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Code Issues Releases Wiki Activity

maybe_cancel_validators() is always called locked

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there's no longer any need for a parameter to specify whether the
function is called while holding the bucket lock, because all
unlocked uses have been removed.
This commit is contained in:
Evan Hunt 2022-05-09 12:55:07 -07:00
parent e6baff35ac
commit f7fa139fe7
1 changed files with 8 additions and 18 deletions
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26
lib/dns/resolver.c
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@ -653,7 +653,7 @@ ncache_adderesult(dns_message_t *message, dns_db_t *cache, dns_dbnode_t *node,
static void
validated(isc_task_t *task, isc_event_t *event);
static void
maybe_cancel_validators(fetchctx_t *fctx, bool locked);
maybe_cancel_validators(fetchctx_t *fctx);
static void
add_bad(fetchctx_t *fctx, dns_message_t *rmessage, dns_adbaddrinfo_t *addrinfo,
isc_result_t reason, badnstype_t badtype);
@ -4247,7 +4247,7 @@ resume_qmin(isc_task_t *task, isc_event_t *event) {
LOCK(&res->buckets[bucketnum].lock);
if (SHUTTINGDOWN(fctx)) {
maybe_cancel_validators(fctx, true);
maybe_cancel_validators(fctx);
UNLOCK(&res->buckets[bucketnum].lock);
fctx_detach(&fctx);
return;
@ -5237,27 +5237,21 @@ clone_results(fetchctx_t *fctx) {
/*
* Cancel validators associated with '*fctx' if it is ready to be
* destroyed (i.e., no queries waiting for it and no pending ADB finds).
* Caller must hold fctx bucket lock.
*
* Requires:
* '*fctx' is shutting down.
*/
static void
maybe_cancel_validators(fetchctx_t *fctx, bool locked) {
unsigned int bucketnum;
dns_resolver_t *res = fctx->res;
dns_validator_t *validator, *next_validator;
bucketnum = fctx->bucketnum;
if (!locked) {
LOCK(&res->buckets[bucketnum].lock);
}
maybe_cancel_validators(fetchctx_t *fctx) {
dns_validator_t *validator = NULL, *next_validator = NULL;
REQUIRE(SHUTTINGDOWN(fctx));
if (atomic_load_acquire(&fctx->pending) != 0 ||
atomic_load_acquire(&fctx->nqueries) != 0)
{
goto unlock;
return;
}
for (validator = ISC_LIST_HEAD(fctx->validators); validator != NULL;
@ -5266,10 +5260,6 @@ maybe_cancel_validators(fetchctx_t *fctx, bool locked) {
next_validator = ISC_LIST_NEXT(validator, link);
dns_validator_cancel(validator);
}
unlock:
if (!locked) {
UNLOCK(&res->buckets[bucketnum].lock);
}
}
/*
@ -5707,7 +5697,7 @@ validated(isc_task_t *task, isc_event_t *event) {
*/
dns_db_detachnode(fctx->cache, &node);
if (SHUTTINGDOWN(fctx)) {
maybe_cancel_validators(fctx, true);
maybe_cancel_validators(fctx);
}
UNLOCK(&res->buckets[bucketnum].lock);
fctx_detach(&fctx);
@ -7314,7 +7304,7 @@ resume_dslookup(isc_task_t *task, isc_event_t *event) {
LOCK(&res->buckets[fctx->bucketnum].lock);
if (SHUTTINGDOWN(fctx)) {
maybe_cancel_validators(fctx, true);
maybe_cancel_validators(fctx);
UNLOCK(&res->buckets[fctx->bucketnum].lock);
if (dns_rdataset_isassociated(frdataset)) {