linux-kernel - Re: [PATCH v2] tpm/tpm_tis: Free IRQ if probing fails

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Message-ID: <fa25cd78-2535-d26d-dd66-d64111af857a@redhat.com>
Date:   Tue, 21 Apr 2020 15:23:19 +0200
From:   Hans de Goede <hdegoede@...hat.com>
To:     Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>,
        linux-integrity@...r.kernel.org
Cc:     stable@...r.kernel.org, Peter Huewe <peterhuewe@....de>,
        Jason Gunthorpe <jgg@...pe.ca>, Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] tpm/tpm_tis: Free IRQ if probing fails

Hi,

On 4/16/20 6:07 PM, Jarkko Sakkinen wrote:
> Call disable_interrupts() if we have to revert to polling in order not to
> unnecessarily reserve the IRQ for the life-cycle of the driver.
> 
> Cc: stable@...r.kernel.org # 4.5.x
> Reported-by: Hans de Goede <hdegoede@...hat.com>
> Fixes: e3837e74a06d ("tpm_tis: Refactor the interrupt setup")
> Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>

I can confirm that this fixes the "irq 31 nobody cared" oops for me:

Tested-by: Hans de Goede <hdegoede@...hat.com>

Regards,

Hans




> ---
>   drivers/char/tpm/tpm_tis_core.c | 8 +++++++-
>   1 file changed, 7 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/char/tpm/tpm_tis_core.c b/drivers/char/tpm/tpm_tis_core.c
> index 27c6ca031e23..2435216bd10a 100644
> --- a/drivers/char/tpm/tpm_tis_core.c
> +++ b/drivers/char/tpm/tpm_tis_core.c
> @@ -433,6 +433,9 @@ static void disable_interrupts(struct tpm_chip *chip)
>   	u32 intmask;
>   	int rc;
>   
> +	if (priv->irq == 0)
> +		return;
> +
>   	rc = tpm_tis_read32(priv, TPM_INT_ENABLE(priv->locality), &intmask);
>   	if (rc < 0)
>   		intmask = 0;
> @@ -1062,9 +1065,12 @@ int tpm_tis_core_init(struct device *dev, struct tpm_tis_data *priv, int irq,
>   		if (irq) {
>   			tpm_tis_probe_irq_single(chip, intmask, IRQF_SHARED,
>   						 irq);
> -			if (!(chip->flags & TPM_CHIP_FLAG_IRQ))
> +			if (!(chip->flags & TPM_CHIP_FLAG_IRQ)) {
>   				dev_err(&chip->dev, FW_BUG
>   					"TPM interrupt not working, polling instead\n");
> +
> +				disable_interrupts(chip);
> +			}
>   		} else {
>   			tpm_tis_probe_irq(chip, intmask);
>   		}
>