Re: [PATCH v3] char: tpm: move to use request_irq by IRQF_NO_AUTOEN flag

[Jarkko Sakkinen <jarkko@kernel.org>]

On Wed, May 19, 2021 at 02:49:59PM +0800, Tian Tao wrote:
> disable_irq() after request_irq() still has a time gap in which
> interrupts can come. request_irq() with IRQF_NO_AUTOEN flag will
> disable IRQ auto-enable because of requesting.
> 
> Link: https://lore.kernel.org/patchwork/patch/1388765/
> Signed-off-by: Tian Tao <tiantao6@hisilicon.com>
> ---
> v2: add the Link.
> v3: put sob last.
> ---
>  drivers/char/tpm/tpm_tis_i2c_cr50.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/char/tpm/tpm_tis_i2c_cr50.c b/drivers/char/tpm/tpm_tis_i2c_cr50.c
> index f19c227..44dde2f 100644
> --- a/drivers/char/tpm/tpm_tis_i2c_cr50.c
> +++ b/drivers/char/tpm/tpm_tis_i2c_cr50.c
> @@ -706,14 +706,14 @@ static int tpm_cr50_i2c_probe(struct i2c_client *client,
>  
>  	if (client->irq > 0) {
>  		rc = devm_request_irq(dev, client->irq, tpm_cr50_i2c_int_handler,
> -				      IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
> +				      IRQF_TRIGGER_FALLING | IRQF_ONESHOT |
> +				      IRQF_NO_AUTOEN,
>  				      dev->driver->name, chip);
>  		if (rc < 0) {
>  			dev_err(dev, "Failed to probe IRQ %d\n", client->irq);
>  			return rc;
>  		}
>  
> -		disable_irq(client->irq);
>  		priv->irq = client->irq;
>  	} else {
>  		dev_warn(dev, "No IRQ, will use %ums delay for TPM ready\n",
> -- 
> 2.7.4
> 
> 

How does this differ from

https://git.kernel.org/pub/scm/linux/kernel/git/jarkko/linux-tpmdd.git/commit/?id=da2f0c7b46171175ab54da248752b1139c42fee4
?

/Jarkko