From: Lino Sanfilippo <[email protected]>
If in tpm_tis_probe_irq_single() an error occurs after the original
interrupt vector has been read, restore the interrupts before the error is
returned.
Since the caller does not check the error value, return -1 in any case that
the TPM_CHIP_FLAG_IRQ flag is not set. Since the return value of function
tpm_tis_gen_interrupt() is not longer used, make it a void function.
Fixes: 1107d065fdf1 ("tpm_tis: Introduce intermediate layer for TPM access")
Signed-off-by: Lino Sanfilippo <[email protected]>
---
drivers/char/tpm/tpm_tis_core.c | 33 +++++++++++++--------------------
1 file changed, 13 insertions(+), 20 deletions(-)
diff --git a/drivers/char/tpm/tpm_tis_core.c b/drivers/char/tpm/tpm_tis_core.c
index 603b82ca56da..1eac1279594d 100644
--- a/drivers/char/tpm/tpm_tis_core.c
+++ b/drivers/char/tpm/tpm_tis_core.c
@@ -729,7 +729,7 @@ static irqreturn_t tis_int_handler(int dummy, void *dev_id)
return IRQ_HANDLED;
}
-static int tpm_tis_gen_interrupt(struct tpm_chip *chip)
+static void tpm_tis_gen_interrupt(struct tpm_chip *chip)
{
const char *desc = "attempting to generate an interrupt";
u32 cap2;
@@ -738,16 +738,14 @@ static int tpm_tis_gen_interrupt(struct tpm_chip *chip)
ret = request_locality(chip, 0);
if (ret < 0)
- return ret;
+ return;
if (chip->flags & TPM_CHIP_FLAG_TPM2)
- ret = tpm2_get_tpm_pt(chip, 0x100, &cap2, desc);
+ tpm2_get_tpm_pt(chip, 0x100, &cap2, desc);
else
- ret = tpm1_getcap(chip, TPM_CAP_PROP_TIS_TIMEOUT, &cap, desc, 0);
+ tpm1_getcap(chip, TPM_CAP_PROP_TIS_TIMEOUT, &cap, desc, 0);
release_locality(chip, 0);
-
- return ret;
}
/* Register the IRQ and issue a command that will cause an interrupt. If an
@@ -777,42 +775,37 @@ static int tpm_tis_probe_irq_single(struct tpm_chip *chip, u32 intmask,
rc = tpm_tis_write8(priv, TPM_INT_VECTOR(priv->locality), irq);
if (rc < 0)
- return rc;
+ goto restore_irqs;
rc = tpm_tis_read32(priv, TPM_INT_STATUS(priv->locality), &int_status);
if (rc < 0)
- return rc;
+ goto restore_irqs;
/* Clear all existing */
rc = tpm_tis_write32(priv, TPM_INT_STATUS(priv->locality), int_status);
if (rc < 0)
- return rc;
-
+ goto restore_irqs;
/* Turn on */
rc = tpm_tis_write32(priv, TPM_INT_ENABLE(priv->locality),
intmask | TPM_GLOBAL_INT_ENABLE);
if (rc < 0)
- return rc;
+ goto restore_irqs;
clear_bit(TPM_TIS_IRQ_TESTED, &priv->flags);
/* Generate an interrupt by having the core call through to
* tpm_tis_send
*/
- rc = tpm_tis_gen_interrupt(chip);
- if (rc < 0)
- return rc;
+ tpm_tis_gen_interrupt(chip);
+restore_irqs:
/* tpm_tis_send will either confirm the interrupt is working or it
* will call disable_irq which undoes all of the above.
*/
if (!(chip->flags & TPM_CHIP_FLAG_IRQ)) {
- rc = tpm_tis_write8(priv, original_int_vec,
- TPM_INT_VECTOR(priv->locality));
- if (rc < 0)
- return rc;
-
- return 1;
+ tpm_tis_write8(priv, original_int_vec,
+ TPM_INT_VECTOR(priv->locality));
+ return -1;
}
return 0;
--
2.36.1
On Sun, Nov 20, 2022 at 02:31:24PM +0100, Lino Sanfilippo wrote:
> From: Lino Sanfilippo <[email protected]>
>
> If in tpm_tis_probe_irq_single() an error occurs after the original
> interrupt vector has been read, restore the interrupts before the error is
> returned.
>
> Since the caller does not check the error value, return -1 in any case that
> the TPM_CHIP_FLAG_IRQ flag is not set. Since the return value of function
> tpm_tis_gen_interrupt() is not longer used, make it a void function.
