-off-by: Julian Anastasov <ja@ssi.bg>
Signed-off-by: Simon Horman <horms@verge.net.au>
This commit is contained in:
Julian Anastasov 2013-03-22 11:46:36 +02:00 коммит произвёл Pablo Neira Ayuso
Родитель 9a05475ceb
Коммит 71dfa982f1
1 изменённых файлов: 12 добавлений и 12 удалений
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24
net/netfilter/ipvs/ip_vs_sched.c
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@ -35,8 +35,8 @@ EXPORT_SYMBOL(ip_vs_scheduler_err);
*/ */
static LIST_HEAD(ip_vs_schedulers); static LIST_HEAD(ip_vs_schedulers);
/* lock for service table */ /* semaphore for schedulers */
static DEFINE_SPINLOCK(ip_vs_sched_lock); static DEFINE_MUTEX(ip_vs_sched_mutex);
/* /*
@ -92,7 +92,7 @@ static struct ip_vs_scheduler *ip_vs_sched_getbyname(const char *sched_name)
IP_VS_DBG(2, "%s(): sched_name \"%s\"\n", __func__, sched_name); IP_VS_DBG(2, "%s(): sched_name \"%s\"\n", __func__, sched_name);
spin_lock_bh(&ip_vs_sched_lock); mutex_lock(&ip_vs_sched_mutex);
list_for_each_entry(sched, &ip_vs_schedulers, n_list) { list_for_each_entry(sched, &ip_vs_schedulers, n_list) {
/* /*
@ -106,14 +106,14 @@ static struct ip_vs_scheduler *ip_vs_sched_getbyname(const char *sched_name)
} }
if (strcmp(sched_name, sched->name)==0) { if (strcmp(sched_name, sched->name)==0) {
/* HIT */ /* HIT */
spin_unlock_bh(&ip_vs_sched_lock); mutex_unlock(&ip_vs_sched_mutex);
return sched; return sched;
} }
if (sched->module) if (sched->module)
module_put(sched->module); module_put(sched->module);
} }
spin_unlock_bh(&ip_vs_sched_lock); mutex_unlock(&ip_vs_sched_mutex);
return NULL; return NULL;
} }
@ -192,10 +192,10 @@ int register_ip_vs_scheduler(struct ip_vs_scheduler *scheduler)
/* increase the module use count */ /* increase the module use count */
ip_vs_use_count_inc(); ip_vs_use_count_inc();
spin_lock_bh(&ip_vs_sched_lock); mutex_lock(&ip_vs_sched_mutex);
if (!list_empty(&scheduler->n_list)) { if (!list_empty(&scheduler->n_list)) {
spin_unlock_bh(&ip_vs_sched_lock); mutex_unlock(&ip_vs_sched_mutex);
ip_vs_use_count_dec(); ip_vs_use_count_dec();
pr_err("%s(): [%s] scheduler already linked\n", pr_err("%s(): [%s] scheduler already linked\n",
__func__, scheduler->name); __func__, scheduler->name);
@ -208,7 +208,7 @@ int register_ip_vs_scheduler(struct ip_vs_scheduler *scheduler)
*/ */
list_for_each_entry(sched, &ip_vs_schedulers, n_list) { list_for_each_entry(sched, &ip_vs_schedulers, n_list) {
if (strcmp(scheduler->name, sched->name) == 0) { if (strcmp(scheduler->name, sched->name) == 0) {
spin_unlock_bh(&ip_vs_sched_lock); mutex_unlock(&ip_vs_sched_mutex);
ip_vs_use_count_dec(); ip_vs_use_count_dec();
pr_err("%s(): [%s] scheduler already existed " pr_err("%s(): [%s] scheduler already existed "
"in the system\n", __func__, scheduler->name); "in the system\n", __func__, scheduler->name);
@ -219,7 +219,7 @@ int register_ip_vs_scheduler(struct ip_vs_scheduler *scheduler)
* Add it into the d-linked scheduler list * Add it into the d-linked scheduler list
*/ */
list_add(&scheduler->n_list, &ip_vs_schedulers); list_add(&scheduler->n_list, &ip_vs_schedulers);
spin_unlock_bh(&ip_vs_sched_lock); mutex_unlock(&ip_vs_sched_mutex);
pr_info("[%s] scheduler registered.\n", scheduler->name); pr_info("[%s] scheduler registered.\n", scheduler->name);
@ -237,9 +237,9 @@ int unregister_ip_vs_scheduler(struct ip_vs_scheduler *scheduler)
return -EINVAL; return -EINVAL;
} }
spin_lock_bh(&ip_vs_sched_lock); mutex_lock(&ip_vs_sched_mutex);
if (list_empty(&scheduler->n_list)) { if (list_empty(&scheduler->n_list)) {
spin_unlock_bh(&ip_vs_sched_lock); mutex_unlock(&ip_vs_sched_mutex);
pr_err("%s(): [%s] scheduler is not in the list. failed\n", pr_err("%s(): [%s] scheduler is not in the list. failed\n",
__func__, scheduler->name); __func__, scheduler->name);
return -EINVAL; return -EINVAL;
@ -249,7 +249,7 @@ int unregister_ip_vs_scheduler(struct ip_vs_scheduler *scheduler)
* Remove it from the d-linked scheduler list * Remove it from the d-linked scheduler list
*/ */
list_del(&scheduler->n_list); list_del(&scheduler->n_list);
spin_unlock_bh(&ip_vs_sched_lock); mutex_unlock(&ip_vs_sched_mutex);
/* decrease the module use count */ /* decrease the module use count */
ip_vs_use_count_dec(); ip_vs_use_count_dec();