Since the number of handles is fixed to a single handle, eliminate all uses of buf->handles and deduce values during compile-time.
Signed-off-by: Jarkko Sakkinen <[email protected]> --- v2: - Streamline the code change and remove dead code. --- drivers/char/tpm/tpm-buf.c | 25 ------------------------- drivers/char/tpm/tpm2-cmd.c | 6 ++---- drivers/char/tpm/tpm2-sessions.c | 14 ++------------ include/linux/tpm.h | 2 -- 4 files changed, 4 insertions(+), 43 deletions(-) diff --git a/drivers/char/tpm/tpm-buf.c b/drivers/char/tpm/tpm-buf.c index 73be8a87b472..752c69b8a4f5 100644 --- a/drivers/char/tpm/tpm-buf.c +++ b/drivers/char/tpm/tpm-buf.c @@ -40,7 +40,6 @@ static void __tpm_buf_reset(struct tpm_buf *buf, u16 buf_size, u16 tag, u32 ordi buf->flags = 0; buf->length = sizeof(*head); buf->capacity = buf_size - sizeof(*buf); - buf->handles = 0; head->tag = cpu_to_be16(tag); head->length = cpu_to_be32(sizeof(*head)); head->ordinal = cpu_to_be32(ordinal); @@ -56,7 +55,6 @@ static void __tpm_buf_reset_sized(struct tpm_buf *buf, u16 buf_size) buf->flags = TPM_BUF_TPM2B; buf->length = 2; buf->capacity = buf_size - sizeof(*buf); - buf->handles = 0; buf->data[0] = 0; buf->data[1] = 0; } @@ -177,29 +175,6 @@ void tpm_buf_append_u32(struct tpm_buf *buf, const u32 value) } EXPORT_SYMBOL_GPL(tpm_buf_append_u32); -/** - * tpm_buf_append_handle() - Add a handle - * @buf: &tpm_buf instance - * @handle: a TPM object handle - * - * Add a handle to the buffer, and increase the count tracking the number of - * handles in the command buffer. Works only for command buffers. - */ -void tpm_buf_append_handle(struct tpm_buf *buf, u32 handle) -{ - if (buf->flags & TPM_BUF_INVALID) - return; - - if (buf->flags & TPM_BUF_TPM2B) { - WARN(1, "tpm-buf: invalid type: TPM2B\n"); - buf->flags |= TPM_BUF_INVALID; - return; - } - - tpm_buf_append_u32(buf, handle); - buf->handles++; -} - /** * tpm_buf_read() - Read from a TPM buffer * @buf: &tpm_buf instance diff --git a/drivers/char/tpm/tpm2-cmd.c b/drivers/char/tpm/tpm2-cmd.c index 436ee82620e4..bc50d6b734cf 100644 --- a/drivers/char/tpm/tpm2-cmd.c +++ b/drivers/char/tpm/tpm2-cmd.c @@ -205,7 +205,7 @@ int tpm2_pcr_extend(struct tpm_chip *chip, u32 pcr_idx, return rc; tpm_buf_append_hmac_session(chip, buf, 0, NULL, 0); } else { - tpm_buf_append_handle(buf, pcr_idx); + tpm_buf_append_u32(buf, pcr_idx); tpm_buf_append_auth(chip, buf, NULL, 0); } @@ -281,10 +281,8 @@ int tpm2_get_random(struct tpm_chip *chip, u8 *dest, size_t max) TPM2_SA_CONTINUE_SESSION, NULL, 0); } else { - offset = buf->handles * 4 + TPM_HEADER_SIZE; head = (struct tpm_header *)buf->data; - if (tpm_buf_length(buf) == offset) - head->tag = cpu_to_be16(TPM2_ST_NO_SESSIONS); + head->tag = cpu_to_be16(TPM2_ST_NO_SESSIONS); } tpm_buf_append_u16(buf, num_bytes); err = tpm_buf_fill_hmac_session(chip, buf); diff --git a/drivers/char/tpm/tpm2-sessions.c b/drivers/char/tpm/tpm2-sessions.c index 62a200ae72d7..f2b8ca893e15 100644 --- a/drivers/char/tpm/tpm2-sessions.c +++ b/drivers/char/tpm/tpm2-sessions.c @@ -261,7 +261,7 @@ int tpm_buf_append_name(struct tpm_chip *chip, struct tpm_buf *buf, } if (!tpm2_chip_auth(chip)) { - tpm_buf_append_handle(buf, handle); + tpm_buf_append_u32(buf, handle); return 0; } @@ -288,17 +288,7 @@ EXPORT_SYMBOL_GPL(tpm_buf_append_name); void tpm_buf_append_auth(struct tpm_chip *chip, struct tpm_buf *buf, u8 *passphrase, int passphrase_len) { - /* offset tells us where the sessions area begins */ - int offset = buf->handles * 4 + TPM_HEADER_SIZE; - u32 len = 9 + passphrase_len; - - if (tpm_buf_length(buf) != offset) { - /* not the first session so update the existing length */ - len += get_unaligned_be32(&buf->data[offset]); - put_unaligned_be32(len, &buf->data[offset]); - } else { - tpm_buf_append_u32(buf, len); - } + tpm_buf_append_u32(buf, 9 + passphrase_len); /* auth handle */ tpm_buf_append_u32(buf, TPM2_RS_PW); /* nonce */ diff --git a/include/linux/tpm.h b/include/linux/tpm.h index 9f684fc7ae04..e68995df8796 100644 --- a/include/linux/tpm.h +++ b/include/linux/tpm.h @@ -395,7 +395,6 @@ enum tpm_buf_flags { */ struct tpm_buf { u8 flags; - u8 handles; u16 length; u16 capacity; u8 data[]; @@ -441,7 +440,6 @@ void tpm_buf_append_u32(struct tpm_buf *buf, const u32 value); u8 tpm_buf_read_u8(struct tpm_buf *buf, off_t *offset); u16 tpm_buf_read_u16(struct tpm_buf *buf, off_t *offset); u32 tpm_buf_read_u32(struct tpm_buf *buf, off_t *offset); -void tpm_buf_append_handle(struct tpm_buf *buf, u32 handle); /* * Check if TPM device is in the firmware upgrade mode. -- 2.39.5
