linux-kernel - Re: [PATCH 1/2] tpm_tis: Disable interrupt auto probing on a per-device basis

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Message-ID: <20151201071743.GP10431@pengutronix.de>
Date:	Tue, 1 Dec 2015 08:17:43 +0100
From:	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>
To:	Jason Gunthorpe <jgunthorpe@...idianresearch.com>
Cc:	Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>,
	tpmdd-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org,
	Martin Wilck <Martin.Wilck@...fujitsu.com>,
	Peter Huewe <peterhuewe@....de>
Subject: Re: [PATCH 1/2] tpm_tis: Disable interrupt auto probing on a
 per-device basis

Hello Jason,

On Mon, Nov 30, 2015 at 12:27:11PM -0700, Jason Gunthorpe wrote:
> Instead of clearing the global interrupts flag when any device
> does not have an interrupt just pass -1 through tpm_info.irq.

Is there a reason not to use 0 for the invalid irq?

> The only thing that asks for autoprobing is the force=1 path.
> 
> Signed-off-by: Jason Gunthorpe <jgunthorpe@...idianresearch.com>
> ---
>  drivers/char/tpm/tpm_tis.c | 16 +++++++---------
>  1 file changed, 7 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/char/tpm/tpm_tis.c b/drivers/char/tpm/tpm_tis.c
> index 8a3509cb10da..0a2d94f3d679 100644
> --- a/drivers/char/tpm/tpm_tis.c
> +++ b/drivers/char/tpm/tpm_tis.c
> @@ -69,7 +69,7 @@ enum tis_defaults {
>  struct tpm_info {
>  	unsigned long start;
>  	unsigned long len;
> -	unsigned int irq;
> +	int irq;
>  };
>  
>  static struct tpm_info tis_default_info = {
> @@ -807,7 +807,7 @@ static int tpm_tis_init(struct device *dev, struct tpm_info *tpm_info,
>  	/* INTERRUPT Setup */
>  	init_waitqueue_head(&chip->vendor.read_queue);
>  	init_waitqueue_head(&chip->vendor.int_queue);
> -	if (interrupts) {
> +	if (interrupts && tpm_info->irq != -1) {
>  		if (tpm_info->irq) {

There is even a check for irq == 0 that could be reused maybe?

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
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