linux-kernel - [RFC v2 1/3] acpiphp: extra debug hack

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Message-Id: <20230725151250.2287988-1-imammedo@redhat.com>
Date:   Tue, 25 Jul 2023 17:12:50 +0200
From:   Igor Mammedov <imammedo@...hat.com>
To:     linux-kernel@...r.kernel.org
Cc:     terraluna977@...il.com, bhelgaas@...gle.com,
        linux-pci@...r.kernel.org, imammedo@...hat.com, mst@...hat.com
Subject: [RFC v2 1/3] acpiphp: extra debug hack

v3:
drop recent debug line that probably causing crash

Signed-off-by: Igor Mammedov <imammedo@...hat.com>
---
 drivers/pci/hotplug/acpiphp_glue.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/pci/hotplug/acpiphp_glue.c b/drivers/pci/hotplug/acpiphp_glue.c
index 5b1f271c6034..ea8ed608f2a7 100644
--- a/drivers/pci/hotplug/acpiphp_glue.c
+++ b/drivers/pci/hotplug/acpiphp_glue.c
@@ -485,6 +485,7 @@ static void enable_slot(struct acpiphp_slot *slot, bool bridge)
 	struct pci_bus *bus = slot->bus;
 	struct acpiphp_func *func;
 
+pci_info(bus, "enable_slot bus: bridge: %d, bus->self: %p\n", bridge, bus->self);
 	if (bridge && bus->self && hotplug_is_native(bus->self)) {
 		/*
 		 * If native hotplug is used, it will take care of hotplug
@@ -544,6 +545,7 @@ static void enable_slot(struct acpiphp_slot *slot, bool bridge)
 		}
 		pci_dev_put(dev);
 	}
+pr_err("enable_slot: end\n");
 }
 
 /**
@@ -702,16 +704,20 @@ static void acpiphp_check_bridge(struct acpiphp_bridge *bridge)
 	if (bridge->is_going_away)
 		return;
 
-	if (bridge->pci_dev)
+	if (bridge->pci_dev) {
 		pm_runtime_get_sync(&bridge->pci_dev->dev);
+pci_info(bridge->pci_dev, "acpiphp_check_bridge\n");
+        }
 
 	list_for_each_entry(slot, &bridge->slots, node) {
 		struct pci_bus *bus = slot->bus;
 		struct pci_dev *dev, *tmp;
 
 		if (slot_no_hotplug(slot)) {
+pr_err("acpiphp_check_bridge: slot_no_hotplug\n");
 			; /* do nothing */
 		} else if (device_status_valid(get_slot_status(slot))) {
+pr_err("acpiphp_check_bridge: device_status_valid\n");
 			/* remove stale devices if any */
 			list_for_each_entry_safe_reverse(dev, tmp,
 							 &bus->devices, bus_list)
@@ -799,7 +805,7 @@ static void hotplug_event(u32 type, struct acpiphp_context *context)
 	switch (type) {
 	case ACPI_NOTIFY_BUS_CHECK:
 		/* bus re-enumerate */
-		acpi_handle_debug(handle, "Bus check in %s()\n", __func__);
+		acpi_handle_debug(handle, "Bus check in %s(): bridge: %p\n", __func__, bridge);
 		if (bridge)
 			acpiphp_check_bridge(bridge);
 		else if (!(slot->flags & SLOT_IS_GOING_AWAY))
-- 
2.39.3