diff options
Diffstat (limited to 'drivers/dca')
| -rw-r--r-- | drivers/dca/dca-core.c | 78 |
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); } |