linux-kernel - Re: [PATCH 1/1] usb: return error code when platform_get

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Date:   Wed, 30 Nov 2016 14:41:23 +0100
From:   Matthias Brugger <matthias.bgg@...il.com>
To:     Pan Bian <bianpan2016@....com>, linux-usb@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Mathias Nyman <mathias.nyman@...el.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "moderated list:ARM/Mediatek SoC..." 
        <linux-mediatek@...ts.infradead.org>,
        Chunfeng Yun <chunfeng.yun@...iatek.com>
Cc:     linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] usb: return error code when platform_get_irq fails



On 29/11/16 13:57, Pan Bian wrote:
> In function xhci_mtk_probe(), variable ret takes the return value. Its
> value should be negative on failures. However, when the call to function
> platform_get_irq() fails, it does not set the error code, and 0 will be
> returned. 0 indicates no error. As a result, the callers of function
> xhci_mtk_probe() will not be able to detect the error. This patch fixes
> the bug by assigning the return value of platform_get_irq() to variable
> ret if it fails.
>
> Signed-off-by: Pan Bian <bianpan2016@....com>
> ---
>  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 79959f1..f2365a4 100644
> --- a/drivers/usb/host/xhci-mtk.c
> +++ b/drivers/usb/host/xhci-mtk.c
> @@ -560,8 +560,10 @@ static int xhci_mtk_probe(struct platform_device *pdev)
>  		goto disable_ldos;
>
>  	irq = platform_get_irq(pdev, 0);
> -	if (irq < 0)
> +	if (irq < 0) {
> +		ret = irq;
>  		goto disable_clk;
> +	}
>
>  	/* Initialize dma_mask and coherent_dma_mask to 32-bits */
>  	ret = dma_set_coherent_mask(dev, DMA_BIT_MASK(32));
>


Reviewed-by: Matthias Brugger <matthias.bgg@...il.com>

Next time please make sure to send the patch to all relevant lists and 
people (get_maintainer.pl).

Regards,
Matthias