diff mbox series

[v10,04/14] tpm, tpm_tis: Do not skip reset of original interrupt vector

Message ID 20221120133134.28926-5-LinoSanfilippo@gmx.de (mailing list archive)
State New
Headers show
Series TPM IRQ fixes | expand

Commit Message

Lino Sanfilippo Nov. 20, 2022, 1:31 p.m. UTC
From: Lino Sanfilippo <l.sanfilippo@kunbus.com>

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 <l.sanfilippo@kunbus.com>
---
 drivers/char/tpm/tpm_tis_core.c | 33 +++++++++++++--------------------
 1 file changed, 13 insertions(+), 20 deletions(-)

Comments

Jarkko Sakkinen Nov. 24, 2022, 6:58 a.m. UTC | #1
On Sun, Nov 20, 2022 at 02:31:24PM +0100, Lino Sanfilippo wrote:
> From: Lino Sanfilippo <l.sanfilippo@kunbus.com>
> 
> 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 <l.sanfilippo@kunbus.com>
> ---
>  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
Lino Sanfilippo Nov. 24, 2022, 1:25 p.m. UTC | #2
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 <l.sanfilippo@kunbus.com>
>>
>> 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 <l.sanfilippo@kunbus.com>
>> ---
>>  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
diff mbox series

Patch

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;