diff options
Diffstat (limited to 'drivers/pci/pci-label.c')
| -rw-r--r-- | drivers/pci/pci-label.c | 34 |
1 files changed, 18 insertions, 16 deletions
diff --git a/drivers/pci/pci-label.c b/drivers/pci/pci-label.c index f12dcd1dc208..0260b14c8d94 100644 --- a/drivers/pci/pci-label.c +++ b/drivers/pci/pci-label.c @@ -187,7 +187,6 @@ static const char device_label_dsm_uuid[] = { }; enum acpi_attr_enum { - ACPI_ATTR_NONE = 0, ACPI_ATTR_LABEL_SHOW, ACPI_ATTR_INDEX_SHOW, }; @@ -222,20 +221,16 @@ dsm_get_label(struct device *dev, char *buf, enum acpi_attr_enum attr) if (obj->type == ACPI_TYPE_PACKAGE && obj->package.count == 2 && tmp[0].type == ACPI_TYPE_INTEGER && tmp[1].type == ACPI_TYPE_STRING) { - len = tmp[0].integer.value; - if (buf) { - /* - * This second string element is optional even when - * this _DSM is implemented; when not implemented, - * this entry must return a null string. - */ - if (attr == ACPI_ATTR_INDEX_SHOW) - scnprintf(buf, PAGE_SIZE, "%llu\n", - tmp->integer.value); - else if (attr == ACPI_ATTR_LABEL_SHOW) - dsm_label_utf16s_to_utf8s(tmp + 1, buf); - len = strlen(buf) > 0 ? strlen(buf) : -1; - } + /* + * The second string element is optional even when + * this _DSM is implemented; when not implemented, + * this entry must return a null string. + */ + if (attr == ACPI_ATTR_INDEX_SHOW) + scnprintf(buf, PAGE_SIZE, "%llu\n", tmp->integer.value); + else if (attr == ACPI_ATTR_LABEL_SHOW) + dsm_label_utf16s_to_utf8s(tmp + 1, buf); + len = strlen(buf) > 0 ? strlen(buf) : -1; } ACPI_FREE(obj); @@ -246,7 +241,14 @@ dsm_get_label(struct device *dev, char *buf, enum acpi_attr_enum attr) static bool device_has_dsm(struct device *dev) { - return dsm_get_label(dev, NULL, ACPI_ATTR_NONE) > 0; + acpi_handle handle; + + handle = ACPI_HANDLE(dev); + if (!handle) + return false; + + return !!acpi_check_dsm(handle, device_label_dsm_uuid, 0x2, + 1 << DEVICE_LABEL_DSM); } static umode_t |