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path: root/drivers/dca/dca-core.c
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Diffstat (limited to 'drivers/dca/dca-core.c')
-rw-r--r--drivers/dca/dca-core.c78
1 files changed, 44 insertions, 34 deletions
diff --git a/drivers/dca/dca-core.c b/drivers/dca/dca-core.c
index 4abd089a094f..25ec0bb05198 100644
--- a/drivers/dca/dca-core.c
+++ b/drivers/dca/dca-core.c
@@ -35,7 +35,7 @@ MODULE_VERSION(DCA_VERSION);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Intel Corporation");
-static DEFINE_SPINLOCK(dca_lock);
+static DEFINE_RAW_SPINLOCK(dca_lock);
static LIST_HEAD(dca_domains);
@@ -101,10 +101,10 @@ static void unregister_dca_providers(void)
INIT_LIST_HEAD(&unregistered_providers);
- spin_lock_irqsave(&dca_lock, flags);
+ raw_spin_lock_irqsave(&dca_lock, flags);
if (list_empty(&dca_domains)) {
- spin_unlock_irqrestore(&dca_lock, flags);
+ raw_spin_unlock_irqrestore(&dca_lock, flags);
return;
}
@@ -116,7 +116,7 @@ static void unregister_dca_providers(void)
dca_free_domain(domain);
- spin_unlock_irqrestore(&dca_lock, flags);
+ raw_spin_unlock_irqrestore(&dca_lock, flags);
list_for_each_entry_safe(dca, _dca, &unregistered_providers, node) {
dca_sysfs_remove_provider(dca);
@@ -144,13 +144,8 @@ static struct dca_domain *dca_get_domain(struct device *dev)
domain = dca_find_domain(rc);
if (!domain) {
- if (dca_provider_ioat_ver_3_0(dev) && !list_empty(&dca_domains)) {
+ if (dca_provider_ioat_ver_3_0(dev) && !list_empty(&dca_domains))
dca_providers_blocked = 1;
- } else {
- domain = dca_allocate_domain(rc);
- if (domain)
- list_add(&domain->node, &dca_domains);
- }
}
return domain;
@@ -198,19 +193,19 @@ int dca_add_requester(struct device *dev)
if (!dev)
return -EFAULT;
- spin_lock_irqsave(&dca_lock, flags);
+ raw_spin_lock_irqsave(&dca_lock, flags);
/* check if the requester has not been added already */
dca = dca_find_provider_by_dev(dev);
if (dca) {
- spin_unlock_irqrestore(&dca_lock, flags);
+ raw_spin_unlock_irqrestore(&dca_lock, flags);
return -EEXIST;
}
pci_rc = dca_pci_rc_from_dev(dev);
domain = dca_find_domain(pci_rc);
if (!domain) {
- spin_unlock_irqrestore(&dca_lock, flags);
+ raw_spin_unlock_irqrestore(&dca_lock, flags);
return -ENODEV;
}
@@ -220,17 +215,17 @@ int dca_add_requester(struct device *dev)
break;
}
- spin_unlock_irqrestore(&dca_lock, flags);
+ raw_spin_unlock_irqrestore(&dca_lock, flags);
if (slot < 0)
return slot;
err = dca_sysfs_add_req(dca, dev, slot);
if (err) {
- spin_lock_irqsave(&dca_lock, flags);
+ raw_spin_lock_irqsave(&dca_lock, flags);
if (dca == dca_find_provider_by_dev(dev))
dca->ops->remove_requester(dca, dev);
- spin_unlock_irqrestore(&dca_lock, flags);
+ raw_spin_unlock_irqrestore(&dca_lock, flags);
return err;
}
@@ -251,14 +246,14 @@ int dca_remove_requester(struct device *dev)
if (!dev)
return -EFAULT;
- spin_lock_irqsave(&dca_lock, flags);
+ raw_spin_lock_irqsave(&dca_lock, flags);
dca = dca_find_provider_by_dev(dev);
if (!dca) {
- spin_unlock_irqrestore(&dca_lock, flags);
