tpm_tis: check pnp_acpi_device return code

Reported-by: Peter Hüwe <peterhuewe@gmx.de>
Reviewed-by: Peter Huewe <peterhuewe@gmx.de>
Signed-off-by: Kent Yoder <key@linux.vnet.ibm.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/char/tpm/tpm_tis.c b/drivers/char/tpm/tpm_tis.c
index 6c69ad72f82f..8a41b6be23a0 100644
--- a/drivers/char/tpm/tpm_tis.c
+++ b/drivers/char/tpm/tpm_tis.c
@@ -84,6 +84,9 @@ static int is_itpm(struct pnp_dev *dev)
         struct acpi_device *acpi = pnp_acpi_device(dev);
         struct acpi_hardware_id *id;
 
+        if (!acpi)
+                return 0;
+
         list_for_each_entry(id, &acpi->pnp.ids, list) {
                 if (!strcmp("INTC0102", id->id))
                         return 1;