[PATCH v4 1/4] tpm: migrate tpm2_shutdown() to use struct tpm_buf

Jarkko Sakkinen
2018-03-26T12:14:03Z

In order to make struct tpm_buf the first class object for constructing TPM
commands, migrate tpm2_shutdown() to use it. In addition, removed the klog
entry when tpm_transmit_cmd() fails because tpm_tansmit_cmd() already
prints an error message.

Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
---
drivers/char/tpm/tpm2-cmd.c | 44 ++++++++++++--------------------------------
1 file changed, 12 insertions(+), 32 deletions(-)

diff --git a/drivers/char/tpm/tpm2-cmd.c b/drivers/char/tpm/tpm2-cmd.c
index 96c77c8e7f40..7665661d9230 100644
--- a/drivers/char/tpm/tpm2-cmd.c
+++ b/drivers/char/tpm/tpm2-cmd.c
@@ -27,10 +27,6 @@ enum tpm2_session_attributes {
TPM2_SA_CONTINUE_SESSION = BIT(0),
};

-struct tpm2_startup_in {
- __be16 startup_type;
-} __packed;
-
struct tpm2_get_tpm_pt_in {
__be32 cap_id;
__be32 property_id;
@@ -55,7 +51,6 @@ struct tpm2_get_random_out {
} __packed;

union tpm2_cmd_params {
- struct tpm2_startup_in startup_in;
struct tpm2_get_tpm_pt_in get_tpm_pt_in;
struct tpm2_get_tpm_pt_out get_tpm_pt_out;
struct tpm2_get_random_in getrandom_in;
@@ -412,11 +407,8 @@ void tpm2_flush_context_cmd(struct tpm_chip *chip, u32 handle,
int rc;

rc = tpm_buf_init(&buf, TPM2_ST_NO_SESSIONS, TPM2_CC_FLUSH_CONTEXT);
- if (rc) {
- dev_warn(&chip->dev, "0x%08x was not flushed, out of memory\n",
- handle);
+ if (rc)
return;
- }

tpm_buf_append_u32(&buf, handle);

@@ -762,40 +754,28 @@ ssize_t tpm2_get_tpm_pt(struct tpm_chip *chip, u32 property_id, u32 *value,
}
EXPORT_SYMBOL_GPL(tpm2_get_tpm_pt);

-#define TPM2_SHUTDOWN_IN_SIZE \
- (sizeof(struct tpm_input_header) + \
- sizeof(struct tpm2_startup_in))
-
-static const struct tpm_input_header tpm2_shutdown_header = {
- .tag = cpu_to_be16(TPM2_ST_NO_SESSIONS),
- .length = cpu_to_be32(TPM2_SHUTDOWN_IN_SIZE),
- .ordinal = cpu_to_be32(TPM2_CC_SHUTDOWN)
-};
-
/**
* tpm2_shutdown() - send shutdown command to the TPM chip
*
+ * In places where shutdown command is sent there's no much we can do except
+ * print the error code on a system failure.
+ *
* @chip: TPM chip to use.
* @shutdown_type: shutdown type. The value is either
* TPM_SU_CLEAR or TPM_SU_STATE.
*/
void tpm2_shutdown(struct tpm_chip *chip, u16 shutdown_type)
{
- struct tpm2_cmd cmd;
+ struct tpm_buf buf;
int rc;

- cmd.header.in = tpm2_shutdown_header;
- cmd.params.startup_in.startup_type = cpu_to_be16(shutdown_type);
-
- rc = tpm_transmit_cmd(chip, NULL, &cmd, sizeof(cmd), 0, 0,
- "stopping the TPM");
-
- /* In places where shutdown command is sent there's no much we can do
- * except print the error code on a system failure.
- */
- if (rc < 0 && rc != -EPIPE)
- dev_warn(&chip->dev, "transmit returned %d while stopping the TPM",
- rc);
+ rc = tpm_buf_init(&buf, TPM2_ST_NO_SESSIONS, TPM2_CC_SHUTDOWN);
+ if (rc)
+ return;
+ tpm_buf_append_u16(&buf, shutdown_type);
+ tpm_transmit_cmd(chip, NULL, buf.data, PAGE_SIZE, 0, 0,
+ "stopping the TPM");
+ tpm_buf_destroy(&buf);
}

/*
--
2.15.1