PCI/portdrv: Remove unused resume err_handler

Commit 3e41a317 ("PCI/AER: Remove unused aer_error_resume()")
removed the resume err_handler from AER.  Since no other port service
implements the callback, support for it can be removed from portdrv.
It can be revived later if need be, preferably by re-using the
pcie_port_device_iter() iterator.

Link: https://lore.kernel.org/r/25334149b604e005058aeb0fdf51e01f991d5d74.1627638184.git.lukas@wunner.deSigned-off-by: Lukas Wunner <lukas@wunner.de>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Cc: Keith Busch <kbusch@kernel.org>

drivers/pci/pcie/portdrv.h

@@ -87,9 +87,6 @@ struct pcie_port_service_driver {
 
 	int (*slot_reset)(struct pcie_device *dev);
 
-	/* Device driver may resume normal operations */
-	void (*error_resume)(struct pci_dev *dev);
-
 	int port_type;  /* Type of the port this driver can handle */
 	u32 service;    /* Port service this device represents */
 

drivers/pci/pcie/portdrv_pci.c

@@ -173,29 +173,6 @@ static pci_ers_result_t pcie_portdrv_mmio_enabled(struct pci_dev *dev)
 	return PCI_ERS_RESULT_RECOVERED;
 }
 
-static int resume_iter(struct device *device, void *data)
-{
-	struct pcie_device *pcie_device;
-	struct pcie_port_service_driver *driver;
-
-	if (device->bus == &pcie_port_bus_type && device->driver) {
-		driver = to_service_driver(device->driver);
-		if (driver && driver->error_resume) {
-			pcie_device = to_pcie_device(device);
-
-			/* Forward error message to service drivers */
-			driver->error_resume(pcie_device->port);
-		}
-	}
-
-	return 0;
-}
-
-static void pcie_portdrv_err_resume(struct pci_dev *dev)
-{
-	device_for_each_child(&dev->dev, NULL, resume_iter);
-}
-
 /*
  * LINUX Device Driver Model
  */
@@ -213,7 +190,6 @@ static const struct pci_error_handlers pcie_portdrv_err_handler = {
 	.error_detected = pcie_portdrv_error_detected,
 	.slot_reset = pcie_portdrv_slot_reset,
 	.mmio_enabled = pcie_portdrv_mmio_enabled,
-	.resume = pcie_portdrv_err_resume,
 };
 
 static struct pci_driver pcie_portdriver = {