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PCI/EDR: Add edr_handle_event() comments

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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: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
This commit is contained in:
Bjorn Helgaas 2023-04-07 12:19:46 -05:00
parent c441b1e03d
commit 774820b362
1 changed files with 10 additions and 1 deletions
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11
drivers/pci/pcie/edr.c
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@ -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");