From ac23d3cac1f339febd95c403a245ae072dfd0e84 Mon Sep 17 00:00:00 2001 From: Yasuaki Ishimatsu Date: Tue, 21 Mar 2017 11:44:25 -0400 Subject: [PATCH] fjes: Do not load fjes driver if system does not have extended socket device. The fjes driver is used only by FUJITSU servers and almost of all servers in the world never use it. But currently if ACPI PNP0C02 is defined in the ACPI table, the following message is always shown: "FUJITSU Extended Socket Network Device Driver - version 1.2 - Copyright (c) 2015 FUJITSU LIMITED" The message makes users confused because there is no reason that the message is shown in other vendor servers. To avoid the confusion, the patch adds a check that the server has a extended socket device or not. Signed-off-by: Yasuaki Ishimatsu CC: Taku Izumi Signed-off-by: David S. Miller --- drivers/net/fjes/fjes_main.c | 52 ++++++++++++++++++++++++++++++++---- 1 file changed, 47 insertions(+), 5 deletions(-) diff --git a/drivers/net/fjes/fjes_main.c b/drivers/net/fjes/fjes_main.c index c4b3c4b77a9c..7b589649ab46 100644 --- a/drivers/net/fjes/fjes_main.c +++ b/drivers/net/fjes/fjes_main.c @@ -45,6 +45,8 @@ MODULE_DESCRIPTION("FUJITSU Extended Socket Network Device Driver"); MODULE_LICENSE("GPL"); MODULE_VERSION(DRV_VERSION); +#define ACPI_MOTHERBOARD_RESOURCE_HID "PNP0C02" + static int fjes_request_irq(struct fjes_adapter *); static void fjes_free_irq(struct fjes_adapter *); @@ -78,7 +80,7 @@ static void fjes_rx_irq(struct fjes_adapter *, int); static int fjes_poll(struct napi_struct *, int); static const struct acpi_device_id fjes_acpi_ids[] = { - {"PNP0C02", 0}, + {ACPI_MOTHERBOARD_RESOURCE_HID, 0}, {"", 0}, }; MODULE_DEVICE_TABLE(acpi, fjes_acpi_ids); @@ -115,18 +117,17 @@ static struct resource fjes_resource[] = { }, }; -static int fjes_acpi_add(struct acpi_device *device) +static bool is_extended_socket_device(struct acpi_device *device) { struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL}; char str_buf[sizeof(FJES_ACPI_SYMBOL) + 1]; - struct platform_device *plat_dev; union acpi_object *str; acpi_status status; int result; status = acpi_evaluate_object(device->handle, "_STR", NULL, &buffer); if (ACPI_FAILURE(status)) - return -ENODEV; + return false; str = buffer.pointer; result = utf16s_to_utf8s((wchar_t *)str->string.pointer, @@ -136,10 +137,21 @@ static int fjes_acpi_add(struct acpi_device *device) if (strncmp(FJES_ACPI_SYMBOL, str_buf, strlen(FJES_ACPI_SYMBOL)) != 0) { kfree(buffer.pointer); - return -ENODEV; + return false; } kfree(buffer.pointer); + return true; +} + +static int fjes_acpi_add(struct acpi_device *device) +{ + struct platform_device *plat_dev; + acpi_status status; + + if (!is_extended_socket_device(device)) + return -ENODEV; + status = acpi_walk_resources(device->handle, METHOD_NAME__CRS, fjes_get_acpi_resource, fjes_resource); if (ACPI_FAILURE(status)) @@ -1473,11 +1485,41 @@ static void fjes_watch_unshare_task(struct work_struct *work) } } +static acpi_status +acpi_find_extended_socket_device(acpi_handle obj_handle, u32 level, + void *context, void **return_value) +{ + struct acpi_device *device; + bool *found = context; + int result; + + result = acpi_bus_get_device(obj_handle, &device); + if (result) + return AE_OK; + + if (strcmp(acpi_device_hid(device), ACPI_MOTHERBOARD_RESOURCE_HID)) + return AE_OK; + + if (!is_extended_socket_device(device)) + return AE_OK; + + *found = true; + return AE_CTRL_TERMINATE; +} + /* fjes_init_module - Driver Registration Routine */ static int __init fjes_init_module(void) { + bool found = false; int result; + acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, ACPI_UINT32_MAX, + acpi_find_extended_socket_device, NULL, &found, + NULL); + + if (!found) + return -ENODEV; + pr_info("%s - version %s - %s\n", fjes_driver_string, fjes_driver_version, fjes_copyright); -- 2.20.1