vboot TPM stub functions return error codes

firmware/stub/tpm_lite_stub.c

Index: firmware/stub/tpm_lite_stub.c
diff --git a/firmware/stub/tpm_lite_stub.c b/firmware/stub/tpm_lite_stub.c
index 2695fae35d7136bec9a0d5ee080577588b52e6eb..57ef03ad9c9a0bf25137f719228f55964ff8332d 100644
--- a/firmware/stub/tpm_lite_stub.c
+++ b/firmware/stub/tpm_lite_stub.c
@@ -99,22 +99,23 @@ POSSIBLY_UNUSED static INLINE int TpmResponseSize(const uint8_t* buffer) {
 }
 
 
-void TlclStubInit(void) {
-  TlclOpenDevice();
+uint32_t TlclStubInit(void) {
+  return TlclOpenDevice();
 }
 
 
-void TlclCloseDevice(void) {
+uint32_t TlclCloseDevice(void) {
   close(tpm_fd);

[Randall Spangler, 2010/12/14 18:12:28]

if (tpm_fd != -1)
  close(tpm_fd);

(don't close if it's not open)

[Che-Liang Chiou, 2010/12/15 03:04:37]

Done.

   tpm_fd = -1;
+  return 0;
 }
 
 
-void TlclOpenDevice(void) {
+uint32_t TlclOpenDevice(void) {
   char* device_path;
 
   if (tpm_fd >= 0)
-    return;  /* Already open */
+    return 0;  /* Already open */
 
   device_path = getenv("TPM_DEVICE_PATH");
   if (device_path == NULL) {
@@ -124,7 +125,10 @@ void TlclOpenDevice(void) {
   tpm_fd = open(device_path, O_RDWR);
   if (tpm_fd < 0) {
     error("cannot open TPM device %s: %s\n", device_path, strerror(errno));
+    return TPM_E_IOERROR;
   }
+
+  return 0;
 }