LinuxLists.cc - [PATCH] tpm: make check

2017-03-18 09:10:48

Subject: [PATCH] tpm: make check_locality return bool

Since check_locality is checking to see if a certain
locality is active, return true if active otherwise
return false.

Cc: Christophe Ricard <[email protected]>
Cc: Jason Gunthorpe <[email protected]>
Cc: Marcel Selhorst <[email protected]>
Cc: Jarkko Sakkinen <[email protected]>
Cc: Peter Huewe <[email protected]>
Signed-off-by: Jerry Snitselaar <[email protected]>
---
Tested tpm_tis, but don't have the ability to
test Infineon or STMicro drivers.

drivers/char/tpm/st33zp24/st33zp24.c | 12 ++++++------
drivers/char/tpm/tpm_i2c_infineon.c | 12 ++++++------
drivers/char/tpm/tpm_tis_core.c | 20 +++++++++++---------
3 files changed, 23 insertions(+), 21 deletions(-)

diff --git a/drivers/char/tpm/st33zp24/st33zp24.c b/drivers/char/tpm/st33zp24/st33zp24.c
index e8e0f7c02686..4d1dc8b46877 100644
--- a/drivers/char/tpm/st33zp24/st33zp24.c
+++ b/drivers/char/tpm/st33zp24/st33zp24.c
@@ -117,9 +117,9 @@ static u8 st33zp24_status(struct tpm_chip *chip)
/*
* check_locality if the locality is active
* @param: chip, the tpm chip description
- * @return: the active locality or -EACCESS.
+ * @return: true if LOCALITY0 is active, otherwise false
*/
-static int check_locality(struct tpm_chip *chip)
+static bool check_locality(struct tpm_chip *chip)
{
struct st33zp24_dev *tpm_dev = dev_get_drvdata(&chip->dev);
u8 data;
@@ -129,9 +129,9 @@ static int check_locality(struct tpm_chip *chip)
if (status && (data &
(TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID)) ==
(TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID))
- return tpm_dev->locality;
+ return true;

- return -EACCES;
+ return false;
} /* check_locality() */

/*
@@ -146,7 +146,7 @@ static int request_locality(struct tpm_chip *chip)
long ret;
u8 data;

- if (check_locality(chip) == tpm_dev->locality)
+ if (check_locality(chip))
return tpm_dev->locality;

data = TPM_ACCESS_REQUEST_USE;
@@ -158,7 +158,7 @@ static int request_locality(struct tpm_chip *chip)

/* Request locality is usually effective after the request */
do {
- if (check_locality(chip) >= 0)
+ if (check_locality(chip))
return tpm_dev->locality;
msleep(TPM_TIMEOUT);
} while (time_before(jiffies, stop));
diff --git a/drivers/char/tpm/tpm_i2c_infineon.c b/drivers/char/tpm/tpm_i2c_infineon.c
index 62ee44e57ddc..dc47fa222a26 100644
--- a/drivers/char/tpm/tpm_i2c_infineon.c
+++ b/drivers/char/tpm/tpm_i2c_infineon.c
@@ -278,22 +278,22 @@ enum tis_defaults {
#define TPM_DATA_FIFO(l) (0x0005 | ((l) << 4))
#define TPM_DID_VID(l) (0x0006 | ((l) << 4))

-static int check_locality(struct tpm_chip *chip, int loc)
+static bool check_locality(struct tpm_chip *chip, int loc)
{
u8 buf;
int rc;

rc = iic_tpm_read(TPM_ACCESS(loc), &buf, 1);
if (rc < 0)
- return rc;
+ return false;

if ((buf & (TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID)) ==
(TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID)) {
tpm_dev.locality = loc;
- return loc;
+ return true;
}

- return -EIO;
+ return false;
}

/* implementation similar to tpm_tis */
@@ -315,7 +315,7 @@ static int request_locality(struct tpm_chip *chip, int loc)
unsigned long stop;
u8 buf = TPM_ACCESS_REQUEST_USE;

- if (check_locality(chip, loc) >= 0)
+ if (check_locality(chip, loc))
return loc;

iic_tpm_write(TPM_ACCESS(loc), &buf, 1);
@@ -323,7 +323,7 @@ static int request_locality(struct tpm_chip *chip, int loc)
/* wait for burstcount */
stop = jiffies + chip->timeout_a;
do {
- if (check_locality(chip, loc) >= 0)
+ if (check_locality(chip, loc))
return loc;
usleep_range(TPM_TIMEOUT_US_LOW, TPM_TIMEOUT_US_HI);
} while (time_before(jiffies, stop));
diff --git a/drivers/char/tpm/tpm_tis_core.c b/drivers/char/tpm/tpm_tis_core.c
index c0f296b5d413..93d641996249 100644
--- a/drivers/char/tpm/tpm_tis_core.c
+++ b/drivers/char/tpm/tpm_tis_core.c
@@ -56,7 +56,7 @@ static int wait_startup(struct tpm_chip *chip, int l)
return -1;
}

