[1/3] PCI: endpoint: Add 'started' to pci_epc to set whether the controller is started

Commit Message

Kunihiko Hayashi Oct. 2, 2020, 4:48 a.m. UTC

This adds a member 'started' as a boolean value to struct pci_epc to set
whether the controller is started, and also adds a function to get the
value.

Signed-off-by: Kunihiko Hayashi <[e-mail]>
---
 drivers/pci/endpoint/pci-epc-core.c | 2 ++
 include/linux/pci-epc.h             | 7 +++++++
 2 files changed, 9 insertions(+)

Patch

diff --git a/drivers/pci/endpoint/pci-epc-core.c b/drivers/pci/endpoint/pci-epc-core.c
index cadd3db..155be574 100644
--- a/drivers/pci/endpoint/pci-epc-core.c
+++ b/drivers/pci/endpoint/pci-epc-core.c
@@ -148,6 +148,7 @@  void pci_epc_stop(struct pci_epc *epc)
 
 	mutex_lock(&epc->lock);
 	epc->ops->stop(epc);
+	epc->started = false;
 	mutex_unlock(&epc->lock);
 }
 EXPORT_SYMBOL_GPL(pci_epc_stop);
@@ -170,6 +171,7 @@  int pci_epc_start(struct pci_epc *epc)
 
 	mutex_lock(&epc->lock);
 	ret = epc->ops->start(epc);
+	epc->started = true;
 	mutex_unlock(&epc->lock);
 
 	return ret;
diff --git a/include/linux/pci-epc.h b/include/linux/pci-epc.h
index cc66bec..d875d2d 100644
--- a/include/linux/pci-epc.h
+++ b/include/linux/pci-epc.h
@@ -107,6 +107,7 @@  struct pci_epc_mem {
  * @lock: mutex to protect pci_epc ops
  * @function_num_map: bitmap to manage physical function number
  * @notifier: used to notify EPF of any EPC events (like linkup)
+ * @started: true if this EPC is started
  */
 struct pci_epc {
 	struct device			dev;
@@ -121,6 +122,7 @@  struct pci_epc {
 	struct mutex			lock;
 	unsigned long			function_num_map;
 	struct atomic_notifier_head	notifier;
+	bool				started;
 };
 
 /**
@@ -167,6 +169,11 @@  pci_epc_register_notifier(struct pci_epc *epc, struct notifier_block *nb)
 	return atomic_notifier_chain_register(&epc->notifier, nb);
 }
 
+static inline bool pci_epc_is_started(struct pci_epc *epc)
+{
+	return epc->started;
+}
+
 struct pci_epc *
 __devm_pci_epc_create(struct device *dev, const struct pci_epc_ops *ops,
 		      struct module *owner);