This is a note to let you know that I've just added the patch titled

tpm: constify transmit data pointers

to the 4.9-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...

The filename of the patch is: tpm-constify-transmit-data-pointers.patch and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.

From c37fbc09bd4977736f6bc4050c6f099c587052a7 Mon Sep 17 00:00:00 2001

From: Arnd Bergmann arnd@arndb.de Date: Thu, 7 Sep 2017 15:30:45 +0200 Subject: tpm: constify transmit data pointers

From: Arnd Bergmann arnd@arndb.de

commit c37fbc09bd4977736f6bc4050c6f099c587052a7 upstream.

Making cmd_getticks 'const' introduced a couple of harmless warnings:

drivers/char/tpm/tpm_tis_core.c: In function 'probe_itpm': drivers/char/tpm/tpm_tis_core.c:469:31: error: passing argument 2 of 'tpm_tis_send_data' discards 'const' qualifier from pointer target type [-Werror=discarded-qualifiers] rc = tpm_tis_send_data(chip, cmd_getticks, len); drivers/char/tpm/tpm_tis_core.c:477:31: error: passing argument 2 of 'tpm_tis_send_data' discards 'const' qualifier from pointer target type [-Werror=discarded-qualifiers] rc = tpm_tis_send_data(chip, cmd_getticks, len); drivers/char/tpm/tpm_tis_core.c:255:12: note: expected 'u8 * {aka unsigned char *}' but argument is of type 'const u8 * {aka const unsigned char *}' static int tpm_tis_send_data(struct tpm_chip *chip, u8 *buf, size_t len)

This changes the related functions to all take 'const' pointers so that gcc can see this as being correct. I had to slightly modify the logic around tpm_tis_spi_transfer() for this to work without introducing ugly casts.

Cc: stable@vger.kernel.org Fixes: 5e35bd8e06b9 ("tpm_tis: make array cmd_getticks static const to shink object code size") Signed-off-by: Arnd Bergmann arnd@arndb.de Reviewed-by: Jarkko Sakkinen jarkko.sakkinen@linux.intel.com Tested-by: Jarkko Sakkinen jarkko.sakkinen@linux.intel.com Signed-off-by: Jarkko Sakkinen jarkko.sakkinen@linux.intel.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org

--- drivers/char/tpm/tpm_tis.c | 2 +- drivers/char/tpm/tpm_tis_core.c | 4 ++-- drivers/char/tpm/tpm_tis_core.h | 4 ++-- drivers/char/tpm/tpm_tis_spi.c | 25 +++++++++++-------------- 4 files changed, 16 insertions(+), 19 deletions(-)

--- a/drivers/char/tpm/tpm_tis.c +++ b/drivers/char/tpm/tpm_tis.c @@ -98,7 +98,7 @@ static int tpm_tcg_read_bytes(struct tpm }

static int tpm_tcg_write_bytes(struct tpm_tis_data *data, u32 addr, u16 len, - u8 *value) + const u8 *value) { struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(data);

--- a/drivers/char/tpm/tpm_tis_core.c +++ b/drivers/char/tpm/tpm_tis_core.c @@ -257,7 +257,7 @@ out: * tpm.c can skip polling for the data to be available as the interrupt is * waited for here */ -static int tpm_tis_send_data(struct tpm_chip *chip, u8 *buf, size_t len) +static int tpm_tis_send_data(struct tpm_chip *chip, const u8 *buf, size_t len) { struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev); int rc, status, burstcnt; @@ -346,7 +346,7 @@ static void disable_interrupts(struct tp * tpm.c can skip polling for the data to be available as the interrupt is * waited for here */ -static int tpm_tis_send_main(struct tpm_chip *chip, u8 *buf, size_t len) +static int tpm_tis_send_main(struct tpm_chip *chip, const u8 *buf, size_t len) { struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev); int rc; --- a/drivers/char/tpm/tpm_tis_core.h +++ b/drivers/char/tpm/tpm_tis_core.h @@ -98,7 +98,7 @@ struct tpm_tis_phy_ops { int (*read_bytes)(struct tpm_tis_data *data, u32 addr, u16 len, u8 *result); int (*write_bytes)(struct tpm_tis_data *data, u32 addr, u16 len, - u8 *value); + const u8 *value); int (*read16)(struct tpm_tis_data *data, u32 addr, u16 *result); int (*read32)(struct tpm_tis_data *data, u32 addr, u32 *result); int (*write32)(struct tpm_tis_data *data, u32 addr, u32 src); @@ -128,7 +128,7 @@ static inline int tpm_tis_read32(struct }

static inline int tpm_tis_write_bytes(struct tpm_tis_data *data, u32 addr, - u16 len, u8 *value) + u16 len, const u8 *value) { return data->phy_ops->write_bytes(data, addr, len, value); } --- a/drivers/char/tpm/tpm_tis_spi.c +++ b/drivers/char/tpm/tpm_tis_spi.c @@ -58,7 +58,7 @@ static inline struct tpm_tis_spi_phy *to }

static int tpm_tis_spi_transfer(struct tpm_tis_data *data, u32 addr, u16 len, - u8 *buffer, u8 direction) + u8 *in, const u8 *out) { struct tpm_tis_spi_phy *phy = to_tpm_tis_spi_phy(data); int ret = 0; @@ -72,7 +72,7 @@ static int tpm_tis_spi_transfer(struct t while (len) { transfer_len = min_t(u16, len, MAX_SPI_FRAMESIZE);

- phy->tx_buf[0] = direction | (transfer_len - 1); + phy->tx_buf[0] = (in ? 0x80 : 0) | (transfer_len - 1); phy->tx_buf[1] = 0xd4; phy->tx_buf[2] = addr >> 8; phy->tx_buf[3] = addr; @@ -113,14 +113,8 @@ static int tpm_tis_spi_transfer(struct t spi_xfer.cs_change = 0; spi_xfer.len = transfer_len; spi_xfer.delay_usecs = 5; - - if (direction) { - spi_xfer.tx_buf = NULL; - spi_xfer.rx_buf = buffer; - } else { - spi_xfer.tx_buf = buffer; - spi_xfer.rx_buf = NULL; - } + spi_xfer.tx_buf = out; + spi_xfer.rx_buf = in;

spi_message_init(&m); spi_message_add_tail(&spi_xfer, &m); @@ -129,7 +123,10 @@ static int tpm_tis_spi_transfer(struct t goto exit;

len -= transfer_len; - buffer += transfer_len; + if (in) + in += transfer_len; + if (out) + out += transfer_len; }

exit: @@ -140,13 +137,13 @@ exit: static int tpm_tis_spi_read_bytes(struct tpm_tis_data *data, u32 addr, u16 len, u8 *result) { - return tpm_tis_spi_transfer(data, addr, len, result, 0x80); + return tpm_tis_spi_transfer(data, addr, len, result, NULL); }

static int tpm_tis_spi_write_bytes(struct tpm_tis_data *data, u32 addr, - u16 len, u8 *value) + u16 len, const u8 *value) { - return tpm_tis_spi_transfer(data, addr, len, value, 0); + return tpm_tis_spi_transfer(data, addr, len, NULL, value); }

static int tpm_tis_spi_read16(struct tpm_tis_data *data, u32 addr, u16 *result)

Patches currently in stable-queue which might be from arnd@arndb.de are

queue-4.9/tpm-constify-transmit-data-pointers.patch