linux-kernel - Re: [PATCH v2] usb: xhci: remove the code build warning

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Date:   Mon, 11 Jun 2018 20:30:27 +0800
From:   gengdongjiu <gengdongjiu@...wei.com>
To:     <mathias.nyman@...el.com>, <gregkh@...uxfoundation.org>,
        <thierry.reding@...il.com>, <jonathanh@...dia.com>,
        <linux-usb@...r.kernel.org>, <linux-tegra@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] usb: xhci: remove the code build warning

Hi Mathias,
   This patch is ready to apply, It is great that this patch can be applied to 4.18. thanks a lot.

On 2018/6/6 22:36, Dongjiu Geng wrote:
> Initialize the 'err' variate to remove the build warning,
> the warning is shown as below:
> 
> drivers/usb/host/xhci-tegra.c: In function 'tegra_xusb_mbox_thread':
> drivers/usb/host/xhci-tegra.c:552:6: warning: 'err' may be used uninitialized in this function [-Wuninitialized]
> drivers/usb/host/xhci-tegra.c:482:6: note: 'err' was declared here
> 
> Signed-off-by: Dongjiu Geng <gengdongjiu@...wei.com>
> Acked-by: Thierry Reding <treding@...dia.com>
> ---
> How to reproduce:
> 1. make defconfig ARCH=arm
> 2. make -j100 CROSS_COMPILE=arm-linux-gnueabi- ARCH=arm
> 
> Then you can see below warnings:
> drivers/usb/host/xhci-tegra.c: In function 'tegra_xusb_mbox_thread':
> drivers/usb/host/xhci-tegra.c:552:6: warning: 'err' may be used uninitialized in this function [-Wuninitialized]
> drivers/usb/host/xhci-tegra.c:482:6: note: 'err' was declared here
> ---
>  drivers/usb/host/xhci-tegra.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/usb/host/xhci-tegra.c b/drivers/usb/host/xhci-tegra.c
> index a8c1d07..d50549f 100644
> --- a/drivers/usb/host/xhci-tegra.c
> +++ b/drivers/usb/host/xhci-tegra.c
> @@ -481,7 +481,7 @@ static void tegra_xusb_mbox_handle(struct tegra_xusb *tegra,
>  	unsigned long mask;
>  	unsigned int port;
>  	bool idle, enable;
> -	int err;
> +	int err = 0;
>  
>  	memset(&rsp, 0, sizeof(rsp));
>  
>