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Message-ID: <20190209182022.zghnna3fa3a3x3w7@cantor>
Date: Sat, 9 Feb 2019 11:20:22 -0700
From: Jerry Snitselaar <jsnitsel@...hat.com>
To: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
Cc: linux-integrity@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-security-module@...r.kernel.org,
Peter Huewe <PeterHuewe@....de>,
Jason Gunthorpe <jgg@...pe.ca>,
Stefan Berger <stefanb@...ux.vnet.ibm.com>,
Alexander Steffen <Alexander.Steffen@...ineon.com>,
stable@...r.kernel.org
Subject: Re: [PATCH v4 1/2] tpm: Unify the send callback behaviour
On Fri Feb 08 19, Jarkko Sakkinen wrote:
>The send() callback should never return length as it does not in every
>driver except tpm_crb in the success case. The reason is that the main
>transmit functionality only cares about whether the transmit was
>successful or not and ignores the count completely.
>
>Cc: stable@...r.kernel.org
>Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
>---
> drivers/char/tpm/st33zp24/st33zp24.c | 2 +-
> drivers/char/tpm/tpm_atmel.c | 2 +-
> drivers/char/tpm/tpm_i2c_atmel.c | 6 +++++-
> drivers/char/tpm/tpm_i2c_infineon.c | 2 +-
> drivers/char/tpm/tpm_i2c_nuvoton.c | 2 +-
> drivers/char/tpm/tpm_ibmvtpm.c | 8 ++++----
> drivers/char/tpm/tpm_infineon.c | 2 +-
> drivers/char/tpm/tpm_nsc.c | 2 +-
> drivers/char/tpm/tpm_tis_core.c | 2 +-
> drivers/char/tpm/tpm_vtpm_proxy.c | 3 +--
> drivers/char/tpm/xen-tpmfront.c | 2 +-
> 11 files changed, 18 insertions(+), 15 deletions(-)
>
>diff --git a/drivers/char/tpm/st33zp24/st33zp24.c b/drivers/char/tpm/st33zp24/st33zp24.c
>index 64dc560859f2..13dc614b7ebc 100644
>--- a/drivers/char/tpm/st33zp24/st33zp24.c
>+++ b/drivers/char/tpm/st33zp24/st33zp24.c
>@@ -436,7 +436,7 @@ static int st33zp24_send(struct tpm_chip *chip, unsigned char *buf,
> goto out_err;
> }
>
>- return len;
>+ return 0;
> out_err:
> st33zp24_cancel(chip);
> release_locality(chip);
>diff --git a/drivers/char/tpm/tpm_atmel.c b/drivers/char/tpm/tpm_atmel.c
>index 66a14526aaf4..a290b30a0c35 100644
>--- a/drivers/char/tpm/tpm_atmel.c
>+++ b/drivers/char/tpm/tpm_atmel.c
>@@ -105,7 +105,7 @@ static int tpm_atml_send(struct tpm_chip *chip, u8 *buf, size_t count)
> iowrite8(buf[i], priv->iobase);
> }
>
>- return count;
>+ return 0;
> }
>
> static void tpm_atml_cancel(struct tpm_chip *chip)
>diff --git a/drivers/char/tpm/tpm_i2c_atmel.c b/drivers/char/tpm/tpm_i2c_atmel.c
>index 4720b2442ffe..aa11c8a1df5e 100644
>--- a/drivers/char/tpm/tpm_i2c_atmel.c
>+++ b/drivers/char/tpm/tpm_i2c_atmel.c
>@@ -65,7 +65,11 @@ static int i2c_atmel_send(struct tpm_chip *chip, u8 *buf, size_t len)
> dev_dbg(&chip->dev,
> "%s(buf=%*ph len=%0zx) -> sts=%d\n", __func__,
> (int)min_t(size_t, 64, len), buf, len, status);
>- return status;
>+
>+ if (status < 0)
>+ return status;
>+
>+ return 0;
> }
>
> static int i2c_atmel_recv(struct tpm_chip *chip, u8 *buf, size_t count)
>diff --git a/drivers/char/tpm/tpm_i2c_infineon.c b/drivers/char/tpm/tpm_i2c_infineon.c
>index 3b490d9d90e7..3b4e9672ff6c 100644
>--- a/drivers/char/tpm/tpm_i2c_infineon.c
>+++ b/drivers/char/tpm/tpm_i2c_infineon.c
>@@ -588,7 +588,7 @@ static int tpm_tis_i2c_send(struct tpm_chip *chip, u8 *buf, size_t len)
> /* go and do it */
> iic_tpm_write(TPM_STS(tpm_dev.locality), &sts, 1);
>
>- return len;
>+ return 0;
> out_err:
> tpm_tis_i2c_ready(chip);
> /* The TPM needs some time to clean up here,
>diff --git a/drivers/char/tpm/tpm_i2c_nuvoton.c b/drivers/char/tpm/tpm_i2c_nuvoton.c
>index 5700cc2ddee1..315a3b4548f7 100644
>--- a/drivers/char/tpm/tpm_i2c_nuvoton.c
>+++ b/drivers/char/tpm/tpm_i2c_nuvoton.c
>@@ -465,7 +465,7 @@ static int i2c_nuvoton_send(struct tpm_chip *chip, u8 *buf, size_t len)
> }
>
> dev_dbg(dev, "%s() -> %zd\n", __func__, len);
>- return len;
>+ return 0;
> }
>
> static bool i2c_nuvoton_req_canceled(struct tpm_chip *chip, u8 status)
>diff --git a/drivers/char/tpm/tpm_ibmvtpm.c b/drivers/char/tpm/tpm_ibmvtpm.c
>index 07b5a487d0c8..757ca45b39b8 100644
>--- a/drivers/char/tpm/tpm_ibmvtpm.c
>+++ b/drivers/char/tpm/tpm_ibmvtpm.c
>@@ -139,14 +139,14 @@ static int tpm_ibmvtpm_recv(struct tpm_chip *chip, u8 *buf, size_t count)
> }
>
> /**
>- * tpm_ibmvtpm_send - Send tpm request
>- *
>+ * tpm_ibmvtpm_send() - Send a TPM command
> * @chip: tpm chip struct
> * @buf: buffer contains data to send
> * @count: size of buffer
> *
> * Return:
>- * Number of bytes sent or < 0 on error.