>
> Fixes: 1107d065fdf1 ("tpm_tis: Introduce intermediate layer for TPM access")
> Signed-off-by: Lino Sanfilippo <[email protected]>
> ---
> drivers/char/tpm/tpm_tis_core.c | 33 +++++++++++++--------------------
> 1 file changed, 13 insertions(+), 20 deletions(-)
>
> diff --git a/drivers/char/tpm/tpm_tis_core.c b/drivers/char/tpm/tpm_tis_core.c
> index 603b82ca56da..1eac1279594d 100644
> --- a/drivers/char/tpm/tpm_tis_core.c
> +++ b/drivers/char/tpm/tpm_tis_core.c
> @@ -729,7 +729,7 @@ static irqreturn_t tis_int_handler(int dummy, void *dev_id)
> return IRQ_HANDLED;
> }
>
> -static int tpm_tis_gen_interrupt(struct tpm_chip *chip)
> +static void tpm_tis_gen_interrupt(struct tpm_chip *chip)
> {
> const char *desc = "attempting to generate an interrupt";
> u32 cap2;
> @@ -738,16 +738,14 @@ static int tpm_tis_gen_interrupt(struct tpm_chip *chip)
>
> ret = request_locality(chip, 0);
> if (ret < 0)
> - return ret;
> + return;
>
> if (chip->flags & TPM_CHIP_FLAG_TPM2)
> - ret = tpm2_get_tpm_pt(chip, 0x100, &cap2, desc);
> + tpm2_get_tpm_pt(chip, 0x100, &cap2, desc);
In a successive patch:
- tpm2_get_tpm_pt(chip, 0x100, &cap2, desc);
+ ret = tpm2_get_tpm_pt(chip, 0x100, &cap2, desc);
`
BR, Jarkko
On 24.11.22 at 07:58, Jarkko Sakkinen wrote:
> On Sun, Nov 20, 2022 at 02:31:24PM +0100, Lino Sanfilippo wrote:
>> From: Lino Sanfilippo <[email protected]>
>>
>> If in tpm_tis_probe_irq_single() an error occurs after the original
>> interrupt vector has been read, restore the interrupts before the error is
>> returned.
>>
>> Since the caller does not check the error value, return -1 in any case that
>> the TPM_CHIP_FLAG_IRQ flag is not set. Since the return value of function
>> tpm_tis_gen_interrupt() is not longer used, make it a void function.
>>
>> Fixes: 1107d065fdf1 ("tpm_tis: Introduce intermediate layer for TPM access")
>> Signed-off-by: Lino Sanfilippo <[email protected]>
>> ---
>> drivers/char/tpm/tpm_tis_core.c | 33 +++++++++++++--------------------
>> 1 file changed, 13 insertions(+), 20 deletions(-)
>>
>> diff --git a/drivers/char/tpm/tpm_tis_core.c b/drivers/char/tpm/tpm_tis_core.c
>> index 603b82ca56da..1eac1279594d 100644
>> --- a/drivers/char/tpm/tpm_tis_core.c
>> +++ b/drivers/char/tpm/tpm_tis_core.c
>> @@ -729,7 +729,7 @@ static irqreturn_t tis_int_handler(int dummy, void *dev_id)
>> return IRQ_HANDLED;
>> }
>>
>> -static int tpm_tis_gen_interrupt(struct tpm_chip *chip)
>> +static void tpm_tis_gen_interrupt(struct tpm_chip *chip)
>> {
>> const char *desc = "attempting to generate an interrupt";
>> u32 cap2;
>> @@ -738,16 +738,14 @@ static int tpm_tis_gen_interrupt(struct tpm_chip *chip)
>>
>> ret = request_locality(chip, 0);
>> if (ret < 0)
>> - return ret;
>> + return;
>>
>> if (chip->flags & TPM_CHIP_FLAG_TPM2)
>> - ret = tpm2_get_tpm_pt(chip, 0x100, &cap2, desc);
>> + tpm2_get_tpm_pt(chip, 0x100, &cap2, desc);
>
> In a successive patch:
>
> - tpm2_get_tpm_pt(chip, 0x100, &cap2, desc);
> + ret = tpm2_get_tpm_pt(chip, 0x100, &cap2, desc);
> `
>
> BR, Jarkko
>
If it was a single patch it would be IMHO correct to remove ret, since at this point it
is not needed any more. But as part of a series it is admittedly a bit odd to remove the value only
to re-add it in a later patch of the same series. I will fix this and send a v11.
Regards,
Lino