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Date: Tue, 14 Sep 2010 14:11:04 -0300
From: Rajiv Andrade <srajiv@...ux.vnet.ibm.com>
To: Joe Perches <joe@...ches.com>
Cc: Christophe Henri RICARD <christophe-h.ricard@...com>,
Marcel Selhorst <m.selhorst@...rix.com>,
Debora Velarde <debora@...ux.vnet.ibm.com>,
James Morris <jmorris@...ei.org>,
tpmdd-devel@...ts.sourceforge.net,
LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] drivers/char/tpm/tpm_stm_st19_i2c.c: Add missing
break and neatening
Chris, did you have the chance to test it against this specific TPM?
Despite this, the patch looks pretty good, thanks Joe.
Acked-by: Rajiv Andrade <srajiv@...ux.vnet.ibm.com>
On Fri, 2010-09-03 at 16:29 -0700, Joe Perches wrote:
> Add missing break in wait_until_good_shape
> Use init; while (test) loops not for(init;test;)
> Calculate bytes to transfer using if and min_t not multiple ?:
> Miscellaneous function whitespace aliging
>
> Signed-off-by: Joe Perches <joe@...ches.com>
> ---
> drivers/char/tpm/tpm_stm_st19_i2c.c | 158 +++++++++++++++++++----------------
> 1 files changed, 85 insertions(+), 73 deletions(-)
>
> diff --git a/drivers/char/tpm/tpm_stm_st19_i2c.c b/drivers/char/tpm/tpm_stm_st19_i2c.c
> index cdf2eb3..4b1ed05 100644
> --- a/drivers/char/tpm/tpm_stm_st19_i2c.c
> +++ b/drivers/char/tpm/tpm_stm_st19_i2c.c
> @@ -158,8 +158,10 @@ static int wait_until_good_shape(void)
> else if (!signal_pending(current)) {
> ret = schedule_timeout(time);
> wait_time += time;
> - } else
> + } else {
> ret = -ERESTARTSYS;
> + break;
> + }
> } while (1);
> finish_wait(&queue, &__wait);
>
> @@ -204,10 +206,10 @@ static int wait_event_interruptible_on_gpio(wait_queue_head_t queue,
> else if (wait_time >= timeout)
> break;
> else if (!signal_pending(current)) {
> - ret =
> - schedule_timeout(msecs_to_jiffies
> - (TICK_GPIO_SPOOLING));
> - wait_time += msecs_to_jiffies(TICK_GPIO_SPOOLING);
> + int time = msecs_to_jiffies(TICK_GPIO_SPOOLING);
> +
> + ret = schedule_timeout(time);
> + wait_time += time;
> } else {
> ret = -ERESTARTSYS;
> break;
> @@ -286,9 +288,9 @@ static int tpm_stm_i2c_send(struct tpm_chip *chip, unsigned char *buf,
> /* sending data (data_avail_pin hight) */
> /* If data are available, we read the data */
> init_waitqueue_head(&pin_infos->write_queue);
> - pin = wait_event_interruptible_on_gpio(pin_infos->write_queue,
> - tpm_calc_ordinal_duration
> - (chip, ordinal));
> + pin = wait_event_interruptible_on_gpio(
> + pin_infos->write_queue,
> + tpm_calc_ordinal_duration(chip, ordinal));
> if (pin < 0) {
> ret = pin;
> goto end;
> @@ -297,25 +299,30 @@ static int tpm_stm_i2c_send(struct tpm_chip *chip, unsigned char *buf,
> client->flags = I2C_M_RD;
>
> size = TPM_HEADER_SIZE;
> - for (i = 0; pin == DATA_ON && i < size;) {
> - ret = i2c_master_recv(client,
> - pin_infos->tpm_i2c_buffer[1],
> - (i == 0) ? TPM_HEADER_SIZE :
> - count - i > TPM_I2C_BLOCK_SIZE ?