+ raw_spin_unlock_irqrestore(&dca_lock, flags);
return -ENODEV;
}
slot = dca->ops->remove_requester(dca, dev);
- spin_unlock_irqrestore(&dca_lock, flags);
+ raw_spin_unlock_irqrestore(&dca_lock, flags);
if (slot < 0)
return slot;
@@ -280,16 +275,16 @@ u8 dca_common_get_tag(struct device *dev, int cpu)
u8 tag;
unsigned long flags;
- spin_lock_irqsave(&dca_lock, flags);
+ raw_spin_lock_irqsave(&dca_lock, flags);
dca = dca_find_provider_by_dev(dev);
if (!dca) {
- spin_unlock_irqrestore(&dca_lock, flags);
+ raw_spin_unlock_irqrestore(&dca_lock, flags);
return -ENODEV;
}
tag = dca->ops->get_tag(dca, dev, cpu);
- spin_unlock_irqrestore(&dca_lock, flags);
+ raw_spin_unlock_irqrestore(&dca_lock, flags);
return tag;
}
@@ -360,36 +355,51 @@ int register_dca_provider(struct dca_provider *dca, struct device *dev)
{
int err;
unsigned long flags;
- struct dca_domain *domain;
+ struct dca_domain *domain, *newdomain = NULL;
- spin_lock_irqsave(&dca_lock, flags);
+ raw_spin_lock_irqsave(&dca_lock, flags);
if (dca_providers_blocked) {
- spin_unlock_irqrestore(&dca_lock, flags);
+ raw_spin_unlock_irqrestore(&dca_lock, flags);
return -ENODEV;
}
- spin_unlock_irqrestore(&dca_lock, flags);
+ raw_spin_unlock_irqrestore(&dca_lock, flags);
err = dca_sysfs_add_provider(dca, dev);
if (err)
return err;
- spin_lock_irqsave(&dca_lock, flags);
+ raw_spin_lock_irqsave(&dca_lock, flags);
domain = dca_get_domain(dev);
if (!domain) {
+ struct pci_bus *rc;
+
if (dca_providers_blocked) {
- spin_unlock_irqrestore(&dca_lock, flags);
+ raw_spin_unlock_irqrestore(&dca_lock, flags);
dca_sysfs_remove_provider(dca);
unregister_dca_providers();
- } else {
- spin_unlock_irqrestore(&dca_lock, flags);
+ return -ENODEV;
+ }
+
+ raw_spin_unlock_irqrestore(&dca_lock, flags);
+ rc = dca_pci_rc_from_dev(dev);
+ newdomain = dca_allocate_domain(rc);
+ if (!newdomain)
+ return -ENODEV;
+ raw_spin_lock_irqsave(&dca_lock, flags);
+ /* Recheck, we might have raced after dropping the lock */
+ domain = dca_get_domain(dev);
+ if (!domain) {
+ domain = newdomain;
+ newdomain = NULL;
+ list_add(&domain->node, &dca_domains);
}
- return -ENODEV;
}
list_add(&dca->node, &domain->dca_providers);
- spin_unlock_irqrestore(&dca_lock, flags);
+ raw_spin_unlock_irqrestore(&dca_lock, flags);
blocking_notifier_call_chain(&dca_provider_chain,
DCA_PROVIDER_ADD, NULL);
+ kfree(newdomain);
return 0;
}
EXPORT_SYMBOL_GPL(register_dca_provider);
@@ -407,7 +417,7 @@ void unregister_dca_provider(struct dca_provider *dca, struct device *dev)
blocking_notifier_call_chain(&dca_provider_chain,
DCA_PROVIDER_REMOVE, NULL);
- spin_lock_irqsave(&dca_lock, flags);
+ raw_spin_lock_irqsave(&dca_lock, flags);
list_del(&dca->node);
@@ -416,7 +426,7 @@ void unregister_dca_provider(struct dca_provider *dca, struct device *dev)
if (list_empty(&domain->dca_providers))
dca_free_domain(domain);
- spin_unlock_irqrestore(&dca_lock, flags);
+ raw_spin_unlock_irqrestore(&dca_lock, flags);
dca_sysfs_remove_provider(dca);
}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-14 21:19:55 +0000