[PATCH -next 7/8] pci: aspm: add settings changed callback

[Stanislaw Gruszka <sgruszka@redhat.com>]

Inform drivers that register pci_drviver->aspm_changed(), about new ASPM
settings. Callback is only called for child (endpoint) devices.

Currently this will be used in ath9k driver. In the future we most
likely will use it in iwlwifi and rtlwifi drivers and possibly some
others that needs to do own ASPM related quirks.

Cc: Jesse Barnes <jbarnes@virtuousgeek.org>
Cc: linux-pci@vger.kernel.org
Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com>
---
 drivers/pci/pcie/aspm.c |    5 ++++-
 include/linux/pci.h     |    3 +++
 2 files changed, 7 insertions(+), 1 deletions(-)

diff --git a/drivers/pci/pcie/aspm.c b/drivers/pci/pcie/aspm.c
index 2883fc3..d7acec8 100644
--- a/drivers/pci/pcie/aspm.c
+++ b/drivers/pci/pcie/aspm.c
@@ -474,8 +474,11 @@ static void pcie_config_aspm_link(struct pcie_link_state *link, u32 state)
 	 */
 	if (state & ASPM_STATE_L1)
 		pcie_config_aspm_dev(parent, upstream);
-	list_for_each_entry(child, &linkbus->devices, bus_list)
+	list_for_each_entry(child, &linkbus->devices, bus_list) {
 		pcie_config_aspm_dev(child, dwstream);
+		if (child->driver && child->driver->aspm_changed)
+			child->driver->aspm_changed(child, dwstream);
+	}
 	if (!(state & ASPM_STATE_L1))
 		pcie_config_aspm_dev(parent, upstream);
 
diff --git a/include/linux/pci.h b/include/linux/pci.h
index c446b5c..2110d63 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -555,6 +555,9 @@ struct pci_driver {
 	int  (*resume_early) (struct pci_dev *dev);
 	int  (*resume) (struct pci_dev *dev);	                /* Device woken up */
 	void (*shutdown) (struct pci_dev *dev);
+#ifdef CONFIG_PCIEASPM
+	void (*aspm_changed) (struct pci_dev *dev, u32 state);
+#endif
 	struct pci_error_handlers *err_handler;
 	struct device_driver	driver;
 	struct pci_dynids dynids;
-- 
1.7.1