> - TPM_I2C_BLOCK_SIZE : count - i);
> + i = 0;
> + while (i < size && pin == DATA_ON) {
> + int bytes;
> +
> + if (i == 0)
> + bytes = TPM_HEADER_SIZE;
> + else
> + bytes = min_t(int, count - i, TPM_I2C_BLOCK_SIZE);
> +
> + ret = i2c_master_recv(client, pin_infos->tpm_i2c_buffer[1],
> + bytes);
> if (ret < 0)
> goto end;
> - if (i == 0)
> - size =
> - responseSize(pin_infos->tpm_i2c_buffer[1], count);
> - (i == 0) ? (i += TPM_HEADER_SIZE) : (i += TPM_I2C_BLOCK_SIZE);
> + if (i == 0) {
> + size = responseSize(pin_infos->tpm_i2c_buffer[1],
> + count);
> + i += TPM_HEADER_SIZE;
> + } else
> + i += TPM_I2C_BLOCK_SIZE;
>
> if (i < size)
> - pin =
> - wait_event_interruptible_on_gpio(pin_infos->
> - write_queue,
> - msecs_to_jiffies
> - (TPM_I2C_SHORT));
> + pin = wait_event_interruptible_on_gpio(
> + pin_infos->write_queue,
> + msecs_to_jiffies(TPM_I2C_SHORT));
> }
>
> pin = wait_event_interruptible_on_gpio(pin_infos->write_queue,
> @@ -325,36 +332,41 @@ static int tpm_stm_i2c_send(struct tpm_chip *chip, unsigned char *buf,
> client->flags = 0;
>
> size = TPM_HEADER_SIZE;
> - for (i = 0; i < size && pin == COMMAND_ON;) {
> - memcpy(pin_infos->tpm_i2c_buffer[0], buf + i,
> - (i == 0) ? TPM_HEADER_SIZE : count - i >
> - TPM_I2C_BLOCK_SIZE ? TPM_I2C_BLOCK_SIZE : count - i);
> + i = 0;
> + while (i < size && pin == COMMAND_ON) {
> + int bytes;
> +
> + if (i == 0)
> + bytes = TPM_HEADER_SIZE;
> + else
> + bytes = min_t(int, count - i, TPM_I2C_BLOCK_SIZE);
> +
> + memcpy(pin_infos->tpm_i2c_buffer[0], buf + i, bytes);
>
> if (i == 0) {
> size = responseSize(buf, count);
> - size = (size < count ? size : count);
> + size = size < count ? size : count;
> }
> - ret =
> - i2c_master_send(client,
> - pin_infos->tpm_i2c_buffer[0],
> - count >= TPM_HEADER_SIZE ? (i ==
> - 0) ?
> - TPM_HEADER_SIZE : count - i >
> - TPM_I2C_BLOCK_SIZE ? TPM_I2C_BLOCK_SIZE :
> - count - i : count);
> +
> + if (count < TPM_HEADER_SIZE)
> + bytes = count;
> +
> + ret = i2c_master_send(client, pin_infos->tpm_i2c_buffer[0],
> + bytes);
> if (ret < 0) {
> pr_info("Failed to send data\n");
> goto end;
> }
>
> - (i == 0) ? (i += TPM_HEADER_SIZE) : (i += TPM_I2C_BLOCK_SIZE);
> + if (i == 0)
> + i += TPM_HEADER_SIZE;
> + else
> + i += TPM_I2C_BLOCK_SIZE;
> /* Wait for AcceptCmd signal hight */
> if (i < size)
> - pin =
> - wait_event_interruptible_on_gpio(pin_infos->
> - write_queue,
> - msecs_to_jiffies
> - (TPM_I2C_SHORT));
> + pin = wait_event_interruptible_on_gpio(
> + pin_infos->write_queue,
> + msecs_to_jiffies(TPM_I2C_SHORT));
>
> if (pin != COMMAND_ON) {
> pr_info("Failed to read gpio pin (AcceptCmd)\n");
> @@ -362,6 +374,7 @@ static int tpm_stm_i2c_send(struct tpm_chip *chip, unsigned char *buf,