>+ * 0 on success,
>+ * -errno on error
> */
> static int tpm_ibmvtpm_send(struct tpm_chip *chip, u8 *buf, size_t count)
> {
>@@ -192,7 +192,7 @@ static int tpm_ibmvtpm_send(struct tpm_chip *chip, u8 *buf, size_t count)
> rc = 0;
> ibmvtpm->tpm_processing_cmd = false;
> } else
>- rc = count;
>+ rc = 0;
>
> spin_unlock(&ibmvtpm->rtce_lock);
> return rc;
>diff --git a/drivers/char/tpm/tpm_infineon.c b/drivers/char/tpm/tpm_infineon.c
>index d8f10047fbba..97f6d4fe0aee 100644
>--- a/drivers/char/tpm/tpm_infineon.c
>+++ b/drivers/char/tpm/tpm_infineon.c
>@@ -354,7 +354,7 @@ static int tpm_inf_send(struct tpm_chip *chip, u8 * buf, size_t count)
> for (i = 0; i < count; i++) {
> wait_and_send(chip, buf[i]);
> }
>- return count;
>+ return 0;
> }
>
> static void tpm_inf_cancel(struct tpm_chip *chip)
>diff --git a/drivers/char/tpm/tpm_nsc.c b/drivers/char/tpm/tpm_nsc.c
>index 5d6cce74cd3f..9bee3c5eb4bf 100644
>--- a/drivers/char/tpm/tpm_nsc.c
>+++ b/drivers/char/tpm/tpm_nsc.c
>@@ -226,7 +226,7 @@ static int tpm_nsc_send(struct tpm_chip *chip, u8 * buf, size_t count)
> }
> outb(NSC_COMMAND_EOC, priv->base + NSC_COMMAND);
>
>- return count;
>+ return 0;
> }
>
> static void tpm_nsc_cancel(struct tpm_chip *chip)
>diff --git a/drivers/char/tpm/tpm_tis_core.c b/drivers/char/tpm/tpm_tis_core.c
>index 60e2038652b8..b9f64684c3fb 100644
>--- a/drivers/char/tpm/tpm_tis_core.c
>+++ b/drivers/char/tpm/tpm_tis_core.c
>@@ -481,7 +481,7 @@ static int tpm_tis_send_main(struct tpm_chip *chip, const u8 *buf, size_t len)
> goto out_err;
> }
> }
>- return len;
>+ return 0;
> out_err:
> tpm_tis_ready(chip);
> return rc;
>diff --git a/drivers/char/tpm/tpm_vtpm_proxy.c b/drivers/char/tpm/tpm_vtpm_proxy.c
>index 26a2be555288..d74f3de74ae6 100644
>--- a/drivers/char/tpm/tpm_vtpm_proxy.c
>+++ b/drivers/char/tpm/tpm_vtpm_proxy.c
>@@ -335,7 +335,6 @@ static int vtpm_proxy_is_driver_command(struct tpm_chip *chip,
> static int vtpm_proxy_tpm_op_send(struct tpm_chip *chip, u8 *buf, size_t count)
> {
> struct proxy_dev *proxy_dev = dev_get_drvdata(&chip->dev);
>- int rc = 0;
>
> if (count > sizeof(proxy_dev->buffer)) {
> dev_err(&chip->dev,
>@@ -366,7 +365,7 @@ static int vtpm_proxy_tpm_op_send(struct tpm_chip *chip, u8 *buf, size_t count)
>
> wake_up_interruptible(&proxy_dev->wq);
>
>- return rc;
>+ return 0;
> }
>
> static void vtpm_proxy_tpm_op_cancel(struct tpm_chip *chip)
>diff --git a/drivers/char/tpm/xen-tpmfront.c b/drivers/char/tpm/xen-tpmfront.c
>index 1259e935fd58..4e2d00cb0d81 100644
>--- a/drivers/char/tpm/xen-tpmfront.c
>+++ b/drivers/char/tpm/xen-tpmfront.c
>@@ -173,7 +173,7 @@ static int vtpm_send(struct tpm_chip *chip, u8 *buf, size_t count)
> return -ETIME;
> }
>
>- return count;
>+ return 0;
> }
>
> static int vtpm_recv(struct tpm_chip *chip, u8 *buf, size_t count)
>--
>2.19.1
>
Does st33zp24_i2c_send need an update as well? It does 'return write8_reg()'.
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