Commit 774820b3 authored by Bjorn Helgaas's avatar Bjorn Helgaas
Browse files

PCI/EDR: Add edr_handle_event() comments 

EDR documentation is a bit sketchy.  Add a couple comments to
edr_handle_event() about the devices involved.

Link: https://lore.kernel.org/r/20230407215259.GA3825733@bhelgaas


Signed-off-by: default avatarBjorn Helgaas <bhelgaas@google.com>
Reviewed-by: default avatarKuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
parent c441b1e0

drivers/pci/pcie/edr.c

+10 −1
Original line number Diff line number Diff line
@@ -151,9 +151,18 @@ static void edr_handle_event(acpi_handle handle, u32 event, void *data) 
	if (event != ACPI_NOTIFY_DISCONNECT_RECOVER)

		return;



	/*

	 * pdev is a Root Port or Downstream Port that is still present and

	 * has triggered a containment event, e.g., DPC, so its child

	 * devices have been disconnected (ACPI r6.5, sec 5.6.6).

	 */

	pci_info(pdev, "EDR event received\n");



	/* Locate the port which issued EDR event */

	/*

	 * Locate the port that experienced the containment event.  pdev

	 * may be that port or a parent of it (PCI Firmware r3.3, sec

	 * 4.6.13).

	 */

	edev = acpi_dpc_port_get(pdev);

	if (!edev) {

		pci_err(pdev, "Firmware failed to locate DPC port\n");