linux-kernel - Re: [PATCH] of/irq: handle irq_of_parse_and

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Message-ID: <90924209-888d-4ff3-8f60-f82a073bcf1c@csgroup.eu>
Date: Tue, 3 Sep 2024 18:56:41 +0200
From: Christophe Leroy <christophe.leroy@...roup.eu>
To: Ma Ke <make24@...as.ac.cn>, jochen@...am.de, andi.shyti@...nel.org,
 grant.likely@...aro.org, thierry.reding@...il.com, rob.herring@...xeda.com
Cc: linuxppc-dev@...ts.ozlabs.org, linux-i2c@...r.kernel.org,
 linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH] of/irq: handle irq_of_parse_and_map() errors



Le 30/08/2024 à 16:21, Ma Ke a écrit :
> Zero and negative number is not a valid IRQ for in-kernel code and the
> irq_of_parse_and_map() function returns zero on error.  So this check for
> valid IRQs should only accept values > 0.

unsigned int irq_of_parse_and_map(struct device_node *node, int index);

I can't see how an 'unsigned int' can be negative.

Christophe

> 
> Cc: stable@...r.kernel.org
> Fixes: f7578496a671 ("of/irq: Use irq_of_parse_and_map()")
> Signed-off-by: Ma Ke <make24@...as.ac.cn>
> ---
>   drivers/i2c/busses/i2c-cpm.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/i2c/busses/i2c-cpm.c b/drivers/i2c/busses/i2c-cpm.c
> index 4794ec066eb0..41e3c95c0ef7 100644
> --- a/drivers/i2c/busses/i2c-cpm.c
> +++ b/drivers/i2c/busses/i2c-cpm.c
> @@ -435,7 +435,7 @@ static int cpm_i2c_setup(struct cpm_i2c *cpm)
>   	init_waitqueue_head(&cpm->i2c_wait);
>   
>   	cpm->irq = irq_of_parse_and_map(ofdev->dev.of_node, 0);
> -	if (!cpm->irq)
> +	if (cpm->irq <= 0)
>   		return -EINVAL;
>   
>   	/* Install interrupt handler. */