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@@ -28,7 +28,7 @@
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#include <linux/device.h>
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#include <linux/dca.h>
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-#define DCA_VERSION "1.4"
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+#define DCA_VERSION "1.8"
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MODULE_VERSION(DCA_VERSION);
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MODULE_LICENSE("GPL");
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@@ -60,16 +60,17 @@ int dca_add_requester(struct device *dev)
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{
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struct dca_provider *dca;
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int err, slot = -ENODEV;
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+ unsigned long flags;
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if (!dev)
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return -EFAULT;
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- spin_lock(&dca_lock);
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+ spin_lock_irqsave(&dca_lock, flags);
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/* check if the requester has not been added already */
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dca = dca_find_provider_by_dev(dev);
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if (dca) {
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- spin_unlock(&dca_lock);
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+ spin_unlock_irqrestore(&dca_lock, flags);
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return -EEXIST;
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}
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@@ -78,19 +79,21 @@ int dca_add_requester(struct device *dev)
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if (slot >= 0)
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break;
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}
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- if (slot < 0) {
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- spin_unlock(&dca_lock);
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+
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+ spin_unlock_irqrestore(&dca_lock, flags);
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+
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+ if (slot < 0)
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return slot;
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- }
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err = dca_sysfs_add_req(dca, dev, slot);
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if (err) {
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- dca->ops->remove_requester(dca, dev);
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- spin_unlock(&dca_lock);
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+ spin_lock_irqsave(&dca_lock, flags);
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+ if (dca == dca_find_provider_by_dev(dev))
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+ dca->ops->remove_requester(dca, dev);
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+ spin_unlock_irqrestore(&dca_lock, flags);
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return err;
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}
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- spin_unlock(&dca_lock);
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return 0;
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}
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EXPORT_SYMBOL_GPL(dca_add_requester);
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@@ -103,25 +106,25 @@ int dca_remove_requester(struct device *dev)
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{
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struct dca_provider *dca;
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int slot;
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+ unsigned long flags;
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if (!dev)
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return -EFAULT;
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- spin_lock(&dca_lock);
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+ spin_lock_irqsave(&dca_lock, flags);
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dca = dca_find_provider_by_dev(dev);
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if (!dca) {
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- spin_unlock(&dca_lock);
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+ spin_unlock_irqrestore(&dca_lock, flags);
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return -ENODEV;
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}
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slot = dca->ops->remove_requester(dca, dev);
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- if (slot < 0) {
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- spin_unlock(&dca_lock);
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+ spin_unlock_irqrestore(&dca_lock, flags);
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+
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+ if (slot < 0)
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return slot;
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- }
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dca_sysfs_remove_req(dca, slot);
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- spin_unlock(&dca_lock);
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return 0;
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}
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EXPORT_SYMBOL_GPL(dca_remove_requester);
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@@ -135,17 +138,18 @@ u8 dca_common_get_tag(struct device *dev, int cpu)
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{
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struct dca_provider *dca;
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u8 tag;
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+ unsigned long flags;
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- spin_lock(&dca_lock);
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+ spin_lock_irqsave(&dca_lock, flags);
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dca = dca_find_provider_by_dev(dev);
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if (!dca) {
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- spin_unlock(&dca_lock);
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+ spin_unlock_irqrestore(&dca_lock, flags);
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return -ENODEV;
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}
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tag = dca->ops->get_tag(dca, dev, cpu);
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- spin_unlock(&dca_lock);
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+ spin_unlock_irqrestore(&dca_lock, flags);
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return tag;
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}
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@@ -217,11 +221,16 @@ static BLOCKING_NOTIFIER_HEAD(dca_provider_chain);
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int register_dca_provider(struct dca_provider *dca, struct device *dev)
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{
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int err;
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+ unsigned long flags;
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err = dca_sysfs_add_provider(dca, dev);
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if (err)
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return err;
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+
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+ spin_lock_irqsave(&dca_lock, flags);
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list_add(&dca->node, &dca_providers);
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+ spin_unlock_irqrestore(&dca_lock, flags);
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+
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blocking_notifier_call_chain(&dca_provider_chain,
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DCA_PROVIDER_ADD, NULL);
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return 0;
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@@ -234,9 +243,15 @@ EXPORT_SYMBOL_GPL(register_dca_provider);
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*/
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void unregister_dca_provider(struct dca_provider *dca)
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{
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+ unsigned long flags;
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+
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blocking_notifier_call_chain(&dca_provider_chain,
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DCA_PROVIDER_REMOVE, NULL);
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+
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+ spin_lock_irqsave(&dca_lock, flags);
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list_del(&dca->node);
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+ spin_unlock_irqrestore(&dca_lock, flags);
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+
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dca_sysfs_remove_provider(dca);
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}
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EXPORT_SYMBOL_GPL(unregister_dca_provider);
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