Messages in this thread | | | Subject | Re: [PATCH 1/2] tpm: Unify the send callback behaviour | From | Stefan Berger <> | Date | Fri, 8 Feb 2019 09:42:16 -0500 |
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On 2/8/19 9:05 AM, 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@vger.kernel.org > Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.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 | 2 +- > drivers/char/tpm/tpm_vtpm_proxy.c | 3 +-- > drivers/char/tpm/xen-tpmfront.c | 2 +-
At least tpm_nsc_send (tpm_nsc.c) and tpm_inf_send (tpm_infineon.c) are also returning the number of bytes sent. I would consider tpm_crb the outlier that returns 0 and should return the length even though we don't need it...
> 8 files changed, 12 insertions(+), 9 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..aeae3222723c 100644 > --- a/drivers/char/tpm/tpm_ibmvtpm.c > +++ b/drivers/char/tpm/tpm_ibmvtpm.c > @@ -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_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)
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