The ACPI PCI driver is leaking out memory mappings
when a slot is removed. Upon insertion following a
removal, we are hitting a BUG statement. Second call
to the remap API hits a bug statement because the area is
already mapped. This patch releases additional virtual
memory mapped by pci_remap_iospace function as part of
__release_pci_root_info function if the region type is IO.
BUG: failure at kernel/lib/ioremap.c:31/ioremap_pte_range()!
Kernel panic - not syncing: BUG!
CPU: 1 PID: 630 Comm: kworker/u48:3 Not tainted
Workqueue: kacpi_hotplug acpi_hotplug_work_fn Call trace:
dump_backtrace+0x0/0x10c [<ffff800000086e58>]
show_stack+0x10/0x1c [<ffff8000004d1f50>]
dump_stack+0x74/0xc4
panic+0xe4/0x21c [<ffff8000002577cc>]
ioremap_page_range+0x290/0x30c [<ffff8000002861dc>]
pci_remap_iospace+0x88/0xa0 [<ffff8000000908f8>]
setup_resource+0x114/0x16c [<ffff8000002c0fc0>]
acpi_walk_resource_buffer+0x54/0xb0
acpi_walk_resources+0x90/0xbc
pci_acpi_scan_root+0x184/0x2d0
acpi_pci_root_add+0x368/0x434
acpi_bus_attach+0x124/0x22c [<ffff8000002a5628>]
acpi_bus_scan+0x58/0x74 [<ffff8000002a57c0>]
acpi_device_hotplug+0xc4/0x3f0 [<ffff8000002a0468>]
acpi_hotplug_work_fn+0x1c/0x34 [<ffff8000000b9310>]
process_one_work+0x1e8/0x308 [<ffff8000000b9b04>]
worker_thread+0x294/0x3cc [<ffff8000000bd9
Signed-off-by: Sinan Kaya <okaya@xxxxxxxxxxxxxx>
---
drivers/acpi/pci_root.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c
index 71bbfae..6d4bc2d 100644
--- a/drivers/acpi/pci_root.c
+++ b/drivers/acpi/pci_root.c
@@ -946,6 +946,8 @@ static void acpi_pci_root_release_info(struct pci_host_bridge *bridge)
resource_list_for_each_entry(entry, &bridge->windows) {
res = entry->res;
+ if (res->flags & IORESOURCE_IO)
+ pci_unmap_iospace(res);
if (res->parent &&
(res->flags & (IORESOURCE_MEM | IORESOURCE_IO)))
release_resource(res);
--
1.8.2.1
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