-static int check_locality(struct tpm_chip *chip, int l)
+static bool check_locality(struct tpm_chip *chip, int l)
{
struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
int rc;
@@ -64,13 +64,15 @@ static int check_locality(struct tpm_chip *chip, int l)

rc = tpm_tis_read8(priv, TPM_ACCESS(l), &access);
if (rc < 0)
- return rc;
+ return false;

if ((access & (TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID)) ==
- (TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID))
- return priv->locality = l;
+ (TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID)) {
+ priv->locality = l;
+ return true;
+ }

- return -1;
+ return false;
}

static void release_locality(struct tpm_chip *chip, int l, int force)
@@ -96,7 +98,7 @@ static int request_locality(struct tpm_chip *chip, int l)
unsigned long stop, timeout;
long rc;

- if (check_locality(chip, l) >= 0)
+ if (check_locality(chip, l))
return l;

rc = tpm_tis_write8(priv, TPM_ACCESS(l), TPM_ACCESS_REQUEST_USE);
@@ -112,7 +114,7 @@ static int request_locality(struct tpm_chip *chip, int l)
return -1;
rc = wait_event_interruptible_timeout(priv->int_queue,
(check_locality
- (chip, l) >= 0),
+ (chip, l)),
timeout);
if (rc > 0)
return l;
@@ -123,7 +125,7 @@ static int request_locality(struct tpm_chip *chip, int l)
} else {
/* wait for burstcount */
do {
- if (check_locality(chip, l) >= 0)
+ if (check_locality(chip, l))
return l;
msleep(TPM_TIMEOUT);
} while (time_before(jiffies, stop));
@@ -533,7 +535,7 @@ static irqreturn_t tis_int_handler(int dummy, void *dev_id)
wake_up_interruptible(&priv->read_queue);
if (interrupt & TPM_INTF_LOCALITY_CHANGE_INT)
for (i = 0; i < 5; i++)
- if (check_locality(chip, i) >= 0)
+ if (check_locality(chip, i))
break;
if (interrupt &
(TPM_INTF_LOCALITY_CHANGE_INT | TPM_INTF_STS_VALID_INT |
--
2.12.0.399.g9d77b0405ce6

2017-03-22 07:38:57

by Jarkko Sakkinen

[permalink] [raw]

Subject: Re: [PATCH] tpm: make check_locality return bool

On Sat, Mar 18, 2017 at 01:59:57AM -0700, Jerry Snitselaar wrote:
> Since check_locality is checking to see if a certain
> locality is active, return true if active otherwise
> return false.
>
> Cc: Christophe Ricard <[email protected]>
> Cc: Jason Gunthorpe <[email protected]>
> Cc: Marcel Selhorst <[email protected]>
> Cc: Jarkko Sakkinen <[email protected]>
> Cc: Peter Huewe <[email protected]>
> Signed-off-by: Jerry Snitselaar <[email protected]>
> ---
> Tested tpm_tis, but don't have the ability to
> test Infineon or STMicro drivers.

Does not matter as this one does not have connection to the used
hardware. I'll have to test this.

