linux-kernel - Re: [PATCH v4 05/17] platform: chrome: cros_ec: Do not attempt to register a non-positive IRQ number

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Date:   Sun, 10 Nov 2019 12:17:50 +0000
From:   Jonathan Cameron <jic23@...nel.org>
To:     Gwendal Grignou <gwendal@...omium.org>
Cc:     briannorris@...omium.org, knaack.h@....de, lars@...afoo.de,
        pmeerw@...erw.net, lee.jones@...aro.org, bleung@...omium.org,
        enric.balletbo@...labora.com, dianders@...omium.org,
        groeck@...omium.org, fabien.lahoudere@...labora.com,
        linux-kernel@...r.kernel.org, linux-iio@...r.kernel.org,
        Enrico Granata <egranata@...omium.org>
Subject: Re: [PATCH v4 05/17] platform: chrome: cros_ec: Do not attempt to
 register a non-positive IRQ number

On Tue,  5 Nov 2019 14:26:40 -0800
Gwendal Grignou <gwendal@...omium.org> wrote:

> Add a layer of sanity checking to cros_ec_register against attempting to
> register IRQ values that are not strictly greater than 0.
> 
> Signed-off-by: Enrico Granata <egranata@...omium.org>
> Signed-off-by: Gwendal Grignou <gwendal@...omium.org>

This strikes me as something that could be a potential fix to backport?
Any known cases of a negative irq getting to here or is this a by
inspection thing?

Otherwise seems obviously correct.
Acked-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>

Jonathan

> ---
> No changes in v4, v3.
> Changes in v2:
>   Remove dual Enrico's signature.
> 
>  drivers/platform/chrome/cros_ec.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/platform/chrome/cros_ec.c b/drivers/platform/chrome/cros_ec.c
> index 925f84dbf621..d3dfa27171e6 100644
> --- a/drivers/platform/chrome/cros_ec.c
> +++ b/drivers/platform/chrome/cros_ec.c
> @@ -149,7 +149,7 @@ int cros_ec_register(struct cros_ec_device *ec_dev)
>  		return err;
>  	}
>  
> -	if (ec_dev->irq) {
> +	if (ec_dev->irq > 0) {
>  		err = devm_request_threaded_irq(dev, ec_dev->irq,
>  						ec_irq_handler,
>  						ec_irq_thread,