linux-kernel - Re: [PATCH v3 2/2] mfd: intel-lpss: Amend IRQ check

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Date:   Thu, 23 Nov 2023 11:18:20 +0000
From:   Lee Jones <lee@...nel.org>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     Jarkko Nikula <jarkko.nikula@...ux.intel.com>,
        Chen Ni <nichen@...as.ac.cn>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 2/2] mfd: intel-lpss: Amend IRQ check

On Mon, 06 Nov 2023, Andy Shevchenko wrote:

> From: Chen Ni <nichen@...as.ac.cn>
> 
> platform_get_irq() returns a negative error code to indicating an
> error. All the same does pci_alloc_irq_vectors() and pci_irq_vector().
> So in intel_lpss_probe() the erroneous IRQ should be better returned
> as is.
> 
> The pci_alloc_irq_vectors() call and platform_get_irq() guarantee
> that IRQ won't be 0, hence drop that check.
> 
> Signed-off-by: Chen Ni <nichen@...as.ac.cn>
> [andy: updated commit message]

I reworded it further.

> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> ---
>  drivers/mfd/intel-lpss.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/mfd/intel-lpss.c b/drivers/mfd/intel-lpss.c
> index 9591b354072a..4c9d0222751a 100644
> --- a/drivers/mfd/intel-lpss.c
> +++ b/drivers/mfd/intel-lpss.c
> @@ -378,9 +378,12 @@ int intel_lpss_probe(struct device *dev,
>  	struct intel_lpss *lpss;
>  	int ret;
>  
> -	if (!info || !info->mem || info->irq <= 0)
> +	if (!info || !info->mem)
>  		return -EINVAL;
>  
> +	if (info->irq < 0)
> +		return info->irq;
> +
>  	lpss = devm_kzalloc(dev, sizeof(*lpss), GFP_KERNEL);
>  	if (!lpss)
>  		return -ENOMEM;
> -- 
> 2.40.0.1.gaa8946217a0b
> 

-- 
Lee Jones [李琼斯]