/Jarkko

>
> drivers/char/tpm/st33zp24/st33zp24.c | 12 ++++++------
> drivers/char/tpm/tpm_i2c_infineon.c | 12 ++++++------
> drivers/char/tpm/tpm_tis_core.c | 20 +++++++++++---------
> 3 files changed, 23 insertions(+), 21 deletions(-)
>
> diff --git a/drivers/char/tpm/st33zp24/st33zp24.c b/drivers/char/tpm/st33zp24/st33zp24.c
> index e8e0f7c02686..4d1dc8b46877 100644
> --- a/drivers/char/tpm/st33zp24/st33zp24.c
> +++ b/drivers/char/tpm/st33zp24/st33zp24.c
> @@ -117,9 +117,9 @@ static u8 st33zp24_status(struct tpm_chip *chip)
> /*
> * check_locality if the locality is active
> * @param: chip, the tpm chip description
> - * @return: the active locality or -EACCESS.
> + * @return: true if LOCALITY0 is active, otherwise false
> */
> -static int check_locality(struct tpm_chip *chip)
> +static bool check_locality(struct tpm_chip *chip)
> {
> struct st33zp24_dev *tpm_dev = dev_get_drvdata(&chip->dev);
> u8 data;
> @@ -129,9 +129,9 @@ static int check_locality(struct tpm_chip *chip)
> if (status && (data &
> (TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID)) ==
> (TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID))
> - return tpm_dev->locality;
> + return true;
>
> - return -EACCES;
> + return false;
> } /* check_locality() */
>
> /*
> @@ -146,7 +146,7 @@ static int request_locality(struct tpm_chip *chip)
> long ret;
> u8 data;
>
> - if (check_locality(chip) == tpm_dev->locality)
> + if (check_locality(chip))
> return tpm_dev->locality;
>
> data = TPM_ACCESS_REQUEST_USE;
> @@ -158,7 +158,7 @@ static int request_locality(struct tpm_chip *chip)
>
> /* Request locality is usually effective after the request */
> do {
> - if (check_locality(chip) >= 0)
> + if (check_locality(chip))
> return tpm_dev->locality;
> msleep(TPM_TIMEOUT);
> } while (time_before(jiffies, stop));
> diff --git a/drivers/char/tpm/tpm_i2c_infineon.c b/drivers/char/tpm/tpm_i2c_infineon.c
> index 62ee44e57ddc..dc47fa222a26 100644
> --- a/drivers/char/tpm/tpm_i2c_infineon.c
> +++ b/drivers/char/tpm/tpm_i2c_infineon.c
> @@ -278,22 +278,22 @@ enum tis_defaults {
> #define TPM_DATA_FIFO(l) (0x0005 | ((l) << 4))
> #define TPM_DID_VID(l) (0x0006 | ((l) << 4))
>
> -static int check_locality(struct tpm_chip *chip, int loc)
> +static bool check_locality(struct tpm_chip *chip, int loc)
> {
> u8 buf;
> int rc;
>
> rc = iic_tpm_read(TPM_ACCESS(loc), &buf, 1);
> if (rc < 0)
> - return rc;
> + return false;
>
> if ((buf & (TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID)) ==
> (TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID)) {
> tpm_dev.locality = loc;
> - return loc;
> + return true;
> }
>
> - return -EIO;
> + return false;
> }
>
> /* implementation similar to tpm_tis */
> @@ -315,7 +315,7 @@ static int request_locality(struct tpm_chip *chip, int loc)
> unsigned long stop;
> u8 buf = TPM_ACCESS_REQUEST_USE;
>
> - if (check_locality(chip, loc) >= 0)
> + if (check_locality(chip, loc))
> return loc;
>
> iic_tpm_write(TPM_ACCESS(loc), &buf, 1);
> @@ -323,7 +323,7 @@ static int request_locality(struct tpm_chip *chip, int loc)
> /* wait for burstcount */
> stop = jiffies + chip->timeout_a;
> do {
> - if (check_locality(chip, loc) >= 0)
> + if (check_locality(chip, loc))
> return loc;
> usleep_range(TPM_TIMEOUT_US_LOW, TPM_TIMEOUT_US_HI);
> } while (time_before(jiffies, stop));
> diff --git a/drivers/char/tpm/tpm_tis_core.c b/drivers/char/tpm/tpm_tis_core.c
> index c0f296b5d413..93d641996249 100644
> --- a/drivers/char/tpm/tpm_tis_core.c
> +++ b/drivers/char/tpm/tpm_tis_core.c
> @@ -56,7 +56,7 @@ static int wait_startup(struct tpm_chip *chip, int l)
> return -1;
> }
>
> -static int check_locality(struct tpm_chip *chip, int l)
> +static bool check_locality(struct tpm_chip *chip, int l)
> {
> struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
> int rc;
> @@ -64,13 +64,15 @@ static int check_locality(struct tpm_chip *chip, int l)
>
> rc = tpm_tis_read8(priv, TPM_ACCESS(l), &access);
> if (rc < 0)
> - return rc;
> + return false;
>
> if ((access & (TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID)) ==
> - (TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID))
> - return priv->locality = l;
> + (TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID)) {
> + priv->locality = l;
> + return true;
> + }
>
> - return -1;
> + return false;
> }
>
> static void release_locality(struct tpm_chip *chip, int l, int force)
> @@ -96,7 +98,7 @@ static int request_locality(struct tpm_chip *chip, int l)
> unsigned long stop, timeout;
> long rc;
>
> - if (check_locality(chip, l) >= 0)
> + if (check_locality(chip, l))
> return l;
>
> rc = tpm_tis_write8(priv, TPM_ACCESS(l), TPM_ACCESS_REQUEST_USE);
> @@ -112,7 +114,7 @@ static int request_locality(struct tpm_chip *chip, int l)
> return -1;
> rc = wait_event_interruptible_timeout(priv->int_queue,
> (check_locality
> - (chip, l) >= 0),
> + (chip, l)),
> timeout);
> if (rc > 0)
> return l;
> @@ -123,7 +125,7 @@ static int request_locality(struct tpm_chip *chip, int l)
> } else {
> /* wait for burstcount */
> do {
> - if (check_locality(chip, l) >= 0)
> + if (check_locality(chip, l))
> return l;
> msleep(TPM_TIMEOUT);
> } while (time_before(jiffies, stop));
> @@ -533,7 +535,7 @@ static irqreturn_t tis_int_handler(int dummy, void *dev_id)
> wake_up_interruptible(&priv->read_queue);
> if (interrupt & TPM_INTF_LOCALITY_CHANGE_INT)
> for (i = 0; i < 5; i++)
> - if (check_locality(chip, i) >= 0)
> + if (check_locality(chip, i))
> break;
> if (interrupt &
> (TPM_INTF_LOCALITY_CHANGE_INT | TPM_INTF_STS_VALID_INT |
> --
> 2.12.0.399.g9d77b0405ce6
>

2017-03-22 11:25:08

by Jarkko Sakkinen

[permalink] [raw]