diff options
| -rw-r--r-- | drivers/char/tpm/tpm_tis.c | 48 |
1 files changed, 18 insertions, 30 deletions
diff --git a/drivers/char/tpm/tpm_tis.c b/drivers/char/tpm/tpm_tis.c index d993fed51f23..2ccad8a8177f 100644 --- a/drivers/char/tpm/tpm_tis.c +++ b/drivers/char/tpm/tpm_tis.c @@ -121,39 +121,11 @@ static inline int is_itpm(struct acpi_device *dev) { return has_hid(dev, "INTC0102"); } - -static inline int is_fifo(struct acpi_device *dev) -{ - struct acpi_table_tpm2 *tbl; - acpi_status st; - - /* TPM 1.2 FIFO */ - if (!has_hid(dev, "MSFT0101")) - return 1; - - st = acpi_get_table(ACPI_SIG_TPM2, 1, - (struct acpi_table_header **) &tbl); - if (ACPI_FAILURE(st)) { - dev_err(&dev->dev, "failed to get TPM2 ACPI table\n"); - return 0; - } - - if (tbl->start_method != ACPI_TPM2_MEMORY_MAPPED) - return 0; - - /* TPM 2.0 FIFO */ - return 1; -} #else static inline int is_itpm(struct acpi_device *dev) { return 0; } - -static inline int is_fifo(struct acpi_device *dev) -{ - return 1; -} #endif /* Before we attempt to access the TPM we must see that the valid bit is set. @@ -979,11 +951,21 @@ static int tpm_check_resource(struct acpi_resource *ares, void *data) static int tpm_tis_acpi_init(struct acpi_device *acpi_dev) { + struct acpi_table_tpm2 *tbl; + acpi_status st; struct list_head resources; - struct tpm_info tpm_info = tis_default_info; + struct tpm_info tpm_info = {}; int ret; - if (!is_fifo(acpi_dev)) + st = acpi_get_table(ACPI_SIG_TPM2, 1, + (struct acpi_table_header **) &tbl); + if (ACPI_FAILURE(st) || tbl->header.length < sizeof(*tbl)) { + dev_err(&acpi_dev->dev, + FW_BUG "failed to get TPM2 ACPI table\n"); + return -EINVAL; + } + + if (tbl->start_method != ACPI_TPM2_MEMORY_MAPPED) return -ENODEV; INIT_LIST_HEAD(&resources); @@ -995,6 +977,12 @@ static int tpm_tis_acpi_init(struct acpi_device *acpi_dev) acpi_dev_free_resource_list(&resources); + if (tpm_info.start == 0 && tpm_info.len == 0) { + dev_err(&acpi_dev->dev, + FW_BUG "TPM2 ACPI table does not define a memory resource\n"); + return -EINVAL; + } + if (is_itpm(acpi_dev)) itpm = true; |