[PATCH 20/22] usb: host: xhci-mtk: deny IRQ0

[Chunfeng Yun]

On Mon, 2021-10-18 at 21:39 +0300, Sergey Shtylyov wrote:
> If platform_get_irq() returns IRQ0 (considered invalid according to
> Linus)
> the driver blithely passes it to usb_add_hcd() that treats IRQ0 as no
> IRQ
> at all. Deny IRQ0 right away, returning -EINVAL from the probe()
> method...
> 
> Fixes: 0cbd4b34cda9 ("xhci: mediatek: support MTK xHCI host
> controller")
Fixes the following patch:

04284eb74e0c usb: xhci-mtk: add support runtime PM

It introduced the 'host' irq

> Signed-off-by: Sergey Shtylyov <s.shtylyov at omp.ru>
> ---
>  drivers/usb/host/xhci-mtk.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/usb/host/xhci-mtk.c b/drivers/usb/host/xhci-
> mtk.c
> index c53f6f276d5c..d2dc8d9863ee 100644
> --- a/drivers/usb/host/xhci-mtk.c
> +++ b/drivers/usb/host/xhci-mtk.c
> @@ -495,7 +495,7 @@ static int xhci_mtk_probe(struct platform_device
> *pdev)
>  		return ret;
>  
>  	irq = platform_get_irq_byname_optional(pdev, "host");
> -	if (irq < 0) {
> +	if (irq <= 0) {
>  		if (irq == -EPROBE_DEFER)
>  			return irq;
>  
> @@ -503,6 +503,8 @@ static int xhci_mtk_probe(struct platform_device
> *pdev)
>  		irq = platform_get_irq(pdev, 0);
>  		if (irq < 0)
>  			return irq;
> +		if (!irq)
if (irq <= 0) ?

Thanks

> +			return -EINVAL;
>  	}
>  
>  	wakeup_irq = platform_get_irq_byname_optional(pdev, "wakeup");