tpm: Cleanup tpm_continue_selftest

Cleanup the tpm_continue_selftest function.

Signed-off-by: Stefan Berger <stefanb@linux.vnet.ibm.com>

2 files changed, 24 insertions, 8 deletions

diff --git a/drivers/char/tpm/tpm.c b/drivers/char/tpm/tpm.c
index b6c4a320cfde..9bd4668e2855 100644
--- a/drivers/char/tpm/tpm.c
+++ b/drivers/char/tpm/tpm.c
@@ -611,15 +611,31 @@ duration:
 }
 EXPORT_SYMBOL_GPL(tpm_get_timeouts);
 
-void tpm_continue_selftest(struct tpm_chip *chip)
+#define TPM_ORD_CONTINUE_SELFTEST 83
+#define CONTINUE_SELFTEST_RESULT_SIZE 10
+
+static struct tpm_input_header continue_selftest_header = {
+        .tag = TPM_TAG_RQU_COMMAND,
+        .length = cpu_to_be32(10),
+        .ordinal = cpu_to_be32(TPM_ORD_CONTINUE_SELFTEST),
+};
+
+/**
+ * tpm_continue_selftest -- run TPM's selftest
+ * @chip: TPM chip to use
+ *
+ * Returns 0 on success, < 0 in case of fatal error or a value > 0 representing
+ * a TPM error code.
+ */
+int tpm_continue_selftest(struct tpm_chip *chip)
 {
-        u8 data[] = {
-                0, 193,                 /* TPM_TAG_RQU_COMMAND */
-                0, 0, 0, 10,            /* length */
-                0, 0, 0, 83,            /* TPM_ORD_ContinueSelfTest */
-        };
+        int rc;
+        struct tpm_cmd_t cmd;
 
-        tpm_transmit(chip, data, sizeof(data));
+        cmd.header.in = continue_selftest_header;
+        rc = transmit_cmd(chip, &cmd, CONTINUE_SELFTEST_RESULT_SIZE,
+                          "continue selftest");
+        return rc;
 }
 EXPORT_SYMBOL_GPL(tpm_continue_selftest);
 
diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h
index 4747b68c0c1b..5d2be8ae1b48 100644
--- a/drivers/char/tpm/tpm.h
+++ b/drivers/char/tpm/tpm.h
@@ -281,7 +281,7 @@ ssize_t	tpm_getcap(struct device *, __be32, cap_t *, const char *);
 
 extern int tpm_get_timeouts(struct tpm_chip *);
 extern void tpm_gen_interrupt(struct tpm_chip *);
-extern void tpm_continue_selftest(struct tpm_chip *);
+extern int tpm_continue_selftest(struct tpm_chip *);
 extern unsigned long tpm_calc_ordinal_duration(struct tpm_chip *, u32);
 extern struct tpm_chip* tpm_register_hardware(struct device *,
                                  const struct tpm_vendor_specific *);