> goto end;
> }
> }
> +
> if (i == 0) {
> pr_info("Failed to read gpio pin (AcceptCmd)\n");
> ret = -EIO;
> @@ -412,49 +425,48 @@ static int tpm_stm_i2c_recv(struct tpm_chip *chip, unsigned char *buf,
>
> /* Spool on the good gpio as long as pin GPIO 3 not HIGHT */
> init_waitqueue_head(&chip->vendor.read_queue);
> - pin = wait_event_interruptible_on_gpio(chip->vendor.read_queue,
> - tpm_calc_ordinal_duration
> - (chip, TPM_I2C_ORDINAL_LONG));
> + pin = wait_event_interruptible_on_gpio(
> + chip->vendor.read_queue,
> + tpm_calc_ordinal_duration(chip, TPM_I2C_ORDINAL_LONG));
>
> size = TPM_HEADER_SIZE;
> - for (i = 0; i < size && pin == DATA_ON;) {
> - ret =
> - i2c_master_recv(client,
> - pin_infos->tpm_i2c_buffer[1],
> - (count >= TPM_HEADER_SIZE ? i ==
> - 0 ? TPM_HEADER_SIZE : (size - i) >
> - TPM_I2C_BLOCK_SIZE ? TPM_I2C_BLOCK_SIZE :
> - size - i : count));
> + i = 0;
> + while (i < size && pin == DATA_ON) {
> + int bytes;
> +
> + if (count < TPM_HEADER_SIZE)
> + bytes = count;
> + else if (i == 0)
> + bytes = TPM_HEADER_SIZE;
> + else
> + bytes = min_t(int, size - i, TPM_I2C_BLOCK_SIZE);
> +
> + ret = i2c_master_recv(client, pin_infos->tpm_i2c_buffer[1],
> + bytes);
> if (ret < 0) {
> pr_info("Failed to read gpio pin (DataAvailable)\n");
> goto end;
> }
>
> - if (buf != NULL) {
> - memcpy(buf + i, pin_infos->tpm_i2c_buffer[1],
> - (count >= TPM_HEADER_SIZE ? i == 0 ?
> - TPM_HEADER_SIZE : (size - i) >
> - TPM_I2C_BLOCK_SIZE ? TPM_I2C_BLOCK_SIZE : size -
> - i : count));
> -
> - if (i == 0) {
> - size = responseSize(buf, size);
> - if (size > count)
> - size = count;
> - }
> - } else {
> + if (!buf) {
> pr_info("read buffer is NULL\n");
> goto end;
> }
>
> - (i == 0) ? (i += TPM_HEADER_SIZE) : (i += TPM_I2C_BLOCK_SIZE);
> + memcpy(buf + i, pin_infos->tpm_i2c_buffer[1], size);
> +
> + if (i == 0) {
> + size = responseSize(buf, size);
> + if (size > count)
> + size = count;
> + i += TPM_HEADER_SIZE;
> + } else
> + i += TPM_I2C_BLOCK_SIZE;
>
> if (i < size)
> - pin =
> - wait_event_interruptible_on_gpio(chip->vendor.
> - read_queue,
> - msecs_to_jiffies
> - (TPM_I2C_SHORT));
> + pin = wait_event_interruptible_on_gpio(
> + chip->vendor.read_queue,
> + msecs_to_jiffies(TPM_I2C_SHORT));
> }
>
> if (i == 0) {
> @@ -532,7 +544,7 @@ static ssize_t tpm_st19_i2c_ioctl(struct inode *inode, struct file *file,
> return -ENOSYS;
> case TPMIOC_TRANSMIT:
> if (copy_from_user(pin_infos->tpm_i2c_buffer[0],
> - (const char *)arg, TPM_HEADER_SIZE))
> + (const char *)arg, TPM_HEADER_SIZE))
> return -EFAULT;
> in_size = responseSize(pin_infos->tpm_i2c_buffer[0],
> TPM_HEADER_SIZE);
--
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