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Subject[PATCH 12/13] tpm: st33: Remove chip->data_buffer access from this driver
Date
For some reason this driver thinks that chip->data_buffer needs
to be set before it can call tpm_pm_*. This is not true. data_buffer
is used only by /dev/tpmX, which is why it is managed exclusively
by the fops functions.

Cc: Mathias Leblanc <mathias.leblanc@st.com>
Signed-off-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
---
drivers/char/tpm/tpm_i2c_stm_st33.c | 8 --------
drivers/char/tpm/tpm_spi_stm_st33.c | 8 --------
2 files changed, 16 deletions(-)

diff --git a/drivers/char/tpm/tpm_i2c_stm_st33.c b/drivers/char/tpm/tpm_i2c_stm_st33.c
index cd8c3e3..cb39876 100644
--- a/drivers/char/tpm/tpm_i2c_stm_st33.c
+++ b/drivers/char/tpm/tpm_i2c_stm_st33.c
@@ -770,24 +770,18 @@ static int tpm_st33_i2c_remove(struct i2c_client *client)
#ifdef CONFIG_PM_SLEEP
/*
* tpm_st33_i2c_pm_suspend suspend the TPM device
- * Added: Work around when suspend and no tpm application is running, suspend
- * may fail because chip->data_buffer is not set (only set in tpm_open in Linux
- * TPM core)
* @param: client, the i2c_client drescription (TPM I2C description).
* @param: mesg, the power management message.
* @return: 0 in case of success.
*/
static int tpm_st33_i2c_pm_suspend(struct device *dev)
{
- struct tpm_chip *chip = dev_get_drvdata(dev);
struct st33zp24_platform_data *pin_infos = dev->platform_data;
int ret = 0;

if (power_mgt) {
gpio_set_value(pin_infos->io_lpcpd, 0);
} else {
- if (chip->data_buffer == NULL)
- chip->data_buffer = pin_infos->tpm_i2c_buffer[0];
ret = tpm_pm_suspend(dev);
}
return ret;
@@ -812,8 +806,6 @@ static int tpm_st33_i2c_pm_resume(struct device *dev)
TPM_STS_VALID) == TPM_STS_VALID,
chip->vendor.timeout_b);
} else {
- if (chip->data_buffer == NULL)
- chip->data_buffer = pin_infos->tpm_i2c_buffer[0];
ret = tpm_pm_resume(dev);
if (!ret)
tpm_do_selftest(chip);
diff --git a/drivers/char/tpm/tpm_spi_stm_st33.c b/drivers/char/tpm/tpm_spi_stm_st33.c
index 22f6e83..81c61f6 100644
--- a/drivers/char/tpm/tpm_spi_stm_st33.c
+++ b/drivers/char/tpm/tpm_spi_stm_st33.c
@@ -808,22 +808,16 @@ static int tpm_st33_spi_remove(struct spi_device *client)
#ifdef CONFIG_PM_SLEEP
/*
* tpm_st33_spi_pm_suspend suspend the TPM device
- * Added: Work around when suspend and no tpm application is running, suspend
- * may fail because chip->data_buffer is not set (only set in tpm_open in Linux
- * TPM core)
* @return: 0 in case of success.
*/
static int tpm_st33_spi_pm_suspend(struct device *dev)
{
- struct tpm_chip *chip = dev_get_drvdata(dev);
struct st33zp24_platform_data *pin_infos = dev->platform_data;
int ret = 0;

if (power_mgt)
gpio_set_value(pin_infos->io_lpcpd, 0);
else {
- if (chip->data_buffer == NULL)
- chip->data_buffer = pin_infos->tpm_spi_buffer[0];
ret = tpm_pm_suspend(dev);
}
return ret;
@@ -847,8 +841,6 @@ static int tpm_st33_spi_pm_resume(struct device *dev)
TPM_STS_VALID) == TPM_STS_VALID,
chip->vendor.timeout_b);
} else {
- if (chip->data_buffer == NULL)
- chip->data_buffer = pin_infos->tpm_spi_buffer[0];
ret = tpm_pm_resume(dev);
if (!ret)
tpm_do_selftest(chip);
--
1.8.1.2


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